Increased warning levels to -Wall -Wextra, and fixed Xcode 7 beta issues

Summary:
@public

I've increased the warning levels in the OSS frameworks, which caught a bunch of minor issues. I also fixed some new errors in Xcode 7 relating to designated initializers and TLS security.

Test Plan:
* Test the sample apps and make sure they still work.
* Run tests.

Examples/2048/2048.xcodeproj/project.pbxproj

@@ -159,7 +159,7 @@
 		83CBB9F71A601CBA00E9B192 /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
-				LastUpgradeCheck = 0610;
+				LastUpgradeCheck = 0700;
 				ORGANIZATIONNAME = Facebook;
 			};
 			buildConfigurationList = 83CBB9FA1A601CBA00E9B192 /* Build configuration list for PBXProject "2048" */;
@@ -271,6 +271,7 @@
 					"/Users/sahrens/src/fbobjc-hg/Libraries/FBReactKit/js/react-native-github/Libraries/Animation/build/Debug-iphoneos",
 				);
 				OTHER_LDFLAGS = "-ObjC";
+				PRODUCT_BUNDLE_IDENTIFIER = "com.facebook.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = 2048;
 			};
 			name = Debug;
@@ -291,6 +292,7 @@
 					"/Users/sahrens/src/fbobjc-hg/Libraries/FBReactKit/js/react-native-github/Libraries/Animation/build/Debug-iphoneos",
 				);
 				OTHER_LDFLAGS = "-ObjC";
+				PRODUCT_BUNDLE_IDENTIFIER = "com.facebook.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = 2048;
 			};
 			name = Release;
@@ -315,6 +317,7 @@
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				COPY_PHASE_STRIP = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_TESTABILITY = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_DYNAMIC_NO_PIC = NO;
 				GCC_OPTIMIZATION_LEVEL = 0;

Examples/2048/2048/Info.plist

@@ -7,7 +7,7 @@
 	<key>CFBundleExecutable</key>
 	<string>$(EXECUTABLE_NAME)</string>
 	<key>CFBundleIdentifier</key>
-	<string>com.facebook.$(PRODUCT_NAME:rfc1034identifier)</string>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
 	<key>CFBundleInfoDictionaryVersion</key>
 	<string>6.0</string>
 	<key>CFBundleName</key>
@@ -22,6 +22,11 @@
 	<string>1</string>
 	<key>LSRequiresIPhoneOS</key>
 	<true/>
+	<key>NSAppTransportSecurity</key>
+	<dict>
+		<key>NSAllowsArbitraryLoads</key>
+		<true/>
+	</dict>
 	<key>UILaunchStoryboardName</key>
 	<string>LaunchScreen</string>
 	<key>UIRequiredDeviceCapabilities</key>

Examples/Movies/Movies/Info.plist

@@ -47,5 +47,11 @@
 	</array>
 	<key>UIViewControllerBasedStatusBarAppearance</key>
 	<false/>
+  <key>NSAppTransportSecurity</key>
+  <dict>
+    <!--See http://ste.vn/2015/06/10/configuring-app-transport-security-ios-9-osx-10-11/-->
+    <key>NSAllowsArbitraryLoads</key>
+    <true/>
+  </dict>
 </dict>
 </plist>

Examples/SampleApp/iOS/Info.plist

@@ -38,5 +38,11 @@
 	<false/>
 	<key>NSLocationWhenInUseUsageDescription</key>
 	<string></string>
+  <key>NSAppTransportSecurity</key>
+  <dict>
+    <!--See http://ste.vn/2015/06/10/configuring-app-transport-security-ios-9-osx-10-11/-->
+    <key>NSAllowsArbitraryLoads</key>
+    <true/>
+  </dict>
 </dict>
 </plist>

Examples/TicTacToe/TicTacToe.xcodeproj/project.pbxproj

@@ -159,7 +159,7 @@
 		83CBB9F71A601CBA00E9B192 /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
-				LastUpgradeCheck = 0610;
+				LastUpgradeCheck = 0700;
 				ORGANIZATIONNAME = Facebook;
 			};
 			buildConfigurationList = 83CBB9FA1A601CBA00E9B192 /* Build configuration list for PBXProject "TicTacToe" */;
@@ -268,6 +268,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				LIBRARY_SEARCH_PATHS = "$(inherited)";
 				OTHER_LDFLAGS = "-ObjC";
+				PRODUCT_BUNDLE_IDENTIFIER = "com.facebook.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = TicTacToe;
 			};
 			name = Debug;
@@ -285,6 +286,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				LIBRARY_SEARCH_PATHS = "$(inherited)";
 				OTHER_LDFLAGS = "-ObjC";
+				PRODUCT_BUNDLE_IDENTIFIER = "com.facebook.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = TicTacToe;
 			};
 			name = Release;
@@ -309,6 +311,7 @@
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				COPY_PHASE_STRIP = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_TESTABILITY = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_DYNAMIC_NO_PIC = NO;
 				GCC_OPTIMIZATION_LEVEL = 0;

Examples/TicTacToe/TicTacToe.xcodeproj/xcshareddata/xcschemes/TicTacToe.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0610"
+   LastUpgradeVersion = "0700"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -38,6 +38,8 @@
             ReferencedContainer = "container:TicTacToe.xcodeproj">
          </BuildableReference>
       </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
    </TestAction>
    <LaunchAction
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
@@ -47,8 +49,10 @@
       buildConfiguration = "Debug"
       ignoresPersistentStateOnLaunch = "NO"
       debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
       allowLocationSimulation = "YES">
-      <BuildableProductRunnable>
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
          <BuildableReference
             BuildableIdentifier = "primary"
             BlueprintIdentifier = "13B07F861A680F5B00A75B9A"
@@ -66,7 +70,8 @@
       useCustomWorkingDirectory = "NO"
       buildConfiguration = "Release"
       debugDocumentVersioning = "YES">
-      <BuildableProductRunnable>
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
          <BuildableReference
             BuildableIdentifier = "primary"
             BlueprintIdentifier = "13B07F861A680F5B00A75B9A"

Examples/TicTacToe/TicTacToe/Info.plist

@@ -7,7 +7,7 @@
 	<key>CFBundleExecutable</key>
 	<string>$(EXECUTABLE_NAME)</string>
 	<key>CFBundleIdentifier</key>
-	<string>com.facebook.$(PRODUCT_NAME:rfc1034identifier)</string>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
 	<key>CFBundleInfoDictionaryVersion</key>
 	<string>6.0</string>
 	<key>CFBundleName</key>
@@ -36,5 +36,11 @@
 	</array>
 	<key>UIViewControllerBasedStatusBarAppearance</key>
 	<false/>
+	<key>NSAppTransportSecurity</key>
+  <dict>
+    <!--See http://ste.vn/2015/06/10/configuring-app-transport-security-ios-9-osx-10-11/-->
+    <key>NSAllowsArbitraryLoads</key>
+    <true/>
+  </dict>
 </dict>
 </plist>

Examples/UIExplorer/UIExplorer.xcodeproj/project.pbxproj

@@ -560,7 +560,7 @@
 		83CBB9F71A601CBA00E9B192 /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
-				LastUpgradeCheck = 0610;
+				LastUpgradeCheck = 0700;
 				ORGANIZATIONNAME = Facebook;
 				TargetAttributes = {
 					004D289D1AAF61C70097A701 = {
@@ -850,6 +850,7 @@
 					XCTest,
 					"-ObjC",
 				);
+				PRODUCT_BUNDLE_IDENTIFIER = "com.facebook.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 			};
 			name = Debug;
@@ -879,6 +880,7 @@
 					XCTest,
 					"-ObjC",
 				);
+				PRODUCT_BUNDLE_IDENTIFIER = "com.facebook.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 			};
 			name = Release;
@@ -898,6 +900,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited)";
 				LIBRARY_SEARCH_PATHS = "$(inherited)";
 				OTHER_LDFLAGS = "-ObjC";
+				PRODUCT_BUNDLE_IDENTIFIER = com.facebook.internal.uiexplorer.local;
 				PRODUCT_NAME = UIExplorer;
 			};
 			name = Debug;
@@ -916,6 +919,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited)";
 				LIBRARY_SEARCH_PATHS = "$(inherited)";
 				OTHER_LDFLAGS = "-ObjC";
+				PRODUCT_BUNDLE_IDENTIFIER = com.facebook.internal.uiexplorer.local;
 				PRODUCT_NAME = UIExplorer;
 			};
 			name = Release;
@@ -943,6 +947,7 @@
 					XCTest,
 					"-ObjC",
 				);
+				PRODUCT_BUNDLE_IDENTIFIER = "com.facebook.React.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/UIExplorer.app/UIExplorer";
 			};
@@ -968,6 +973,7 @@
 					XCTest,
 					"-ObjC",
 				);
+				PRODUCT_BUNDLE_IDENTIFIER = "com.facebook.React.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/UIExplorer.app/UIExplorer";
 			};
@@ -981,18 +987,23 @@
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;
 				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_ASSIGN_ENUM = YES;
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_ATOMIC_PROPERTIES = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				COPY_PHASE_STRIP = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_TESTABILITY = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_DYNAMIC_NO_PIC = NO;
 				GCC_OPTIMIZATION_LEVEL = 0;
@@ -1002,10 +1013,16 @@
 				);
 				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_MISSING_NEWLINE = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
+				GCC_WARN_MULTIPLE_DEFINITION_TYPES_FOR_SELECTOR = YES;
+				GCC_WARN_STRICT_SELECTOR_MATCH = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNKNOWN_PRAGMAS = YES;
 				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_LABEL = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
 				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
@@ -1016,6 +1033,10 @@
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
+				WARNING_CFLAGS = (
+					"-Wextra",
+					"-Wall",
+				);
 			};
 			name = Debug;
 		};
@@ -1027,12 +1048,16 @@
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;
 				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_ASSIGN_ENUM = YES;
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_ATOMIC_PROPERTIES = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
@@ -1042,10 +1067,16 @@
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_MISSING_NEWLINE = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
+				GCC_WARN_MULTIPLE_DEFINITION_TYPES_FOR_SELECTOR = YES;
+				GCC_WARN_STRICT_SELECTOR_MATCH = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNKNOWN_PRAGMAS = YES;
 				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_LABEL = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
 				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
@@ -1056,6 +1087,10 @@
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				VALIDATE_PRODUCT = YES;
+				WARNING_CFLAGS = (
+					"-Wextra",
+					"-Wall",
+				);
 			};
 			name = Release;
 		};

Examples/UIExplorer/UIExplorer.xcodeproj/xcshareddata/xcschemes/UIExplorer.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0630"
+   LastUpgradeVersion = "0700"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -86,6 +86,8 @@
             ReferencedContainer = "container:UIExplorer.xcodeproj">
          </BuildableReference>
       </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
    </TestAction>
    <LaunchAction
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
@@ -95,6 +97,7 @@
       buildConfiguration = "Debug"
       ignoresPersistentStateOnLaunch = "NO"
       debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
       allowLocationSimulation = "YES">
       <BuildableProductRunnable
          runnableDebuggingMode = "0">

Examples/UIExplorer/UIExplorer/AppDelegate.m

@@ -18,7 +18,7 @@
 
 @implementation AppDelegate
 
-- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
+- (BOOL)application:(__unused UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
 {
   NSURL *jsCodeLocation;
 

Examples/UIExplorer/UIExplorer/Info.plist

@@ -7,7 +7,7 @@
 	<key>CFBundleExecutable</key>
 	<string>$(EXECUTABLE_NAME)</string>
 	<key>CFBundleIdentifier</key>
-	<string>com.facebook.internal.uiexplorer.local</string>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
 	<key>CFBundleInfoDictionaryVersion</key>
 	<string>6.0</string>
 	<key>CFBundleName</key>
@@ -38,5 +38,11 @@
 	</array>
 	<key>UIViewControllerBasedStatusBarAppearance</key>
 	<false/>
+	<key>NSAppTransportSecurity</key>
+  <dict>
+    <!--See http://ste.vn/2015/06/10/configuring-app-transport-security-ios-9-osx-10-11/-->
+    <key>NSAllowsArbitraryLoads</key>
+    <true/>
+  </dict>
 </dict>
 </plist>

Examples/UIExplorer/UIExplorerIntegrationTests/Info.plist

@@ -7,7 +7,7 @@
 	<key>CFBundleExecutable</key>
 	<string>$(EXECUTABLE_NAME)</string>
 	<key>CFBundleIdentifier</key>
-	<string>com.facebook.React.$(PRODUCT_NAME:rfc1034identifier)</string>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
 	<key>CFBundleInfoDictionaryVersion</key>
 	<string>6.0</string>
 	<key>CFBundleName</key>

Examples/UIExplorer/UIExplorerUnitTests/Info.plist

@@ -7,7 +7,7 @@
 	<key>CFBundleExecutable</key>
 	<string>$(EXECUTABLE_NAME)</string>
 	<key>CFBundleIdentifier</key>
-	<string>com.facebook.$(PRODUCT_NAME:rfc1034identifier)</string>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
 	<key>CFBundleInfoDictionaryVersion</key>
 	<string>6.0</string>
 	<key>CFBundleName</key>

Examples/UIExplorer/UIExplorerUnitTests/RCTAllocationTests.m

@@ -158,7 +158,9 @@ RCT_EXPORT_MODULE();
 
 - (void)testContentViewIsInvalidated
 {
-  RCTBridge *bridge = [[RCTBridge alloc] initWithBundleURL:nil moduleProvider:nil launchOptions:nil];
+  RCTBridge *bridge = [[RCTBridge alloc] initWithBundleURL:nil
+                                            moduleProvider:nil
+                                             launchOptions:nil];
   __weak id rootContentView;
   @autoreleasepool {
     RCTRootView *rootView = [[RCTRootView alloc] initWithBridge:bridge moduleName:@""];

Examples/UIExplorer/UIExplorerUnitTests/RCTBridgeTests.m

@@ -42,17 +42,17 @@ RCT_EXPORT_MODULE()
   return YES;
 }
 
-- (void)executeJSCall:(NSString *)name
+- (void)executeJSCall:(__unused NSString *)name
-               method:(NSString *)method
+               method:(__unused NSString *)method
-            arguments:(NSArray *)arguments
+            arguments:(__unused NSArray *)arguments
-              context:(NSNumber *)executorID
+              context:(__unused NSNumber *)executorID
              callback:(RCTJavaScriptCallback)onComplete
 {
   onComplete(nil, nil);
 }
 
-- (void)executeApplicationScript:(NSString *)script
+- (void)executeApplicationScript:(__unused NSString *)script
-                       sourceURL:(NSURL *)url
+                       sourceURL:(__unused NSURL *)url
                       onComplete:(RCTJavaScriptCompleteBlock)onComplete
 {
   onComplete(nil);

Examples/UIExplorer/UIExplorerUnitTests/RCTContextExecutorTests.m

@@ -30,7 +30,7 @@
   dispatch_semaphore_t doneSem = dispatch_semaphore_create(0);
   [_executor executeApplicationScript:@"var x = {toString: function() { throw 1; }}; nativeLoggingHook(x);"
                            sourceURL:[NSURL URLWithString:@"file://"]
-                          onComplete:^(id error){
+                          onComplete:^(__unused id error){
                             dispatch_semaphore_signal(doneSem);
                           }];
   dispatch_semaphore_wait(doneSem, DISPATCH_TIME_FOREVER);
@@ -39,7 +39,7 @@
 
 static uint64_t _get_time_nanoseconds(void)
 {
-  static struct mach_timebase_info tb_info = {0};
+  static struct mach_timebase_info tb_info = {0, 0};
   static dispatch_once_t onceToken;
   dispatch_once(&onceToken, ^{
     int ret = mach_timebase_info(&tb_info);
@@ -114,7 +114,7 @@ static uint64_t _get_time_nanoseconds(void)
     } \
   ";
 
-  [_executor executeApplicationScript:script sourceURL:[NSURL URLWithString:@"http://localhost:8081/"] onComplete:^(NSError *error) {
+  [_executor executeApplicationScript:script sourceURL:[NSURL URLWithString:@"http://localhost:8081/"] onComplete:^(__unused NSError *error) {
     NSMutableArray *params = [[NSMutableArray alloc] init];
     id data = @1;
     for (int i = 0; i < 4; i++) {
@@ -128,8 +128,8 @@ static uint64_t _get_time_nanoseconds(void)
                            method:@"method"
                         arguments:params
                           context:RCTGetExecutorID(_executor)
-                         callback:^(id json, NSError *__error) {
+                         callback:^(id json, __unused NSError *unused) {
-                           RCTAssert([json isEqual:@YES], @"Invalid return");
+                           XCTAssert([json isEqual:@YES], @"Invalid return");
                          }];
           double run = _get_time_nanoseconds() - start;
           if ((j % frequency) == frequency - 1) { // Warmup

Examples/UIExplorer/UIExplorerUnitTests/RCTConvert_NSURLTests.m

@@ -13,7 +13,7 @@
 #define TEST_URL(name, _input, _expectedURL) \
 - (void)test_##name { \
   NSURL *result = [RCTConvert NSURL:_input]; \
-  NSURL *expected = [NSURL URLWithString:_expectedURL]; \
+  NSURL *expected = (_expectedURL) ? [NSURL URLWithString:_expectedURL ?: @""] : nil; \
   XCTAssertEqualObjects(result.absoluteURL, expected); \
 } \
 

Examples/UIExplorer/UIExplorerUnitTests/RCTUIManagerTests.m

@@ -136,7 +136,7 @@
 
   // We need to keep these in array to keep them around
   NSMutableArray *viewsToRemove = [NSMutableArray array];
-  for (NSInteger i = 0; i < removeAtIndices.count; i++) {
+  for (NSUInteger i = 0; i < removeAtIndices.count; i++) {
     NSNumber *reactTagToRemove = @([removeAtIndices[i] integerValue] + 1);
     UIView *viewToRemove = _uiManager.viewRegistry[reactTagToRemove];
     [viewsToRemove addObject:viewToRemove];
@@ -160,7 +160,7 @@
                instead have the following subviews %@", [containerView reactSubviews]);
 
   NSArray *expectedReactTags = @[@11, @5, @1, @2, @7, @8, @12, @10];
-  for (NSInteger i = 0; i < [[containerView subviews] count]; i++) {
+  for (NSUInteger i = 0; i < containerView.subviews.count; i++) {
     XCTAssertEqualObjects([[containerView reactSubviews][i] reactTag], expectedReactTags[i],
                  @"Expected subview at index %ld to have react tag #%@ but has tag #%@",
                          (long)i, expectedReactTags[i], [[containerView reactSubviews][i] reactTag]);

Libraries/ActionSheetIOS/RCTActionSheet.xcodeproj/project.pbxproj

@@ -150,6 +150,7 @@
 				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
@@ -158,6 +159,10 @@
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
+				WARNING_CFLAGS = (
+					"-Wextra",
+					"-Wall",
+				);
 			};
 			name = Debug;
 		};
@@ -184,6 +189,7 @@
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
@@ -192,6 +198,10 @@
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				VALIDATE_PRODUCT = YES;
+				WARNING_CFLAGS = (
+					"-Wextra",
+					"-Wall",
+				);
 			};
 			name = Release;
 		};

Libraries/ActionSheetIOS/RCTActionSheetManager.m

@@ -37,7 +37,7 @@ RCT_EXPORT_MODULE()
 }
 
 RCT_EXPORT_METHOD(showActionSheetWithOptions:(NSDictionary *)options
-                  failureCallback:(RCTResponseSenderBlock)failureCallback
+                  failureCallback:(__unused RCTResponseSenderBlock)failureCallback
                   successCallback:(RCTResponseSenderBlock)successCallback)
 {
   UIActionSheet *actionSheet = [[UIActionSheet alloc] init];
@@ -86,19 +86,10 @@ RCT_EXPORT_METHOD(showShareActionSheetWithOptions:(NSDictionary *)options
   }
   UIActivityViewController *share = [[UIActivityViewController alloc] initWithActivityItems:items applicationActivities:nil];
   UIViewController *ctrl = [[[[UIApplication sharedApplication] delegate] window] rootViewController];
-  if ([share respondsToSelector:@selector(setCompletionWithItemsHandler:)]) {
-    share.completionWithItemsHandler = ^(NSString *activityType, BOOL completed, NSArray *returnedItems, NSError *activityError) {
-      if (activityError) {
-        failureCallback(@[[activityError localizedDescription]]);
-      } else {
-        successCallback(@[@(completed), RCTNullIfNil(activityType)]);
-      }
-    };
-  } else {
 
 #if __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_8_0
 
-    if (![UIActivityViewController instancesRespondToSelector:@selector(completionWithItemsHandler)]) {
+  if (![UIActivityViewController instancesRespondToSelector:@selector(setCompletionWithItemsHandler:)]) {
     // Legacy iOS 7 implementation
     share.completionHandler = ^(NSString *activityType, BOOL completed) {
       successCallback(@[@(completed), RCTNullIfNil(activityType)]);
@@ -109,11 +100,15 @@ RCT_EXPORT_METHOD(showShareActionSheetWithOptions:(NSDictionary *)options
 
   {
     // iOS 8 version
-      share.completionWithItemsHandler = ^(NSString *activityType, BOOL completed, NSArray *returnedItems, NSError *activityError) {
+    share.completionWithItemsHandler = ^(NSString *activityType, BOOL completed, __unused NSArray *returnedItems, NSError *activityError) {
+      if (activityError) {
+        failureCallback(@[RCTNullIfNil(activityError.localizedDescription)]);
+      } else {
         successCallback(@[@(completed), RCTNullIfNil(activityType)]);
+      }
     };
   }
-  }
+
   [ctrl presentViewController:share animated:YES completion:nil];
 }
 

Libraries/AdSupport/RCTAdSupport.xcodeproj/project.pbxproj

@@ -150,6 +150,7 @@
 				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
@@ -163,6 +164,10 @@
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
+				WARNING_CFLAGS = (
+					"-Werror",
+					"-Wall",
+				);
 			};
 			name = Debug;
 		};
@@ -189,6 +194,7 @@
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
@@ -202,6 +208,10 @@
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				VALIDATE_PRODUCT = YES;
+				WARNING_CFLAGS = (
+					"-Werror",
+					"-Wall",
+				);
 			};
 			name = Release;
 		};

Libraries/Geolocation/RCTGeolocation.xcodeproj/project.pbxproj

@@ -150,6 +150,7 @@
 				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
@@ -158,6 +159,10 @@
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
+				WARNING_CFLAGS = (
+					"-Werror",
+					"-Wall",
+				);
 			};
 			name = Debug;
 		};
@@ -184,6 +189,7 @@
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
@@ -192,6 +198,10 @@
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				VALIDATE_PRODUCT = YES;
+				WARNING_CFLAGS = (
+					"-Werror",
+					"-Wall",
+				);
 			};
 			name = Release;
 		};

Libraries/Image/RCTImage.xcodeproj/project.pbxproj

@@ -198,6 +198,7 @@
 				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
@@ -206,6 +207,10 @@
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
+				WARNING_CFLAGS = (
+					"-Werror",
+					"-Wall",
+				);
 			};
 			name = Debug;
 		};
@@ -232,6 +237,7 @@
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
@@ -240,6 +246,10 @@
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				VALIDATE_PRODUCT = YES;
+				WARNING_CFLAGS = (
+					"-Werror",
+					"-Wall",
+				);
 			};
 			name = Release;
 		};

Libraries/Image/RCTNetworkImageView.h

@@ -13,8 +13,7 @@
 
 @interface RCTNetworkImageView : UIView
 
-- (instancetype)initWithFrame:(CGRect)frame
+- (instancetype)initWithImageDownloader:(RCTImageDownloader *)imageDownloader NS_DESIGNATED_INITIALIZER;
-              imageDownloader:(RCTImageDownloader *)imageDownloader NS_DESIGNATED_INITIALIZER;
 
 /**
  * An image that will appear while the view is loading the image from the network,

Libraries/Image/RCTNetworkImageView.m

@@ -9,6 +9,7 @@
 
 #import "RCTNetworkImageView.h"
 
+#import "RCTAssert.h"
 #import "RCTConvert.h"
 #import "RCTGIFImage.h"
 #import "RCTImageDownloader.h"
@@ -25,16 +26,22 @@
   id _downloadToken;
 }
 
-- (instancetype)initWithFrame:(CGRect)frame imageDownloader:(RCTImageDownloader *)imageDownloader
+- (instancetype)initWithImageDownloader:(RCTImageDownloader *)imageDownloader
 {
-  if ((self = [super initWithFrame:frame])) {
+  RCTAssertParam(imageDownloader);
+
+  if ((self = [super initWithFrame:CGRectZero])) {
     _deferSentinel = 0;
     _imageDownloader = imageDownloader;
     self.userInteractionEnabled = NO;
+    self.contentMode = UIViewContentModeScaleAspectFill;
   }
   return self;
 }
 
+RCT_NOT_IMPLEMENTED(-initWithFrame:(CGRect)frame)
+RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
+
 - (NSURL *)imageURL
 {
   // We clear our imageURL when we are not in a window for a while,

Libraries/Image/RCTNetworkImageViewManager.m

@@ -22,9 +22,7 @@ RCT_EXPORT_MODULE()
 
 - (UIView *)view
 {
-  RCTNetworkImageView *view = [[RCTNetworkImageView alloc] initWithFrame:CGRectZero imageDownloader:[RCTImageDownloader sharedInstance]];
+  return [[RCTNetworkImageView alloc] initWithImageDownloader:[RCTImageDownloader sharedInstance]];
-  view.contentMode = UIViewContentModeScaleAspectFill;
-  return view;
 }
 
 RCT_REMAP_VIEW_PROPERTY(defaultImageSrc, defaultImage, UIImage)

Libraries/Network/RCTDataManager.m

@@ -164,6 +164,10 @@ typedef void (^RCTDataLoaderCallback)(NSData *data, NSString *MIMEType, NSError
                         handler:(id<RCTURLRequestHandler>)handler
                        callback:(RCTDataLoaderCallback)callback
 {
+   RCTAssertParam(request);
+   RCTAssertParam(handler);
+   RCTAssertParam(callback);
+
   if ((self = [super init])) {
     _callback = callback;
     _request = [[RCTActiveURLRequest alloc] init];
@@ -175,6 +179,11 @@ typedef void (^RCTDataLoaderCallback)(NSData *data, NSString *MIMEType, NSError
   return self;
 }
 
+- (instancetype)init
+{
+  return [self initWithRequest:nil handler:nil callback:nil];
+}
+
 - (void)URLRequest:(id)requestToken didReceiveResponse:(NSURLResponse *)response
 {
   RCTAssert([requestToken isEqual:_requestToken], @"Shouldn't ever happen");

Libraries/Network/RCTNetwork.xcodeproj/project.pbxproj

@@ -162,6 +162,7 @@
 				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
@@ -170,6 +171,10 @@
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
+				WARNING_CFLAGS = (
+					"-Werror",
+					"-Wall",
+				);
 			};
 			name = Debug;
 		};
@@ -196,6 +201,7 @@
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
@@ -204,6 +210,10 @@
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				VALIDATE_PRODUCT = YES;
+				WARNING_CFLAGS = (
+					"-Werror",
+					"-Wall",
+				);
 			};
 			name = Release;
 		};

Libraries/Network/RCTReachability.m

@@ -9,6 +9,7 @@
 
 #import "RCTReachability.h"
 
+#import "RCTAssert.h"
 #import "RCTBridge.h"
 #import "RCTEventDispatcher.h"
 
@@ -59,9 +60,12 @@ static void RCTReachabilityCallback(__unused SCNetworkReachabilityRef target, SC
 
 - (instancetype)initWithHost:(NSString *)host
 {
+  RCTAssertParam(host);
+  RCTAssert(![host hasPrefix:@"http"], @"Host value should just contain the domain, not the URL scheme.");
+
   if ((self = [super init])) {
     _status = RCTReachabilityStateUnknown;
-    _reachability = SCNetworkReachabilityCreateWithName(kCFAllocatorDefault, [host UTF8String]);
+    _reachability = SCNetworkReachabilityCreateWithName(kCFAllocatorDefault, host.UTF8String);
     SCNetworkReachabilityContext context = { 0, ( __bridge void *)self, NULL, NULL, NULL };
     SCNetworkReachabilitySetCallback(_reachability, RCTReachabilityCallback, &context);
     SCNetworkReachabilityScheduleWithRunLoop(_reachability, CFRunLoopGetMain(), kCFRunLoopCommonModes);

Libraries/PushNotificationIOS/RCTPushNotification.xcodeproj/project.pbxproj

@@ -147,6 +147,7 @@
 				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
@@ -155,6 +156,10 @@
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
+				WARNING_CFLAGS = (
+					"-Wextra",
+					"-Wall",
+				);
 			};
 			name = Debug;
 		};
@@ -182,6 +187,7 @@
 				GCC_PREPROCESSOR_DEFINITIONS = "";
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
@@ -190,6 +196,10 @@
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				VALIDATE_PRODUCT = YES;
+				WARNING_CFLAGS = (
+					"-Wextra",
+					"-Wall",
+				);
 			};
 			name = Release;
 		};

Libraries/PushNotificationIOS/RCTPushNotificationManager.m

@@ -61,18 +61,19 @@ RCT_EXPORT_MODULE()
   _initialNotification = [bridge.launchOptions[UIApplicationLaunchOptionsRemoteNotificationKey] copy];
 }
 
-+ (void)application:(UIApplication *)application didRegisterUserNotificationSettings:(UIUserNotificationSettings *)notificationSettings
++ (void)application:(__unused UIApplication *)application didRegisterUserNotificationSettings:(__unused UIUserNotificationSettings *)notificationSettings
 {
   if ([application respondsToSelector:@selector(registerForRemoteNotifications)]) {
     [application registerForRemoteNotifications];
   }
 }
 
-+ (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken
++ (void)application:(__unused UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken
 {
   NSMutableString *hexString = [NSMutableString string];
-  const unsigned char *bytes = [deviceToken bytes];
+  NSUInteger deviceTokenLength = deviceToken.length;
-  for (int i = 0; i < [deviceToken length]; i++) {
+  const unsigned char *bytes = deviceToken.bytes;
+  for (NSUInteger i = 0; i < deviceTokenLength; i++) {
     [hexString appendFormat:@"%02x", bytes[i]];
   }
   NSDictionary *userInfo = @{
@@ -83,7 +84,7 @@ RCT_EXPORT_MODULE()
                                                     userInfo:userInfo];
 }
 
-+ (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)notification
++ (void)application:(__unused UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)notification
 {
   [[NSNotificationCenter defaultCenter] postNotificationName:RCTRemoteNotificationReceived
                                                       object:self

Libraries/RCTTest/RCTTest.xcodeproj/project.pbxproj

@@ -188,6 +188,7 @@
 				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
@@ -201,6 +202,10 @@
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
+				WARNING_CFLAGS = (
+					"-Werror",
+					"-Wall",
+				);
 			};
 			name = Debug;
 		};
@@ -227,6 +232,7 @@
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
@@ -240,6 +246,10 @@
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				VALIDATE_PRODUCT = YES;
+				WARNING_CFLAGS = (
+					"-Werror",
+					"-Wall",
+				);
 			};
 			name = Release;
 		};

Libraries/RCTTest/RCTTestRunner.h

@@ -28,10 +28,10 @@
  * macro instead of calling this directly.
  *
  * @param app The path to the app bundle without suffixes, e.g. IntegrationTests/IntegrationTestsApp
- * @param referencesDir The path for snapshot references images. The RCTInitRunnerForApp macro uses
+ * @param referenceDir The path for snapshot references images. The RCTInitRunnerForApp macro uses
  *        FB_REFERENCE_IMAGE_DIR for this automatically.
  */
-- (instancetype)initWithApp:(NSString *)app referenceDir:(NSString *)referenceDir;
+- (instancetype)initWithApp:(NSString *)app referenceDir:(NSString *)referenceDir NS_DESIGNATED_INITIALIZER;
 
 /**
  * Simplest runTest function simply mounts the specified JS module with no

Libraries/RCTTest/RCTTestRunner.m

@@ -10,6 +10,7 @@
 #import "RCTTestRunner.h"
 
 #import "FBSnapshotTestController.h"
+#import "RCTAssert.h"
 #import "RCTRedBox.h"
 #import "RCTRootView.h"
 #import "RCTTestModule.h"
@@ -30,6 +31,9 @@
 
 - (instancetype)initWithApp:(NSString *)app referenceDir:(NSString *)referenceDir
 {
+  RCTAssertParam(app);
+  RCTAssertParam(referenceDir);
+
   if ((self = [super init])) {
     NSString *sanitizedAppName = [app stringByReplacingOccurrencesOfString:@"/" withString:@"-"];
     sanitizedAppName = [sanitizedAppName stringByReplacingOccurrencesOfString:@"\\" withString:@"-"];
@@ -44,6 +48,8 @@
   return self;
 }
 
+RCT_NOT_IMPLEMENTED(-init)
+
 - (void)setRecordMode:(BOOL)recordMode
 {
   _testController.recordMode = recordMode;

Libraries/Settings/RCTSettings.xcodeproj/project.pbxproj

@@ -148,6 +148,7 @@
 				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
@@ -156,6 +157,10 @@
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
+				WARNING_CFLAGS = (
+					"-Werror",
+					"-Wall",
+				);
 			};
 			name = Debug;
 		};
@@ -182,6 +187,7 @@
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
@@ -190,6 +196,10 @@
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				VALIDATE_PRODUCT = YES;
+				WARNING_CFLAGS = (
+					"-Werror",
+					"-Wall",
+				);
 			};
 			name = Release;
 		};

Libraries/Text/RCTText.xcodeproj/project.pbxproj

@@ -186,6 +186,7 @@
 				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
@@ -194,6 +195,10 @@
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
+				WARNING_CFLAGS = (
+					"-Werror",
+					"-Wall",
+				);
 			};
 			name = Debug;
 		};
@@ -220,6 +225,7 @@
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
@@ -228,6 +234,10 @@
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				VALIDATE_PRODUCT = YES;
+				WARNING_CFLAGS = (
+					"-Werror",
+					"-Wall",
+				);
 			};
 			name = Release;
 		};

Libraries/Text/RCTTextView.m

@@ -25,6 +25,8 @@
 
 - (instancetype)initWithEventDispatcher:(RCTEventDispatcher *)eventDispatcher
 {
+  RCTAssertParam(eventDispatcher);
+
   if ((self = [super initWithFrame:CGRectZero])) {
     _contentInset = UIEdgeInsetsZero;
     _eventDispatcher = eventDispatcher;
@@ -35,10 +37,12 @@
     _textView.delegate = self;
     [self addSubview:_textView];
   }
-
   return self;
 }
 
+RCT_NOT_IMPLEMENTED(-initWithFrame:(CGRect)frame)
+RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
+
 - (void)updateFrames
 {
   // Adjust the insets so that they are as close as possible to single-line

Libraries/Vibration/RCTVibration.xcodeproj/project.pbxproj

@@ -150,6 +150,7 @@
 				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
@@ -163,6 +164,10 @@
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
+				WARNING_CFLAGS = (
+					"-Werror",
+					"-Wall",
+				);
 			};
 			name = Debug;
 		};
@@ -189,6 +194,7 @@
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
@@ -202,6 +208,10 @@
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				VALIDATE_PRODUCT = YES;
+				WARNING_CFLAGS = (
+					"-Werror",
+					"-Wall",
+				);
 			};
 			name = Release;
 		};

Libraries/WebSocket/RCTSRWebSocket.m

@@ -246,8 +246,9 @@ static __strong NSData *CRLFCRLF;
 
 - (instancetype)initWithURLRequest:(NSURLRequest *)request protocols:(NSArray *)protocols;
 {
+  RCTAssertParam(request);
+
   if ((self = [super init])) {
-    assert(request.URL);
     _url = request.URL;
     _urlRequest = request;
 
@@ -255,23 +256,24 @@ static __strong NSData *CRLFCRLF;
 
     [self _RCTSR_commonInit];
   }
-
   return self;
 }
 
+RCT_NOT_IMPLEMENTED(-init)
+
 - (instancetype)initWithURLRequest:(NSURLRequest *)request;
 {
   return [self initWithURLRequest:request protocols:nil];
 }
 
-- (instancetype)initWithURL:(NSURL *)url;
+- (instancetype)initWithURL:(NSURL *)URL;
 {
-  return [self initWithURL:url protocols:nil];
+  return [self initWithURL:URL protocols:nil];
 }
 
-- (instancetype)initWithURL:(NSURL *)url protocols:(NSArray *)protocols;
+- (instancetype)initWithURL:(NSURL *)URL protocols:(NSArray *)protocols;
 {
-  NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url];
+  NSURLRequest *request = URL ? [NSURLRequest requestWithURL:URL] : nil;
   return [self initWithURLRequest:request protocols:protocols];
 }
 
@@ -1610,7 +1612,7 @@ static NSRunLoop *networkRunLoop = nil;
     _runLoop = [NSRunLoop currentRunLoop];
     dispatch_group_leave(_waitGroup);
 
-    NSTimer *timer = [[NSTimer alloc] initWithFireDate:[NSDate distantFuture] interval:0.0 target:nil selector:nil userInfo:nil repeats:NO];
+    NSTimer *timer = [[NSTimer alloc] initWithFireDate:[NSDate distantFuture] interval:0.0 target:self selector:@selector(step) userInfo:nil repeats:NO];
     [_runLoop addTimer:timer forMode:NSDefaultRunLoopMode];
 
     while ([_runLoop runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]]) { }
@@ -1618,6 +1620,11 @@ static NSRunLoop *networkRunLoop = nil;
   }
 }
 
+- (void)step
+{
+  // Does nothing
+}
+
 - (NSRunLoop *)runLoop;
 {
   dispatch_group_wait(_waitGroup, DISPATCH_TIME_FOREVER);

Libraries/WebSocket/RCTWebSocket.xcodeproj/project.pbxproj

@@ -151,6 +151,7 @@
 				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
@@ -159,6 +160,10 @@
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
+				WARNING_CFLAGS = (
+					"-Werror",
+					"-Wall",
+				);
 			};
 			name = Debug;
 		};
@@ -187,6 +192,7 @@
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
@@ -195,6 +201,10 @@
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				VALIDATE_PRODUCT = YES;
+				WARNING_CFLAGS = (
+					"-Werror",
+					"-Wall",
+				);
 			};
 			name = Release;
 		};
@@ -202,6 +212,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				EXECUTABLE_PREFIX = lib;
+				GCC_TREAT_WARNINGS_AS_ERRORS = NO;
 				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
 					/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include,
@@ -218,6 +229,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				EXECUTABLE_PREFIX = lib;
+				GCC_TREAT_WARNINGS_AS_ERRORS = NO;
 				HEADER_SEARCH_PATHS = (
 					"$(inherited)",
 					/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include,

Libraries/WebSocket/RCTWebSocketExecutor.m

@@ -43,7 +43,9 @@ RCT_EXPORT_MODULE()
 
 - (instancetype)initWithURL:(NSURL *)URL
 {
-  if (self = [super init]) {
+  RCTAssertParam(URL);
+
+  if ((self = [super init])) {
     _url = URL;
   }
   return self;

React/Base/RCTAssert.h

@@ -27,12 +27,6 @@ typedef void (^RCTAssertFunction)(
   NSString *message
 );
 
-/**
- * Private logging function - ignore this.
- */
-RCT_EXTERN void _RCTAssertFormat(
-  BOOL, const char *, int, const char *, NSString *, ...) NS_FORMAT_FUNCTION(5,6);
-
 /**
  * This is the main assert macro that you should use.
  */
@@ -41,12 +35,19 @@ if (RCT_NSASSERT && !pass) { [[NSAssertionHandler currentHandler] handleFailureI
 file:@(__FILE__) lineNumber:__LINE__ description:__VA_ARGS__]; } \
 _RCTAssertFormat(pass, __FILE__, __LINE__, __func__, __VA_ARGS__); \
 } while (false)
+RCT_EXTERN void _RCTAssertFormat(BOOL, const char *, int, const char *, NSString *, ...) NS_FORMAT_FUNCTION(5,6);
+
+/**
+ * Convenience macro for asserting that a parameter is non-nil/non-zero.
+ */
+#define RCTAssertParam(name) RCTAssert(name, \
+@"'%s' is a required parameter", #name)
 
 /**
  * Convenience macro for asserting that we're running on main thread.
  */
 #define RCTAssertMainThread() RCTAssert([NSThread isMainThread], \
-@"This function must be called on the main thread");
+@"This function must be called on the main thread")
 
 /**
  * These methods get and set the current assert function called by the RCTAssert

React/Base/RCTAssert.m

@@ -13,6 +13,15 @@ NSString *const RCTErrorDomain = @"RCTErrorDomain";
 
 RCTAssertFunction RCTCurrentAssertFunction = nil;
 
+NSException *_RCTNotImplementedException(SEL, Class);
+NSException *_RCTNotImplementedException(SEL cmd, Class cls)
+{
+  NSString *msg = [NSString stringWithFormat:@"%s is not implemented "
+                   "for the class %@", sel_getName(cmd), cls];
+  return [NSException exceptionWithName:@"RCTNotDesignatedInitializerException"
+                                 reason:msg userInfo:nil];
+}
+
 void _RCTAssertFormat(
   BOOL condition,
   const char *fileName,

React/Base/RCTBridge.m

@@ -16,8 +16,10 @@
 #import <mach-o/dyld.h>
 #import <mach-o/getsect.h>
 
+#import "RCTAssert.h"
 #import "RCTContextExecutor.h"
 #import "RCTConvert.h"
+#import "RCTEventDispatcher.h"
 #import "RCTJavaScriptLoader.h"
 #import "RCTKeyCommands.h"
 #import "RCTLog.h"
@@ -185,7 +187,7 @@ static NSDictionary *RCTJSErrorFromNSError(NSError *error)
 
 @property (nonatomic, weak) RCTBridge *parentBridge;
 
-- (instancetype)initWithParentBridge:(RCTBridge *)bridge;
+- (instancetype)initWithParentBridge:(RCTBridge *)bridge NS_DESIGNATED_INITIALIZER;
 
 - (void)_actuallyInvokeAndProcessModule:(NSString *)module
                                  method:(NSString *)method
@@ -233,7 +235,7 @@ static NSDictionary *RCTJSErrorFromNSError(NSError *error)
     }
 
     NSMutableArray *argumentNames = [NSMutableArray array];
-    [typeRegex enumerateMatchesInString:objCMethodName options:0 range:NSMakeRange(0, objCMethodName.length) usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
+    [typeRegex enumerateMatchesInString:objCMethodName options:0 range:NSMakeRange(0, objCMethodName.length) usingBlock:^(NSTextCheckingResult *result, __unused NSMatchingFlags flags, __unused BOOL *stop) {
       NSString *argumentName = [objCMethodName substringWithRange:[result rangeAtIndex:1]];
       [argumentNames addObject:argumentName];
     }];
@@ -267,7 +269,7 @@ static NSDictionary *RCTJSErrorFromNSError(NSError *error)
     NSMutableArray *argumentBlocks = [[NSMutableArray alloc] initWithCapacity:numberOfArguments - 2];
 
 #define RCT_ARG_BLOCK(_logic) \
-  [argumentBlocks addObject:^(RCTBridge *bridge, NSNumber *context, NSInvocation *invocation, NSUInteger index, id json) { \
+  [argumentBlocks addObject:^(__unused RCTBridge *bridge, __unused NSNumber *context, NSInvocation *invocation, NSUInteger index, id json) { \
     _logic \
     [invocation setArgument:&value atIndex:index]; \
   }]; \
@@ -287,7 +289,7 @@ static NSDictionary *RCTJSErrorFromNSError(NSError *error)
                                    method:@"invokeCallbackAndReturnFlushedQueue"
                                 arguments:@[json, args]
                                   context:context];
-        } : ^(NSArray *unused) {});
+        } : ^(__unused NSArray *unused) {});
       )
     };
 
@@ -334,7 +336,7 @@ case _value: { \
             RCT_CONVERT_CASE('^', void *)
 
             case '{': {
-              [argumentBlocks addObject:^(RCTBridge *bridge, NSNumber *context, NSInvocation *invocation, NSUInteger index, id json) {
+              [argumentBlocks addObject:^(__unused RCTBridge *bridge, __unused NSNumber *context, NSInvocation *invocation, NSUInteger index, id json) {
                 NSMethodSignature *methodSignature = [RCTConvert methodSignatureForSelector:selector];
                 void *returnValue = malloc(methodSignature.methodReturnLength);
                 NSInvocation *_invocation = [NSInvocation invocationWithMethodSignature:methodSignature];
@@ -485,7 +487,8 @@ static RCTSparseArray *RCTExportedMethodsByModuleID(void)
   dispatch_once(&onceToken, ^{
     methodsByModuleID = [[RCTSparseArray alloc] initWithCapacity:[RCTModuleClassesByID count]];
 
-    [RCTModuleClassesByID enumerateObjectsUsingBlock:^(Class moduleClass, NSUInteger moduleID, BOOL *stop) {
+    [RCTModuleClassesByID enumerateObjectsUsingBlock:
+     ^(Class moduleClass, NSUInteger moduleID, __unused BOOL *stop) {
 
       methodsByModuleID[moduleID] = [[NSMutableArray alloc] init];
 
@@ -549,11 +552,13 @@ static NSDictionary *RCTRemoteModulesConfig(NSDictionary *modulesByName)
   dispatch_once(&onceToken, ^{
 
     remoteModuleConfigByClassName = [[NSMutableDictionary alloc] init];
-    [RCTModuleClassesByID enumerateObjectsUsingBlock:^(Class moduleClass, NSUInteger moduleID, BOOL *stop) {
+    [RCTModuleClassesByID enumerateObjectsUsingBlock:
+     ^(Class moduleClass, NSUInteger moduleID, __unused BOOL *stop) {
 
       NSArray *methods = RCTExportedMethodsByModuleID()[moduleID];
       NSMutableDictionary *methodsByName = [NSMutableDictionary dictionaryWithCapacity:methods.count];
-      [methods enumerateObjectsUsingBlock:^(RCTModuleMethod *method, NSUInteger methodID, BOOL *_stop) {
+      [methods enumerateObjectsUsingBlock:
+       ^(RCTModuleMethod *method, NSUInteger methodID, __unused BOOL *_stop) {
         methodsByName[method.JSMethodName] = @{
           @"methodID": @(methodID),
           @"type": method.functionKind == RCTJavaScriptFunctionKindAsync ? @"remoteAsync" : @"remote",
@@ -571,7 +576,8 @@ static NSDictionary *RCTRemoteModulesConfig(NSDictionary *modulesByName)
 
   // Create config
   NSMutableDictionary *moduleConfig = [[NSMutableDictionary alloc] init];
-  [modulesByName enumerateKeysAndObjectsUsingBlock:^(NSString *moduleName, id<RCTBridgeModule> module, BOOL *stop) {
+  [modulesByName enumerateKeysAndObjectsUsingBlock:
+   ^(NSString *moduleName, id<RCTBridgeModule> module, __unused BOOL *stop) {
 
     // Add constants
     NSMutableDictionary *config = remoteModuleConfigByClassName[NSStringFromClass([module class])];
@@ -688,6 +694,7 @@ static NSDictionary *RCTLocalModulesConfig()
 static id<RCTJavaScriptExecutor> _latestJSExecutor;
 
 #if RCT_DEBUG
+
 + (void)initialize
 {
   static dispatch_once_t onceToken;
@@ -717,6 +724,7 @@ static id<RCTJavaScriptExecutor> _latestJSExecutor;
 
   });
 }
+
 #endif
 
 - (instancetype)initWithBundleURL:(NSURL *)bundleURL
@@ -726,6 +734,7 @@ static id<RCTJavaScriptExecutor> _latestJSExecutor;
   RCTAssertMainThread();
 
   if ((self = [super init])) {
+
     /**
      * Pre register modules
      */
@@ -740,6 +749,8 @@ static id<RCTJavaScriptExecutor> _latestJSExecutor;
   return self;
 }
 
+RCT_NOT_IMPLEMENTED(-init)
+
 - (void)dealloc
 {
   /**
@@ -767,7 +778,7 @@ static id<RCTJavaScriptExecutor> _latestJSExecutor;
   // reload in current mode
   [commands registerKeyCommandWithInput:@"r"
                           modifierFlags:UIKeyModifierCommand
-                                 action:^(UIKeyCommand *command) {
+                                 action:^(__unused UIKeyCommand *command) {
                                    [weakSelf reload];
                                  }];
 
@@ -775,6 +786,11 @@ static id<RCTJavaScriptExecutor> _latestJSExecutor;
 
 }
 
+- (RCTEventDispatcher *)eventDispatcher
+{
+  return self.modules[RCTBridgeModuleNameForClass([RCTEventDispatcher class])];
+}
+
 - (void)reload
 {
   /**
@@ -822,7 +838,7 @@ static id<RCTJavaScriptExecutor> _latestJSExecutor;
                               method:@"logIfNoNativeHook"
                            arguments:@[level, message]
                              context:RCTGetExecutorID(_latestJSExecutor)
-                            callback:^(id json, NSError *error) {}];
+                            callback:^(__unused id json, __unused NSError *error) {}];
   });
 }
 
@@ -843,7 +859,10 @@ static id<RCTJavaScriptExecutor> _latestJSExecutor;
   [self.batchedBridge enqueueJSCall:moduleDotMethod args:args];
 }
 
-RCT_INNER_BRIDGE_ONLY(_invokeAndProcessModule:(NSString *)module method:(NSString *)method arguments:(NSArray *)args context:(NSNumber *)context)
+RCT_INNER_BRIDGE_ONLY(_invokeAndProcessModule:(__unused NSString *)module
+                      method:(__unused NSString *)method
+                      arguments:(__unused NSArray *)args
+                      context:(__unused NSNumber *)context)
 
 @end
 
@@ -866,8 +885,12 @@ RCT_INNER_BRIDGE_ONLY(_invokeAndProcessModule:(NSString *)module method:(NSStrin
 
 - (instancetype)initWithParentBridge:(RCTBridge *)bridge
 {
-  if (self = [super init]) {
   RCTAssertMainThread();
+  RCTAssertParam(bridge);
+
+  if ((self = [super initWithBundleURL:bridge.bundleURL
+                        moduleProvider:bridge.moduleProvider
+                         launchOptions:bridge.launchOptions])) {
 
     _parentBridge = bridge;
 
@@ -902,14 +925,11 @@ RCT_INNER_BRIDGE_ONLY(_invokeAndProcessModule:(NSString *)module method:(NSStrin
   return self;
 }
 
-- (NSURL *)bundleURL
+- (instancetype)initWithBundleURL:(__unused NSURL *)bundleURL
+                   moduleProvider:(__unused RCTBridgeModuleProviderBlock)block
+                    launchOptions:(__unused NSDictionary *)launchOptions
 {
-  return _parentBridge.bundleURL;
+  return [self initWithParentBridge:nil];
-}
-
-- (NSDictionary *)launchOptions
-{
-  return _parentBridge.launchOptions;
 }
 
 /**
@@ -950,14 +970,15 @@ RCT_INNER_BRIDGE_ONLY(_invokeAndProcessModule:(NSString *)module method:(NSStrin
 
   // Register passed-in module instances
   NSMutableDictionary *preregisteredModules = [[NSMutableDictionary alloc] init];
-  for (id<RCTBridgeModule> module in _parentBridge.moduleProvider ? _parentBridge.moduleProvider() : nil) {
+  for (id<RCTBridgeModule> module in self.moduleProvider ? self.moduleProvider() : nil) {
     preregisteredModules[RCTBridgeModuleNameForClass([module class])] = module;
   }
 
   // Instantiate modules
   _modulesByID = [[RCTSparseArray alloc] init];
   NSMutableDictionary *modulesByName = [preregisteredModules mutableCopy];
-  [RCTModuleClassesByID enumerateObjectsUsingBlock:^(Class moduleClass, NSUInteger moduleID, BOOL *stop) {
+  [RCTModuleClassesByID enumerateObjectsUsingBlock:
+   ^(Class moduleClass, NSUInteger moduleID, __unused BOOL *stop) {
     NSString *moduleName = RCTModuleNamesByID[moduleID];
     // Check if module instance has already been registered for this name
     id<RCTBridgeModule> module = modulesByName[moduleName];
@@ -1007,7 +1028,8 @@ RCT_INNER_BRIDGE_ONLY(_invokeAndProcessModule:(NSString *)module method:(NSStrin
   }
 
   // Get method queues
-  [_modulesByID enumerateObjectsUsingBlock:^(id<RCTBridgeModule> module, NSNumber *moduleID, BOOL *stop) {
+  [_modulesByID enumerateObjectsUsingBlock:
+   ^(id<RCTBridgeModule> module, NSNumber *moduleID, __unused BOOL *stop) {
     if ([module respondsToSelector:@selector(methodQueue)]) {
       dispatch_queue_t queue = [module methodQueue];
       if (queue) {
@@ -1034,7 +1056,8 @@ RCT_INNER_BRIDGE_ONLY(_invokeAndProcessModule:(NSString *)module method:(NSStrin
   }, NULL);
   dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);
   [_javaScriptExecutor injectJSONText:configJSON
-                  asGlobalObjectNamed:@"__fbBatchedBridgeConfig" callback:^(id err) {
+                  asGlobalObjectNamed:@"__fbBatchedBridgeConfig" callback:
+   ^(__unused id err) {
      dispatch_semaphore_signal(semaphore);
    }];
 
@@ -1350,7 +1373,7 @@ RCT_INNER_BRIDGE_ONLY(_invokeAndProcessModule:(NSString *)module method:(NSStrin
 
   [[NSNotificationCenter defaultCenter] postNotificationName:RCTEnqueueNotification object:nil userInfo:nil];
 
-  RCTJavaScriptCallback processResponse = ^(id json, NSError *error) {
+  RCTJavaScriptCallback processResponse = ^(id json, __unused NSError *error) {
     if (!self.isValid) {
       return;
     }
@@ -1453,7 +1476,8 @@ RCT_INNER_BRIDGE_ONLY(_invokeAndProcessModule:(NSString *)module method:(NSStrin
   }
 
   // TODO: batchDidComplete is only used by RCTUIManager - can we eliminate this special case?
-  [_modulesByID enumerateObjectsUsingBlock:^(id<RCTBridgeModule> module, NSNumber *moduleID, BOOL *stop) {
+  [_modulesByID enumerateObjectsUsingBlock:
+   ^(id<RCTBridgeModule> module, NSNumber *moduleID, __unused BOOL *stop) {
     if ([module respondsToSelector:@selector(batchDidComplete)]) {
       [self dispatchBlock:^{
         [module batchDidComplete];
@@ -1537,7 +1561,9 @@ RCT_INNER_BRIDGE_ONLY(_invokeAndProcessModule:(NSString *)module method:(NSStrin
 
   NSArray *calls = [_scheduledCallbacks.allObjects arrayByAddingObjectsFromArray:_scheduledCalls];
   NSNumber *currentExecutorID = RCTGetExecutorID(_javaScriptExecutor);
-  calls = [calls filteredArrayUsingPredicate:[NSPredicate predicateWithBlock:^BOOL(NSDictionary *call, NSDictionary *bindings) {
+  calls = [calls filteredArrayUsingPredicate:
+           [NSPredicate predicateWithBlock:
+            ^BOOL(NSDictionary *call, __unused NSDictionary *bindings) {
     return [call[@"context"] isEqualToNumber:currentExecutorID];
   }]];
 
@@ -1600,13 +1626,16 @@ RCT_INNER_BRIDGE_ONLY(_invokeAndProcessModule:(NSString *)module method:(NSStrin
     NSMutableURLRequest *URLRequest = [NSMutableURLRequest requestWithURL:URL];
     URLRequest.HTTPMethod = @"POST";
     [URLRequest setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
-    NSURLSessionTask *task = [[NSURLSession sharedSession] uploadTaskWithRequest:URLRequest
+    NSURLSessionTask *task =
+    [[NSURLSession sharedSession] uploadTaskWithRequest:URLRequest
                                                fromData:[log dataUsingEncoding:NSUTF8StringEncoding]
-                                                               completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
+                                      completionHandler:
+     ^(__unused NSData *data, __unused NSURLResponse *response, NSError *error) {
        if (error) {
          RCTLogError(@"%@", error.localizedDescription);
        }
      }];
+
     [task resume];
   }];
 }

React/Base/RCTCache.m

@@ -12,6 +12,8 @@
 #import <UIKit/UIKit.h>
 #import <sys/xattr.h>
 
+#import "RCTAssert.h"
+
 static NSString *const RCTCacheSubdirectoryName = @"React";
 static NSString *const RCTKeyExtendedAttributeName = @"com.facebook.React.RCTCacheManager.Key";
 static NSMapTable *RCTLivingCachesByName;
@@ -122,7 +124,8 @@ static BOOL RCTSetExtendedAttribute(NSURL *fileURL, NSString *key, NSString *val
 
 - (instancetype)initWithName:(NSString *)name
 {
-  NSParameterAssert(name.length < NAME_MAX);
+  RCTAssertParam(name);
+  RCTAssert(name.length < NAME_MAX, @"Name must be fewer than %i characters in length.", NAME_MAX);
   RCTCache *cachedCache = [RCTLivingCachesByName objectForKey:name];
   if (cachedCache) {
     self = cachedCache;
@@ -212,12 +215,12 @@ static BOOL RCTSetExtendedAttribute(NSURL *fileURL, NSString *key, NSString *val
   UIBackgroundTaskIdentifier identifier = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:nil];
   dispatch_group_t group = dispatch_group_create();
 
-  [_storage enumerateKeysAndObjectsUsingBlock:^(NSString *key, RCTCacheRecord *record, BOOL *stop) {
+  for (RCTCacheRecord *record in _storage.allValues) {
     NSURL *fileURL = [_cacheDirectoryURL URLByAppendingPathComponent:record.UUID.UUIDString];
     dispatch_group_async(group, record.queue, ^{
       [_fileManager removeItemAtURL:fileURL error:NULL];
     });
-  }];
+  }
 
   if (identifier != UIBackgroundTaskInvalid) {
     dispatch_group_notify(group, dispatch_get_main_queue(), ^{

React/Base/RCTConvert.m

@@ -536,32 +536,32 @@ RCT_CGSTRUCT_CONVERTER(CGAffineTransform, (@[
     }
 
     // Parse color
-    NSUInteger red = -1;
+    uint32_t red = 0, green = 0, blue = 0;
-    NSUInteger green = -1;
-    NSUInteger blue = -1;
     CGFloat alpha = 1.0;
     if ([colorString hasPrefix:@"#"]) {
       if (colorString.length == 4) { // 3 digit hex
-        sscanf([colorString UTF8String], "#%01tX%01tX%01tX", &red, &green, &blue);
+        sscanf([colorString UTF8String], "#%01x%01x%01x", &red, &green, &blue);
         // expand to 6 digit hex
         red = red | (red << 4);
         green = green | (green << 4);
         blue = blue | (blue << 4);
-      } else if (colorString.length == 7) { // normal 6 digit hex
+      } else if (colorString.length == 7) { // 6 digit hex
-        sscanf([colorString UTF8String], "#%02tX%02tX%02tX", &red, &green, &blue);
+        sscanf(colorString.UTF8String, "#%02x%02x%02x", &red, &green, &blue);
       } else {
-        RCTLogError(@"Invalid hex color %@. Hex colors should be 3 or 6 digits long", colorString);
+        RCTLogError(@"Invalid hex color %@. Hex colors should be 3 or 6 digits long.", colorString);
+        alpha = -1;
       }
     } else if ([colorString hasPrefix:@"rgba("]) {
       double tmpAlpha;
-      sscanf([colorString UTF8String], "rgba(%zd,%zd,%zd,%lf)", &red, &green, &blue, &tmpAlpha);
+      sscanf(colorString.UTF8String, "rgba(%u,%u,%u,%lf)", &red, &green, &blue, &tmpAlpha);
-      alpha = tmpAlpha > 0.99 ? 1.0 : tmpAlpha;
+      alpha = tmpAlpha;
     } else if ([colorString hasPrefix:@"rgb("]) {
-      sscanf([colorString UTF8String], "rgb(%zd,%zd,%zd)", &red, &green, &blue);
+      sscanf(colorString.UTF8String, "rgb(%u,%u,%u)", &red, &green, &blue);
     } else {
-      RCTLogError(@"Unrecognized color format '%@', must be one of #hex|rgba|rgb", colorString);
+      RCTLogError(@"Unrecognized color format '%@', must be one of #hex|rgba|rgb or a valid CSS color name.", colorString);
+      alpha = -1;
     }
-    if (red == -1 || green == -1 || blue == -1 || alpha > 1.0 || alpha < 0.0) {
+    if (alpha < 0) {
       RCTLogError(@"Invalid color string '%@'", colorString);
     } else {
       color = [UIColor colorWithRed:red / 255.0 green:green / 255.0 blue:blue / 255.0 alpha:alpha];
@@ -574,19 +574,19 @@ RCT_CGSTRUCT_CONVERTER(CGAffineTransform, (@[
     } else {
 
       // Color array
-      color = [UIColor colorWithRed:[self double:json[0]]
+      color = [UIColor colorWithRed:[self CGFloat:json[0]]
-                              green:[self double:json[1]]
+                              green:[self CGFloat:json[1]]
-                               blue:[self double:json[2]]
+                               blue:[self CGFloat:json[2]]
-                              alpha:[json count] > 3 ? [self double:json[3]] : 1];
+                              alpha:[json count] > 3 ? [self CGFloat:json[3]] : 1];
     }
 
   } else if ([json isKindOfClass:[NSDictionary class]]) {
 
     // Color dictionary
-    color = [UIColor colorWithRed:[self double:json[@"r"]]
+    color = [UIColor colorWithRed:[self CGFloat:json[@"r"]]
-                            green:[self double:json[@"g"]]
+                            green:[self CGFloat:json[@"g"]]
-                             blue:[self double:json[@"b"]]
+                             blue:[self CGFloat:json[@"b"]]
-                            alpha:[self double:json[@"a"] ?: @1]];
+                            alpha:[self CGFloat:json[@"a"] ?: @1]];
 
   }
   else if (RCT_DEBUG && json && json != (id)kCFNull) {
@@ -830,7 +830,7 @@ NSArray *RCTConvertArrayValue(SEL type, id json)
 {
   __block BOOL copy = NO;
   __block NSArray *values = json = [RCTConvert NSArray:json];
-  [json enumerateObjectsUsingBlock:^(id jsonValue, NSUInteger idx, BOOL *stop) {
+  [json enumerateObjectsUsingBlock:^(id jsonValue, NSUInteger idx, __unused BOOL *stop) {
     id value = ((id(*)(Class, SEL, id))objc_msgSend)([RCTConvert class], type, jsonValue);
     if (copy) {
       if (value) {
@@ -839,7 +839,7 @@ NSArray *RCTConvertArrayValue(SEL type, id json)
     } else if (value != jsonValue) {
       // Converted value is different, so we'll need to copy the array
       values = [[NSMutableArray alloc] initWithCapacity:values.count];
-      for (NSInteger i = 0; i < idx; i++) {
+      for (NSUInteger i = 0; i < idx; i++) {
         [(NSMutableArray *)values addObject:json[i]];
       }
       if (value) {
@@ -876,7 +876,7 @@ static id RCTConvertPropertyListValue(id json)
   if ([json isKindOfClass:[NSDictionary class]]) {
     __block BOOL copy = NO;
     NSMutableDictionary *values = [[NSMutableDictionary alloc] initWithCapacity:[json count]];
-    [json enumerateKeysAndObjectsUsingBlock:^(NSString *key, id jsonValue, BOOL *stop) {
+    [json enumerateKeysAndObjectsUsingBlock:^(NSString *key, id jsonValue, __unused BOOL *stop) {
       id value = RCTConvertPropertyListValue(jsonValue);
       if (value) {
         values[key] = value;
@@ -889,7 +889,7 @@ static id RCTConvertPropertyListValue(id json)
   if ([json isKindOfClass:[NSArray class]]) {
     __block BOOL copy = NO;
     __block NSArray *values = json;
-    [json enumerateObjectsUsingBlock:^(id jsonValue, NSUInteger idx, BOOL *stop) {
+    [json enumerateObjectsUsingBlock:^(id jsonValue, NSUInteger idx, __unused BOOL *stop) {
       id value = RCTConvertPropertyListValue(jsonValue);
       if (copy) {
         if (value) {
@@ -898,7 +898,7 @@ static id RCTConvertPropertyListValue(id json)
       } else if (value != jsonValue) {
         // Converted value is different, so we'll need to copy the array
         values = [[NSMutableArray alloc] initWithCapacity:values.count];
-        for (NSInteger i = 0; i < idx; i++) {
+        for (NSUInteger i = 0; i < idx; i++) {
           [(NSMutableArray *)values addObject:json[i]];
         }
         if (value) {

React/Base/RCTDefines.h

@@ -61,9 +61,19 @@
 #endif
 
 /**
- * Concat two literals. Supports macro expansions
+ * Concat two literals. Supports macro expansions,
- *
+ * e.g. RCT_CONCAT(foo, __FILE__).
- * i.e. RCT_CONCAT(foo, __FILE__)
  */
 #define RCT_CONCAT2(A, B) A ## B
 #define RCT_CONCAT(A, B) RCT_CONCAT2(A, B)
+
+/**
+ * Throw an assertion for unimplemented methods.
+ */
+#define RCT_NOT_IMPLEMENTED(method) \
+_Pragma("clang diagnostic push") \
+_Pragma("clang diagnostic ignored \"-Wmissing-method-return-type\"") \
+_Pragma("clang diagnostic ignored \"-Wunused-parameter\"") \
+RCT_EXTERN NSException *_RCTNotImplementedException(SEL, Class); \
+method NS_UNAVAILABLE { @throw _RCTNotImplementedException(_cmd, [self class]); } \
+_Pragma("clang diagnostic pop")

React/Base/RCTDevMenu.m

@@ -9,6 +9,7 @@
 
 #import "RCTDevMenu.h"
 
+#import "RCTAssert.h"
 #import "RCTBridge.h"
 #import "RCTDefines.h"
 #import "RCTEventDispatcher.h"
@@ -34,7 +35,7 @@ static NSString *const RCTDevMenuSettingsKey = @"RCTDevMenu";
 
 @implementation UIWindow (RCTDevMenu)
 
-- (void)RCT_motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event
+- (void)RCT_motionEnded:(__unused UIEventSubtype)motion withEvent:(UIEvent *)event
 {
   if (event.subtype == UIEventSubtypeMotionShake) {
     [[NSNotificationCenter defaultCenter] postNotificationName:RCTShowDevMenuNotification object:nil];
@@ -48,7 +49,7 @@ static NSString *const RCTDevMenuSettingsKey = @"RCTDevMenu";
 @property (nonatomic, copy) NSString *title;
 @property (nonatomic, copy) dispatch_block_t handler;
 
-- (instancetype)initWithTitle:(NSString *)title handler:(dispatch_block_t)handler;
+- (instancetype)initWithTitle:(NSString *)title handler:(dispatch_block_t)handler NS_DESIGNATED_INITIALIZER;
 
 @end
 
@@ -56,13 +57,15 @@ static NSString *const RCTDevMenuSettingsKey = @"RCTDevMenu";
 
 - (instancetype)initWithTitle:(NSString *)title handler:(dispatch_block_t)handler
 {
-  if (self = [super init]) {
+  if ((self = [super init])) {
-    self.title = title;
+    _title = [title copy];
-    self.handler = handler;
+    _handler = [handler copy];
   }
   return self;
 }
 
+RCT_NOT_IMPLEMENTED(-init)
+
 @end
 
 @interface RCTDevMenu () <RCTBridgeModule, UIActionSheetDelegate>
@@ -131,21 +134,23 @@ RCT_EXPORT_MODULE()
     // Toggle debug menu
     [commands registerKeyCommandWithInput:@"d"
                             modifierFlags:UIKeyModifierCommand
-                                   action:^(UIKeyCommand *command) {
+                                   action:^(__unused UIKeyCommand *command) {
                                      [weakSelf toggle];
                                    }];
 
     // Toggle element inspector
     [commands registerKeyCommandWithInput:@"i"
                             modifierFlags:UIKeyModifierCommand
-                                   action:^(UIKeyCommand *command) {
+                                   action:^(__unused UIKeyCommand *command) {
-                                     [_bridge.eventDispatcher sendDeviceEventWithName:@"toggleElementInspector" body:nil];
+                                     [_bridge.eventDispatcher
+                                      sendDeviceEventWithName:@"toggleElementInspector"
+                                      body:nil];
                                    }];
 
     // Reload in normal mode
     [commands registerKeyCommandWithInput:@"n"
                             modifierFlags:UIKeyModifierCommand
-                                   action:^(UIKeyCommand *command) {
+                                   action:^(__unused UIKeyCommand *command) {
                                      weakSelf.executorClass = Nil;
                                    }];
 #endif
@@ -454,7 +459,8 @@ RCT_EXPORT_METHOD(reload)
   }
 
   __weak RCTDevMenu *weakSelf = self;
-  _updateTask = [[NSURLSession sharedSession] dataTaskWithURL:_liveReloadURL completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
+  _updateTask = [[NSURLSession sharedSession] dataTaskWithURL:_liveReloadURL completionHandler:
+                 ^(__unused NSData *data, NSURLResponse *response, NSError *error) {
 
     dispatch_async(dispatch_get_main_queue(), ^{
       __strong RCTDevMenu *strongSelf = weakSelf;

React/Base/RCTEventDispatcher.m

@@ -31,6 +31,8 @@ static NSNumber *RCTGetEventID(id<RCTEvent> event)
                       eventName:(NSString *)eventName
                            body:(NSDictionary *)body
 {
+  RCTAssertParam(eventName);
+
   if ((self = [super init])) {
     _viewTag = viewTag;
     _eventName = eventName;
@@ -39,6 +41,8 @@ static NSNumber *RCTGetEventID(id<RCTEvent> event)
   return self;
 }
 
+RCT_NOT_IMPLEMENTED(-init)
+
 - (uint16_t)coalescingKey
 {
   return 0;
@@ -175,12 +179,10 @@ RCT_IMPORT_METHOD(RCTEventEmitter, receiveEvent);
   return RCTJSThread;
 }
 
-- (void)didUpdateFrame:(RCTFrameUpdate *)update
+- (void)didUpdateFrame:(__unused RCTFrameUpdate *)update
 {
-  NSDictionary *eventQueue;
-
   [_eventQueueLock lock];
-  eventQueue = _eventQueue;
+   NSDictionary *eventQueue = _eventQueue;
   _eventQueue = [[NSMutableDictionary alloc] init];
   _paused = YES;
   [_eventQueueLock unlock];
@@ -191,12 +193,3 @@ RCT_IMPORT_METHOD(RCTEventEmitter, receiveEvent);
 }
 
 @end
-
-@implementation RCTBridge (RCTEventDispatcher)
-
-- (RCTEventDispatcher *)eventDispatcher
-{
-  return self.modules[RCTBridgeModuleNameForClass([RCTEventDispatcher class])];
-}
-
-@end

React/Base/RCTFPSGraph.m

@@ -9,6 +9,7 @@
 
 #import "RCTFPSGraph.h"
 
+#import "RCTAssert.h"
 #import "RCTDefines.h"
 
 #if RCT_DEV
@@ -32,7 +33,7 @@
 
 - (instancetype)initWithFrame:(CGRect)frame graphPosition:(RCTFPSGraphPosition)position name:(NSString *)name color:(UIColor *)color
 {
-  if (self = [super initWithFrame:frame]) {
+  if ((self = [super initWithFrame:frame])) {
     _margin = 2;
     _prevTime = -1;
     _maxFPS = 0;
@@ -42,8 +43,10 @@
     _frames = malloc(sizeof(float) * _length);
     memset(_frames, 0, sizeof(float) * _length);
 
-    _name = name;
+    _name = name ?: @"FPS";
-    _position = position;
+    _position = position ?: RCTFPSGraphPositionLeft;
+
+    color = color ?: [UIColor greenColor];
     _graph = [self createGraph:color];
     _label = [self createLabel:color];
 
@@ -53,6 +56,9 @@
   return self;
 }
 
+RCT_NOT_IMPLEMENTED(-initWithFrame:(CGRect)frame)
+RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
+
 - (void)dealloc
 {
   free(_frames);

React/Base/RCTJavaScriptExecutor.h

@@ -43,7 +43,7 @@ typedef void (^RCTJavaScriptCallback)(id json, NSError *error);
  * Runs an application script, and notifies of the script load being complete via `onComplete`.
  */
 - (void)executeApplicationScript:(NSString *)script
-                       sourceURL:(NSURL *)url
+                       sourceURL:(NSURL *)sourceURL
                       onComplete:(RCTJavaScriptCompleteBlock)onComplete;
 
 - (void)injectJSONText:(NSString *)script

React/Base/RCTJavaScriptLoader.m

@@ -21,12 +21,16 @@
 
 - (instancetype)initWithBridge:(RCTBridge *)bridge
 {
+  RCTAssert(bridge, @"birdge parameter is required");
+
   if ((self = [super init])) {
     _bridge = bridge;
   }
   return self;
 }
 
+RCT_NOT_IMPLEMENTED(-init)
+
 - (void)loadBundleAtURL:(NSURL *)scriptURL onComplete:(void (^)(NSError *, NSString *))onComplete
 {
   // Sanitize the script URL

React/Base/RCTKeyCommands.m

@@ -77,7 +77,7 @@ static RCTKeyCommands *RKKeyCommandsSharedInstance = nil;
   // To fix this, we use a linear search, since there won't be many keys anyway
 
   [_commandBindings enumerateKeysAndObjectsUsingBlock:
-   ^(UIKeyCommand *k, void (^block)(UIKeyCommand *), BOOL *stop) {
+   ^(UIKeyCommand *k, void (^block)(UIKeyCommand *), __unused BOOL *stop) {
     if ([key.input isEqualToString:k.input] && key.modifierFlags == k.modifierFlags) {
       block(key);
     }
@@ -105,7 +105,7 @@ static RCTKeyCommands *RKKeyCommandsSharedInstance = nil;
                                               modifierFlags:flags
                                                      action:@selector(RCT_handleKeyCommand:)];
 
-  _commandBindings[command] = block ?: ^(UIKeyCommand *cmd) {};
+  _commandBindings[command] = block ?: ^(__unused UIKeyCommand *cmd) {};
 }
 
 - (void)unregisterKeyCommandWithInput:(NSString *)input

React/Base/RCTLog.h

@@ -90,13 +90,12 @@ RCT_EXTERN void RCTAddLogFunction(RCTLogFunction logFunction);
 RCT_EXTERN void RCTPerformBlockWithLogPrefix(void (^block)(void), NSString *prefix);
 
 /**
- * Private logging functions - ignore these.
+ * Private logging function - ignore this.
  */
-RCT_EXTERN void _RCTLogFormat(RCTLogLevel, const char *, int, NSString *, ...) NS_FORMAT_FUNCTION(4,5);
 #define _RCTLog(lvl, ...) do { \
 if (lvl >= RCTLOG_FATAL_LEVEL) { RCTAssert(NO, __VA_ARGS__); } \
-  _RCTLogFormat(lvl, __FILE__, __LINE__, __VA_ARGS__); \
+_RCTLogFormat(lvl, __FILE__, __LINE__, __VA_ARGS__); } while (0)
-} while (0)
+RCT_EXTERN void _RCTLogFormat(RCTLogLevel, const char *, int, NSString *, ...) NS_FORMAT_FUNCTION(4,5);
 
 /**
  * Logging macros. Use these to log information, warnings and errors in your

React/Base/RCTLog.m

@@ -173,16 +173,16 @@ void _RCTLogFormat(
     if (level >= RCTLOG_REDBOX_LEVEL) {
       NSArray *stackSymbols = [NSThread callStackSymbols];
       NSMutableArray *stack = [NSMutableArray arrayWithCapacity:(stackSymbols.count - 1)];
-        [stackSymbols enumerateObjectsUsingBlock:^(NSString *frameSymbols, NSUInteger idx, BOOL *stop) {
+      [stackSymbols enumerateObjectsUsingBlock:^(NSString *frameSymbols, NSUInteger idx, __unused BOOL *stop) {
-          if (idx != 0) { // don't include the current frame
+        if (idx > 0) { // don't include the current frame
           NSString *address = [[frameSymbols componentsSeparatedByString:@"0x"][1] componentsSeparatedByString:@" "][0];
           NSRange addressRange = [frameSymbols rangeOfString:address];
           NSString *methodName = [frameSymbols substringFromIndex:(addressRange.location + addressRange.length + 1)];
           if (idx == 1) {
             NSString *file = [[@(fileName) componentsSeparatedByString:@"/"] lastObject];
-              stack[0] = @{@"methodName": methodName, @"file": file, @"lineNumber": @(lineNumber)};
+            [stack addObject:@{@"methodName": methodName, @"file": file, @"lineNumber": @(lineNumber)}];
           } else {
-              stack[idx - 1] = @{@"methodName": methodName};
+            [stack addObject:@{@"methodName": methodName}];
           }
         }
       }];

React/Base/RCTProfile.m

@@ -118,7 +118,7 @@ static SEL RCTProfileProxySelector(SEL selector)
 }
 
 static void RCTProfileForwardInvocation(NSObject *, SEL, NSInvocation *);
-static void RCTProfileForwardInvocation(NSObject *self, SEL cmd, NSInvocation *invocation)
+static void RCTProfileForwardInvocation(NSObject *self, __unused SEL cmd, NSInvocation *invocation)
 {
   NSString *name = [NSString stringWithFormat:@"-[%@ %@]", NSStringFromClass([self class]), NSStringFromSelector(invocation.selector)];
   SEL newSel = RCTProfileProxySelector(invocation.selector);
@@ -150,7 +150,7 @@ static IMP RCTProfileMsgForward(NSObject *self, SEL selector)
 static void RCTProfileHookModules(RCTBridge *);
 static void RCTProfileHookModules(RCTBridge *bridge)
 {
-  [bridge.modules enumerateKeysAndObjectsUsingBlock:^(NSString *className, id<RCTBridgeModule> module, BOOL *stop) {
+  for (id<RCTBridgeModule> module in  bridge.modules.allValues) {
     [bridge dispatchBlock:^{
       Class moduleClass = object_getClass(module);
       Class proxyClass = objc_allocateClassPair(moduleClass, RCTProfileProxyClassName(moduleClass), 0);
@@ -183,13 +183,13 @@ static void RCTProfileHookModules(RCTBridge *bridge)
       objc_registerClassPair(proxyClass);
       object_setClass(module, proxyClass);
     } forModule:module];
-  }];
+  }
 }
 
 void RCTProfileUnhookModules(RCTBridge *);
 void RCTProfileUnhookModules(RCTBridge *bridge)
 {
-  [bridge.modules enumerateKeysAndObjectsUsingBlock:^(NSString *className, id<RCTBridgeModule> module, BOOL *stop) {
+  for (id<RCTBridgeModule> module in bridge.modules.allValues) {
     [bridge dispatchBlock:^{
       Class proxyClass = object_getClass(module);
       if (module.class != proxyClass) {
@@ -197,7 +197,7 @@ void RCTProfileUnhookModules(RCTBridge *bridge)
         objc_disposeClassPair(proxyClass);
       }
     } forModule:module];
-  }];
+  };
 }
 
 

React/Base/RCTRedBox.m

@@ -90,6 +90,8 @@
   return self;
 }
 
+RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
+
 - (void)dealloc
 {
   [[NSNotificationCenter defaultCenter] removeObserver:self];
@@ -145,12 +147,12 @@
 
 #pragma mark - TableView
 
-- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
+- (NSInteger)numberOfSectionsInTableView:(__unused UITableView *)tableView
 {
   return 2;
 }
 
-- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
+- (NSInteger)tableView:(__unused UITableView *)tableView numberOfRowsInSection:(NSInteger)section
 {
   return section == 0 ? 1 : [_lastStackTrace count];
 }

React/Base/RCTRootView.m

@@ -62,7 +62,7 @@ NSString *const RCTContentDidAppearNotification = @"RCTContentDidAppearNotificat
   RCTAssert(bridge, @"A bridge instance is required to create an RCTRootView");
   RCTAssert(moduleName, @"A moduleName is required to create an RCTRootView");
 
-  if ((self = [super init])) {
+  if ((self = [super initWithFrame:CGRectZero])) {
 
     self.backgroundColor = [UIColor whiteColor];
 
@@ -100,6 +100,9 @@ NSString *const RCTContentDidAppearNotification = @"RCTContentDidAppearNotificat
   return [self initWithBridge:bridge moduleName:moduleName];
 }
 
+RCT_NOT_IMPLEMENTED(-initWithFrame:(CGRect)frame)
+RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
+
 - (void)setBackgroundColor:(UIColor *)backgroundColor
 {
   super.backgroundColor = backgroundColor;
@@ -147,7 +150,7 @@ RCT_IMPORT_METHOD(ReactNative, unmountComponentAtNodeAndRemoveContainer)
                          options:UIViewAnimationOptionTransitionCrossDissolve
                       animations:^{
                         _loadingView.hidden = YES;
-                      } completion:^(BOOL finished) {
+                      } completion:^(__unused BOOL finished) {
                         [_loadingView removeFromSuperview];
                       }];
     });

React/Base/RCTTouchHandler.m

@@ -40,12 +40,11 @@
 
 - (instancetype)initWithBridge:(RCTBridge *)bridge
 {
+  RCTAssertParam(bridge);
+
   if ((self = [super initWithTarget:nil action:NULL])) {
 
-    RCTAssert(bridge != nil, @"Expect an event dispatcher");
-
     _bridge = bridge;
-
     _nativeTouches = [[NSMutableOrderedSet alloc] init];
     _reactTouches = [[NSMutableArray alloc] init];
     _touchViews = [[NSMutableArray alloc] init];
@@ -58,6 +57,8 @@
   return self;
 }
 
+RCT_NOT_IMPLEMENTED(-initWithTarget:(id)target action:(SEL)action)
+
 typedef NS_ENUM(NSInteger, RCTTouchEventType) {
   RCTTouchEventTypeStart,
   RCTTouchEventTypeMove,
@@ -163,7 +164,7 @@ RCT_IMPORT_METHOD(RCTEventEmitter, receiveTouches);
  */
 - (void)_updateAndDispatchTouches:(NSSet *)touches
                         eventName:(NSString *)eventName
-                  originatingTime:(CFTimeInterval)originatingTime
+                  originatingTime:(__unused CFTimeInterval)originatingTime
 {
   // Update touches
   NSMutableArray *changedIndexes = [[NSMutableArray alloc] init];
@@ -269,12 +270,12 @@ static BOOL RCTAnyTouchesChanged(NSSet *touches)
   }
 }
 
-- (BOOL)canPreventGestureRecognizer:(UIGestureRecognizer *)preventedGestureRecognizer
+- (BOOL)canPreventGestureRecognizer:(__unused UIGestureRecognizer *)preventedGestureRecognizer
 {
   return NO;
 }
 
-- (BOOL)canBePreventedByGestureRecognizer:(UIGestureRecognizer *)preventingGestureRecognizer
+- (BOOL)canBePreventedByGestureRecognizer:(__unused UIGestureRecognizer *)preventingGestureRecognizer
 {
   return NO;
 }

React/Base/RCTUtils.h

@@ -36,9 +36,6 @@ RCT_EXTERN CGFloat RCTRoundPixelValue(CGFloat value);
 RCT_EXTERN CGFloat RCTCeilPixelValue(CGFloat value);
 RCT_EXTERN CGFloat RCTFloorPixelValue(CGFloat value);
 
-// Get current time, for precise performance metrics
-RCT_EXTERN NSTimeInterval RCTTGetAbsoluteTime(void);
-
 // Method swizzling
 RCT_EXTERN void RCTSwapClassMethods(Class cls, SEL original, SEL replacement);
 RCT_EXTERN void RCTSwapInstanceMethods(Class cls, SEL original, SEL replacement);

React/Base/RCTUtils.m

@@ -70,7 +70,7 @@ id RCTJSONClean(id object)
   if ([object isKindOfClass:[NSDictionary class]]) {
     __block BOOL copy = NO;
     NSMutableDictionary *values = [[NSMutableDictionary alloc] initWithCapacity:[object count]];
-    [object enumerateKeysAndObjectsUsingBlock:^(NSString *key, id item, BOOL *stop) {
+    [object enumerateKeysAndObjectsUsingBlock:^(NSString *key, id item, __unused BOOL *stop) {
       id value = RCTJSONClean(item);
       values[key] = value;
       copy |= value != item;
@@ -81,14 +81,14 @@ id RCTJSONClean(id object)
   if ([object isKindOfClass:[NSArray class]]) {
     __block BOOL copy = NO;
     __block NSArray *values = object;
-    [object enumerateObjectsUsingBlock:^(id item, NSUInteger idx, BOOL *stop) {
+    [object enumerateObjectsUsingBlock:^(id item, NSUInteger idx, __unused BOOL *stop) {
       id value = RCTJSONClean(item);
       if (copy) {
         [(NSMutableArray *)values addObject:value];
       } else if (value != item) {
         // Converted value is different, so we'll need to copy the array
         values = [[NSMutableArray alloc] initWithCapacity:values.count];
-        for (NSInteger i = 0; i < idx; i++) {
+        for (NSUInteger i = 0; i < idx; i++) {
           [(NSMutableArray *)values addObject:object[i]];
         }
         [(NSMutableArray *)values addObject:value];
@@ -167,19 +167,6 @@ CGFloat RCTFloorPixelValue(CGFloat value)
   return floor(value * scale) / scale;
 }
 
-NSTimeInterval RCTTGetAbsoluteTime(void)
-{
-  static struct mach_timebase_info tb_info = {0};
-  static dispatch_once_t onceToken;
-  dispatch_once(&onceToken, ^{
-    int ret = mach_timebase_info(&tb_info);
-    assert(0 == ret);
-  });
-
-  uint64_t timeInNanoseconds = (mach_absolute_time() * tb_info.numer) / tb_info.denom;
-  return ((NSTimeInterval)timeInNanoseconds) / 1000000;
-}
-
 void RCTSwapClassMethods(Class cls, SEL original, SEL replacement)
 {
   Method originalMethod = class_getClassMethod(cls, original);

React/Executors/RCTContextExecutor.m

@@ -80,7 +80,7 @@ RCT_EXPORT_MODULE()
  * crashes.
  */
 
-static JSValueRef RCTNativeLoggingHook(JSContextRef context, JSObjectRef object, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef *exception)
+static JSValueRef RCTNativeLoggingHook(JSContextRef context, __unused JSObjectRef object, __unused JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef *exception)
 {
   if (argumentCount > 0) {
     JSStringRef messageRef = JSValueToStringCopy(context, arguments[0], exception);
@@ -109,7 +109,7 @@ static JSValueRef RCTNativeLoggingHook(JSContextRef context, JSObjectRef object,
 }
 
 // Do-very-little native hook for testing.
-static JSValueRef RCTNoop(JSContextRef context, JSObjectRef object, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef *exception)
+static JSValueRef RCTNoop(JSContextRef context, __unused JSObjectRef object, __unused JSObjectRef thisObject, __unused size_t argumentCount, __unused const JSValueRef arguments[], __unused JSValueRef *exception)
 {
   static int counter = 0;
   counter++;
@@ -120,7 +120,7 @@ static JSValueRef RCTNoop(JSContextRef context, JSObjectRef object, JSObjectRef
 
 static NSMutableArray *profiles;
 
-static JSValueRef RCTConsoleProfile(JSContextRef context, JSObjectRef object, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef *exception)
+static JSValueRef RCTConsoleProfile(JSContextRef context, __unused JSObjectRef object, __unused JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], __unused JSValueRef *exception)
 {
   static dispatch_once_t onceToken;
   dispatch_once(&onceToken, ^{
@@ -147,7 +147,7 @@ static JSValueRef RCTConsoleProfile(JSContextRef context, JSObjectRef object, JS
   return JSValueMakeUndefined(context);
 }
 
-static JSValueRef RCTConsoleProfileEnd(JSContextRef context, JSObjectRef object, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef *exception)
+static JSValueRef RCTConsoleProfileEnd(JSContextRef context, __unused JSObjectRef object, __unused JSObjectRef thisObject, __unused size_t argumentCount, __unused const JSValueRef arguments[], __unused JSValueRef *exception)
 {
   NSString *profileInfo = [profiles lastObject];
   [profiles removeLastObject];
@@ -311,7 +311,10 @@ static NSError *RCTNSErrorFromJSError(JSContextRef context, JSValueRef jsError)
   [[NSNotificationCenter defaultCenter] removeObserver:self];
 #endif
 
-  [_context performSelector:@selector(invalidate) onThread:_javaScriptThread withObject:nil waitUntilDone:NO];
+  [_context performSelector:@selector(invalidate)
+                   onThread:_javaScriptThread
+                 withObject:nil
+              waitUntilDone:NO];
 }
 
 - (void)dealloc

React/Executors/RCTWebViewExecutor.m

@@ -153,7 +153,8 @@ RCT_EXPORT_MODULE()
 
   if (_objectsToInject.count > 0) {
     NSMutableString *scriptWithInjections = [[NSMutableString alloc] initWithString:@"/* BEGIN NATIVELY INJECTED OBJECTS */\n"];
-    [_objectsToInject enumerateKeysAndObjectsUsingBlock:^(NSString *objectName, NSString *blockScript, BOOL *stop) {
+    [_objectsToInject enumerateKeysAndObjectsUsingBlock:
+     ^(NSString *objectName, NSString *blockScript, __unused BOOL *stop) {
       [scriptWithInjections appendString:objectName];
       [scriptWithInjections appendString:@" = ("];
       [scriptWithInjections appendString:blockScript];
@@ -200,7 +201,7 @@ RCT_EXPORT_MODULE()
 /**
  * `UIWebViewDelegate` methods. Handle application script load.
  */
-- (void)webViewDidFinishLoad:(UIWebView *)webView
+- (void)webViewDidFinishLoad:(__unused UIWebView *)webView
 {
   RCTAssertMainThread();
   if (_onApplicationScriptLoaded) {

React/Modules/RCTAlertManager.m

@@ -101,7 +101,7 @@ RCT_EXPORT_METHOD(alertWithArgs:(NSDictionary *)args
   }
 
   [_alerts addObject:alertView];
-  [_alertCallbacks addObject:callback ?: ^(id unused) {}];
+  [_alertCallbacks addObject:callback ?: ^(__unused id unused) {}];
   [_alertButtonKeys addObject:buttonKeys];
 
   [alertView show];

React/Modules/RCTTiming.m

@@ -139,7 +139,7 @@ RCT_IMPORT_METHOD(RCTJSTimers, callTimers)
   _paused = NO;
 }
 
-- (void)didUpdateFrame:(RCTFrameUpdate *)update
+- (void)didUpdateFrame:(__unused RCTFrameUpdate *)update
 {
   NSMutableArray *timersToCall = [[NSMutableArray alloc] init];
   for (RCTTimer *timer in _timers.allObjects) {

React/Modules/RCTUIManager.m

@@ -225,7 +225,7 @@ static NSString *RCTViewNameForModuleName(NSString *moduleName)
 }
 
 // TODO: only send name once instead of a dictionary of name and type keyed by name
-static NSDictionary *RCTViewConfigForModule(Class managerClass, NSString *viewName)
+static NSDictionary *RCTViewConfigForModule(Class managerClass)
 {
   unsigned int count = 0;
   Method *methods = class_copyMethodList(object_getClass(managerClass), &count);
@@ -308,11 +308,12 @@ static NSDictionary *RCTViewConfigForModule(Class managerClass, NSString *viewNa
   // Get view managers from bridge
   NSMutableDictionary *viewManagers = [[NSMutableDictionary alloc] init];
   NSMutableDictionary *viewConfigs = [[NSMutableDictionary alloc] init];
-  [_bridge.modules enumerateKeysAndObjectsUsingBlock:^(NSString *moduleName, RCTViewManager *manager, BOOL *stop) {
+  [_bridge.modules enumerateKeysAndObjectsUsingBlock:
+   ^(NSString *moduleName, RCTViewManager *manager, __unused BOOL *stop) {
     if ([manager isKindOfClass:[RCTViewManager class]]) {
       NSString *viewName = RCTViewNameForModuleName(moduleName);
       viewManagers[viewName] = manager;
-      viewConfigs[viewName] = RCTViewConfigForModule([manager class], viewName);
+      viewConfigs[viewName] = RCTViewConfigForModule([manager class]);
     }
   }];
 
@@ -325,7 +326,7 @@ static NSDictionary *RCTViewConfigForModule(Class managerClass, NSString *viewNa
   return _shadowQueue;
 }
 
-- (void)registerRootView:(UIView *)rootView;
+- (void)registerRootView:(UIView *)rootView
 {
   RCTAssertMainThread();
 
@@ -501,9 +502,9 @@ static NSDictionary *RCTViewConfigForModule(Class managerClass, NSString *viewNa
   }
 
   // Perform layout (possibly animated)
-  return ^(RCTUIManager *uiManager, RCTSparseArray *viewRegistry) {
+  return ^(__unused RCTUIManager *uiManager, RCTSparseArray *viewRegistry) {
     RCTResponseSenderBlock callback = self->_layoutAnimation.callback;
-    __block NSInteger completionsCalled = 0;
+    __block NSUInteger completionsCalled = 0;
     for (NSUInteger ii = 0; ii < frames.count; ii++) {
       NSNumber *reactTag = frameReactTags[ii];
       UIView *view = viewRegistry[reactTag];
@@ -515,7 +516,7 @@ static NSDictionary *RCTViewConfigForModule(Class managerClass, NSString *viewNa
       BOOL shouldAnimateCreation = isNew && ![parentsAreNew[ii] boolValue];
       RCTAnimation *createAnimation = shouldAnimateCreation ? _layoutAnimation.createAnimation : nil;
 
-      void (^completion)(BOOL finished) = ^(BOOL finished) {
+      void (^completion)(BOOL) = ^(BOOL finished) {
         completionsCalled++;
         if (event != (id)kCFNull) {
           [self.bridge.eventDispatcher sendInputEventWithName:@"topLayout" body:event];
@@ -578,7 +579,7 @@ static NSDictionary *RCTViewConfigForModule(Class managerClass, NSString *viewNa
   NSMutableSet *applierBlocks = [NSMutableSet setWithCapacity:1];
   [topView collectUpdatedProperties:applierBlocks parentProperties:@{}];
 
-  [self addUIBlock:^(RCTUIManager *uiManager, RCTSparseArray *viewRegistry) {
+  [self addUIBlock:^(__unused RCTUIManager *uiManager, RCTSparseArray *viewRegistry) {
     for (RCTApplierBlock block in applierBlocks) {
       block(viewRegistry);
     }
@@ -594,9 +595,9 @@ RCT_EXPORT_METHOD(removeSubviewsFromContainerWithID:(NSNumber *)containerID)
   id<RCTViewNodeProtocol> container = _shadowViewRegistry[containerID];
   RCTAssert(container != nil, @"container view (for ID %@) not found", containerID);
 
-  NSUInteger subviewsCount = [[container reactSubviews] count];
+  NSUInteger subviewsCount = [container reactSubviews].count;
   NSMutableArray *indices = [[NSMutableArray alloc] initWithCapacity:subviewsCount];
-  for (NSInteger childIndex = 0; childIndex < subviewsCount; childIndex++) {
+  for (NSUInteger childIndex = 0; childIndex < subviewsCount; childIndex++) {
     [indices addObject:@(childIndex)];
   }
 
@@ -619,20 +620,21 @@ RCT_EXPORT_METHOD(removeSubviewsFromContainerWithID:(NSNumber *)containerID)
 {
   // If there are no indices to move or the container has no subviews don't bother
   // We support parents with nil subviews so long as they're all nil so this allows for this behavior
-  if ([atIndices count] == 0 || [[container reactSubviews] count] == 0) {
+  if (atIndices.count == 0 || [container reactSubviews].count == 0) {
     return nil;
   }
   // Construction of removed children must be done "up front", before indices are disturbed by removals.
   NSMutableArray *removedChildren = [NSMutableArray arrayWithCapacity:atIndices.count];
   RCTAssert(container != nil, @"container view (for ID %@) not found", container);
-  for (NSInteger i = 0; i < [atIndices count]; i++) {
+  for (NSNumber *indexNumber in atIndices) {
-    NSInteger index = [atIndices[i] integerValue];
+    NSUInteger index = indexNumber.unsignedIntegerValue;
-    if (index < [[container reactSubviews] count]) {
+    if (index < [container reactSubviews].count) {
       [removedChildren addObject:[container reactSubviews][index]];
     }
   }
   if (removedChildren.count != atIndices.count) {
-    RCTLogMustFix(@"removedChildren count (%tu) was not what we expected (%tu)", removedChildren.count, atIndices.count);
+    RCTLogMustFix(@"removedChildren count (%tu) was not what we expected (%tu)",
+                  removedChildren.count, atIndices.count);
   }
   return removedChildren;
 }
@@ -778,7 +780,7 @@ static BOOL RCTCallPropertySetter(NSString *key, SEL setter, id value, id view,
 static void RCTSetViewProps(NSDictionary *props, UIView *view,
                             UIView *defaultView, RCTViewManager *manager)
 {
-  [props enumerateKeysAndObjectsUsingBlock:^(NSString *key, id obj, BOOL *stop) {
+  [props enumerateKeysAndObjectsUsingBlock:^(NSString *key, id obj, __unused BOOL *stop) {
 
     SEL setter = NSSelectorFromString([NSString stringWithFormat:@"set_%@:forView:withDefaultView:", key]);
     RCTCallPropertySetter(key, setter, obj, view, defaultView, manager);
@@ -789,7 +791,7 @@ static void RCTSetViewProps(NSDictionary *props, UIView *view,
 static void RCTSetShadowViewProps(NSDictionary *props, RCTShadowView *shadowView,
                                   RCTShadowView *defaultView, RCTViewManager *manager)
 {
-  [props enumerateKeysAndObjectsUsingBlock:^(NSString *key, id obj, BOOL *stop) {
+  [props enumerateKeysAndObjectsUsingBlock:^(NSString *key, id obj, __unused BOOL *stop) {
 
     SEL setter = NSSelectorFromString([NSString stringWithFormat:@"set_%@:forShadowView:withDefaultView:", key]);
     RCTCallPropertySetter(key, setter, obj, shadowView, defaultView, manager);
@@ -877,7 +879,7 @@ RCT_EXPORT_METHOD(updateView:(NSNumber *)reactTag
   RCTSetShadowViewProps(props, shadowView, _defaultShadowViews[viewName], viewManager);
 
   [self addUIBlock:^(RCTUIManager *uiManager, RCTSparseArray *viewRegistry) {
-    UIView *view = uiManager->_viewRegistry[reactTag];
+    UIView *view = viewRegistry[reactTag];
     RCTSetViewProps(props, view, uiManager->_defaultViews[viewName], viewManager);
   }];
 }
@@ -885,7 +887,7 @@ RCT_EXPORT_METHOD(updateView:(NSNumber *)reactTag
 RCT_EXPORT_METHOD(focus:(NSNumber *)reactTag)
 {
   if (!reactTag) return;
-  [self addUIBlock:^(RCTUIManager *uiManager, RCTSparseArray *viewRegistry) {
+  [self addUIBlock:^(__unused RCTUIManager *uiManager, RCTSparseArray *viewRegistry) {
     UIView *newResponder = viewRegistry[reactTag];
     [newResponder reactWillMakeFirstResponder];
     [newResponder becomeFirstResponder];
@@ -896,7 +898,7 @@ RCT_EXPORT_METHOD(focus:(NSNumber *)reactTag)
 RCT_EXPORT_METHOD(blur:(NSNumber *)reactTag)
 {
   if (!reactTag) return;
-  [self addUIBlock:^(RCTUIManager *uiManager, RCTSparseArray *viewRegistry){
+  [self addUIBlock:^(__unused RCTUIManager *uiManager, RCTSparseArray *viewRegistry){
     UIView *currentResponder = viewRegistry[reactTag];
     [currentResponder resignFirstResponder];
   }];
@@ -908,7 +910,7 @@ RCT_EXPORT_METHOD(findSubviewIn:(NSNumber *)reactTag atPoint:(CGPoint)point call
     return;
   }
 
-  [self addUIBlock:^(RCTUIManager *uiManager, RCTSparseArray *viewRegistry) {
+  [self addUIBlock:^(__unused RCTUIManager *uiManager, RCTSparseArray *viewRegistry) {
     UIView *view = viewRegistry[reactTag];
     UIView *target = [view hitTest:point withEvent:nil];
     CGRect frame = [target convertRect:target.bounds toView:view];
@@ -940,7 +942,7 @@ RCT_EXPORT_METHOD(findSubviewIn:(NSNumber *)reactTag atPoint:(CGPoint)point call
   // Set up next layout animation
   if (_nextLayoutAnimation) {
     RCTLayoutAnimation *layoutAnimation = _nextLayoutAnimation;
-    [self addUIBlock:^(RCTUIManager *uiManager, RCTSparseArray *viewRegistry) {
+    [self addUIBlock:^(RCTUIManager *uiManager, __unused RCTSparseArray *viewRegistry) {
       uiManager->_layoutAnimation = layoutAnimation;
     }];
   }
@@ -954,7 +956,7 @@ RCT_EXPORT_METHOD(findSubviewIn:(NSNumber *)reactTag atPoint:(CGPoint)point call
 
   // Clear layout animations
   if (_nextLayoutAnimation) {
-    [self addUIBlock:^(RCTUIManager *uiManager, RCTSparseArray *viewRegistry) {
+    [self addUIBlock:^(RCTUIManager *uiManager, __unused RCTSparseArray *viewRegistry) {
       uiManager->_layoutAnimation = nil;
     }];
     _nextLayoutAnimation = nil;
@@ -996,7 +998,7 @@ RCT_EXPORT_METHOD(measure:(NSNumber *)reactTag
     return;
   }
 
-  [self addUIBlock:^(RCTUIManager *uiManager, RCTSparseArray *viewRegistry) {
+  [self addUIBlock:^(__unused RCTUIManager *uiManager, RCTSparseArray *viewRegistry) {
     UIView *view = viewRegistry[reactTag];
     if (!view) {
       RCTLogError(@"measure cannot find view with tag #%@", reactTag);
@@ -1063,7 +1065,7 @@ static void RCTMeasureLayout(RCTShadowView *view,
  */
 RCT_EXPORT_METHOD(measureLayout:(NSNumber *)reactTag
                   relativeTo:(NSNumber *)ancestorReactTag
-                  errorCallback:(RCTResponseSenderBlock)errorCallback
+                  errorCallback:(__unused RCTResponseSenderBlock)errorCallback
                   callback:(RCTResponseSenderBlock)callback)
 {
   RCTShadowView *shadowView = _shadowViewRegistry[reactTag];
@@ -1079,7 +1081,7 @@ RCT_EXPORT_METHOD(measureLayout:(NSNumber *)reactTag
  * height).
  */
 RCT_EXPORT_METHOD(measureLayoutRelativeToParent:(NSNumber *)reactTag
-                  errorCallback:(RCTResponseSenderBlock)errorCallback
+                  errorCallback:(__unused RCTResponseSenderBlock)errorCallback
                   callback:(RCTResponseSenderBlock)callback)
 {
   RCTShadowView *shadowView = _shadowViewRegistry[reactTag];
@@ -1095,7 +1097,7 @@ RCT_EXPORT_METHOD(measureLayoutRelativeToParent:(NSNumber *)reactTag
  */
 RCT_EXPORT_METHOD(measureViewsInRect:(CGRect)rect
                   parentView:(NSNumber *)reactTag
-                  errorCallback:(RCTResponseSenderBlock)errorCallback
+                  errorCallback:(__unused RCTResponseSenderBlock)errorCallback
                   callback:(RCTResponseSenderBlock)callback)
 {
   RCTShadowView *shadowView = _shadowViewRegistry[reactTag];
@@ -1107,7 +1109,8 @@ RCT_EXPORT_METHOD(measureViewsInRect:(CGRect)rect
   NSMutableArray *results = [[NSMutableArray alloc] initWithCapacity:[childShadowViews count]];
 
 
-  [childShadowViews enumerateObjectsUsingBlock:^(RCTShadowView *childShadowView, NSUInteger idx, BOOL *stop) {
+  [childShadowViews enumerateObjectsUsingBlock:
+   ^(RCTShadowView *childShadowView, NSUInteger idx, __unused BOOL *stop) {
     CGRect childLayout = [childShadowView measureLayoutRelativeToAncestor:shadowView];
     if (CGRectIsNull(childLayout)) {
       RCTLogError(@"View %@ (tag #%@) is not a decendant of %@ (tag #%@)",
@@ -1167,7 +1170,7 @@ RCT_EXPORT_METHOD(scrollTo:(NSNumber *)reactTag
                   withOffsetX:(CGFloat)offsetX
                   offsetY:(CGFloat)offsetY)
 {
-  [self addUIBlock:^(RCTUIManager *uiManager, RCTSparseArray *viewRegistry){
+  [self addUIBlock:^(__unused RCTUIManager *uiManager, RCTSparseArray *viewRegistry){
     UIView *view = viewRegistry[reactTag];
     if ([view conformsToProtocol:@protocol(RCTScrollableProtocol)]) {
       [(id<RCTScrollableProtocol>)view scrollToOffset:(CGPoint){offsetX, offsetY} animated:YES];
@@ -1182,7 +1185,7 @@ RCT_EXPORT_METHOD(scrollWithoutAnimationTo:(NSNumber *)reactTag
                   offsetX:(CGFloat)offsetX
                   offsetY:(CGFloat)offsetY)
 {
-    [self addUIBlock:^(RCTUIManager *uiManager, RCTSparseArray *viewRegistry){
+    [self addUIBlock:^(__unused RCTUIManager *uiManager, RCTSparseArray *viewRegistry){
         UIView *view = viewRegistry[reactTag];
         if ([view conformsToProtocol:@protocol(RCTScrollableProtocol)]) {
             [(id<RCTScrollableProtocol>)view scrollToOffset:(CGPoint){offsetX, offsetY} animated:NO];
@@ -1195,7 +1198,7 @@ RCT_EXPORT_METHOD(scrollWithoutAnimationTo:(NSNumber *)reactTag
 RCT_EXPORT_METHOD(zoomToRect:(NSNumber *)reactTag
                   withRect:(CGRect)rect)
 {
-  [self addUIBlock:^(RCTUIManager *uiManager, RCTSparseArray *viewRegistry){
+  [self addUIBlock:^(__unused RCTUIManager *uiManager, RCTSparseArray *viewRegistry){
     UIView *view = viewRegistry[reactTag];
     if ([view conformsToProtocol:@protocol(RCTScrollableProtocol)]) {
       [(id<RCTScrollableProtocol>)view zoomToRect:rect animated:YES];
@@ -1211,7 +1214,7 @@ RCT_EXPORT_METHOD(zoomToRect:(NSNumber *)reactTag
  */
 RCT_EXPORT_METHOD(setJSResponder:(NSNumber *)reactTag)
 {
-  [self addUIBlock:^(RCTUIManager *uiManager, RCTSparseArray *viewRegistry) {
+  [self addUIBlock:^(__unused RCTUIManager *uiManager, RCTSparseArray *viewRegistry) {
     _jsResponder = viewRegistry[reactTag];
     if (!_jsResponder) {
       RCTLogError(@"Invalid view set to be the JS responder - tag %zd", reactTag);
@@ -1221,7 +1224,7 @@ RCT_EXPORT_METHOD(setJSResponder:(NSNumber *)reactTag)
 
 RCT_EXPORT_METHOD(clearJSResponder)
 {
-  [self addUIBlock:^(RCTUIManager *uiManager, RCTSparseArray *viewRegistry) {
+  [self addUIBlock:^(__unused RCTUIManager *uiManager, __unused RCTSparseArray *viewRegistry) {
     _jsResponder = nil;
   }];
 }
@@ -1326,7 +1329,7 @@ RCT_EXPORT_METHOD(clearJSResponder)
     },
   } mutableCopy];
 
-  [_viewManagers enumerateKeysAndObjectsUsingBlock:^(NSString *name, RCTViewManager *manager, BOOL *stop) {
+  for (RCTViewManager *manager in _viewManagers) {
     if (RCTClassOverridesInstanceMethod([manager class], @selector(customBubblingEventTypes))) {
       NSDictionary *eventTypes = [manager customBubblingEventTypes];
       for (NSString *eventName in eventTypes) {
@@ -1335,7 +1338,7 @@ RCT_EXPORT_METHOD(clearJSResponder)
       }
       [customBubblingEventTypesConfigs addEntriesFromDictionary:eventTypes];
     }
-  }];
+  };
 
   return customBubblingEventTypesConfigs;
 }
@@ -1387,7 +1390,7 @@ RCT_EXPORT_METHOD(clearJSResponder)
     },
   } mutableCopy];
 
-  [_viewManagers enumerateKeysAndObjectsUsingBlock:^(NSString *name, RCTViewManager *manager, BOOL *stop) {
+  for (RCTViewManager *manager in _viewManagers) {
     if (RCTClassOverridesInstanceMethod([manager class], @selector(customDirectEventTypes))) {
       NSDictionary *eventTypes = [manager customDirectEventTypes];
       for (NSString *eventName in eventTypes) {
@@ -1395,7 +1398,7 @@ RCT_EXPORT_METHOD(clearJSResponder)
       }
       [customDirectEventTypes addEntriesFromDictionary:eventTypes];
     }
-  }];
+  };
 
   return customDirectEventTypes;
 }
@@ -1418,8 +1421,11 @@ RCT_EXPORT_METHOD(clearJSResponder)
     },
   } mutableCopy];
 
-  [_viewManagers enumerateKeysAndObjectsUsingBlock:^(NSString *name, RCTViewManager *manager, BOOL *stop) {
+  [_viewManagers enumerateKeysAndObjectsUsingBlock:
-    NSMutableDictionary *constantsNamespace = [NSMutableDictionary dictionaryWithDictionary:allJSConstants[name]];
+   ^(NSString *name, RCTViewManager *manager, __unused BOOL *stop) {
+
+    NSMutableDictionary *constantsNamespace =
+     [NSMutableDictionary dictionaryWithDictionary:allJSConstants[name]];
 
     // Add custom constants
     // TODO: should these be inherited?
@@ -1440,7 +1446,7 @@ RCT_EXPORT_METHOD(clearJSResponder)
 
 RCT_EXPORT_METHOD(configureNextLayoutAnimation:(NSDictionary *)config
                   withCallback:(RCTResponseSenderBlock)callback
-                  errorCallback:(RCTResponseSenderBlock)errorCallback)
+                  errorCallback:(__unused RCTResponseSenderBlock)errorCallback)
 {
   if (_nextLayoutAnimation) {
     RCTLogWarn(@"Warning: Overriding previous layout animation with new one before the first began:\n%@ -> %@.", _nextLayoutAnimation, config);

React/React.xcodeproj/project.pbxproj

@@ -618,6 +618,7 @@
 				GCC_SYMBOLS_PRIVATE_EXTERN = NO;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
@@ -626,6 +627,10 @@
 				MTL_ENABLE_DEBUG_INFO = YES;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
+				WARNING_CFLAGS = (
+					"-Wextra",
+					"-Wall",
+				);
 			};
 			name = Debug;
 		};
@@ -654,6 +659,7 @@
 				GCC_PREPROCESSOR_DEFINITIONS = "";
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES;
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
@@ -662,6 +668,10 @@
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				VALIDATE_PRODUCT = YES;
+				WARNING_CFLAGS = (
+					"-Wextra",
+					"-Wall",
+				);
 			};
 			name = Release;
 		};

React/Views/RCTMapManager.m

@@ -64,7 +64,7 @@ RCT_CUSTOM_VIEW_PROPERTY(region, MKCoordinateRegion, RCTMap)
   }
 }
 
-- (void)mapView:(RCTMap *)mapView regionWillChangeAnimated:(BOOL)animated
+- (void)mapView:(RCTMap *)mapView regionWillChangeAnimated:(__unused BOOL)animated
 {
   [self _regionChanged:mapView];
 
@@ -77,7 +77,7 @@ RCT_CUSTOM_VIEW_PROPERTY(region, MKCoordinateRegion, RCTMap)
   [[NSRunLoop mainRunLoop] addTimer:mapView.regionChangeObserveTimer forMode:NSRunLoopCommonModes];
 }
 
-- (void)mapView:(RCTMap *)mapView regionDidChangeAnimated:(BOOL)animated
+- (void)mapView:(RCTMap *)mapView regionDidChangeAnimated:(__unused BOOL)animated
 {
   [mapView.regionChangeObserveTimer invalidate];
   mapView.regionChangeObserveTimer = nil;

React/Views/RCTNavigator.m

@@ -267,8 +267,10 @@ NSInteger kNeverProgressed = -10000;
 
 @synthesize paused = _paused;
 
-- (id)initWithBridge:(RCTBridge *)bridge
+- (instancetype)initWithBridge:(RCTBridge *)bridge
 {
+  RCTAssertParam(bridge);
+
   if ((self = [super initWithFrame:CGRectZero])) {
     _paused = YES;
 
@@ -291,7 +293,10 @@ NSInteger kNeverProgressed = -10000;
   return self;
 }
 
-- (void)didUpdateFrame:(RCTFrameUpdate *)update
+RCT_NOT_IMPLEMENTED(-initWithFrame:(CGRect)frame)
+RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
+
+- (void)didUpdateFrame:(__unused RCTFrameUpdate *)update
 {
   if (_currentlyTransitioningFrom != _currentlyTransitioningTo) {
     UIView *topView = _dummyView;
@@ -328,8 +333,8 @@ NSInteger kNeverProgressed = -10000;
  * locks aside from the animation complete hook.
  */
 - (void)navigationController:(UINavigationController *)navigationController
-      willShowViewController:(UIViewController *)viewController
+      willShowViewController:(__unused UIViewController *)viewController
-                    animated:(BOOL)animated
+                    animated:(__unused BOOL)animated
 {
   id<UIViewControllerTransitionCoordinator> tc =
     navigationController.topViewController.transitionCoordinator;
@@ -343,12 +348,12 @@ NSInteger kNeverProgressed = -10000;
     NSUInteger indexOfFrom = [_currentViews indexOfObject:fromController.navItem];
     NSUInteger indexOfTo = [_currentViews indexOfObject:toController.navItem];
     CGFloat destination = indexOfFrom < indexOfTo ? 1.0 : -1.0;
-    _dummyView.frame = (CGRect){{destination}};
+    _dummyView.frame = (CGRect){{destination, 0}, CGSizeZero};
     _currentlyTransitioningFrom = indexOfFrom;
     _currentlyTransitioningTo = indexOfTo;
     _paused = NO;
   }
-  completion:^(id<UIViewControllerTransitionCoordinatorContext> context) {
+  completion:^(__unused id<UIViewControllerTransitionCoordinatorContext> context) {
     [weakSelf freeLock];
     _currentlyTransitioningFrom = 0;
     _currentlyTransitioningTo = 0;
@@ -441,13 +446,13 @@ NSInteger kNeverProgressed = -10000;
   // hooked up yet, so we do it on demand here
   [self addControllerToClosestParent:_navigationController];
 
-  NSInteger viewControllerCount = _navigationController.viewControllers.count;
+  NSUInteger viewControllerCount = _navigationController.viewControllers.count;
   // The "react count" is the count of views that are visible on the navigation
   // stack.  There may be more beyond this - that aren't visible, and may be
   // deleted/purged soon.
-  NSInteger previousReactCount =
+  NSUInteger previousReactCount =
     _previousRequestedTopOfStack == kNeverRequested ? 0 : _previousRequestedTopOfStack + 1;
-  NSInteger currentReactCount = _requestedTopOfStack + 1;
+  NSUInteger currentReactCount = _requestedTopOfStack + 1;
 
   BOOL jsGettingAhead =
     //    ----- previously caught up ------          ------ no longer caught up -------
@@ -486,7 +491,7 @@ BOOL jsGettingtooSlow =
 
   // Views before the previous React count must not have changed. Views greater than previousReactCount
   // up to currentReactCount may have changed.
-  for (NSInteger i = 0; i < MIN(_currentViews.count, MIN(_previousViews.count, previousReactCount)); i++) {
+  for (NSUInteger i = 0; i < MIN(_currentViews.count, MIN(_previousViews.count, previousReactCount)); i++) {
     if (_currentViews[i] != _previousViews[i]) {
       RCTLogError(@"current view should equal previous view");
     }

React/Views/RCTNavigatorManager.m

@@ -37,10 +37,11 @@ RCT_EXPORT_VIEW_PROPERTY(requestedTopOfStack, NSInteger)
 
 // TODO: remove error callbacks
 RCT_EXPORT_METHOD(requestSchedulingJavaScriptNavigation:(NSNumber *)reactTag
-                  errorCallback:(RCTResponseSenderBlock)errorCallback
+                  errorCallback:(__unused RCTResponseSenderBlock)errorCallback
-                  callback:(__unused RCTResponseSenderBlock)callback)
+                  callback:(RCTResponseSenderBlock)callback)
 {
-  [self.bridge.uiManager addUIBlock:^(RCTUIManager *uiManager, RCTSparseArray *viewRegistry){
+  [self.bridge.uiManager addUIBlock:
+   ^(__unused RCTUIManager *uiManager, RCTSparseArray *viewRegistry){
     RCTNavigator *navigator = viewRegistry[reactTag];
     if ([navigator isKindOfClass:[RCTNavigator class]]) {
       BOOL wasAcquired = [navigator requestSchedulingJavaScriptNavigation];

React/Views/RCTPicker.m

@@ -27,9 +27,11 @@ const NSInteger UNINITIALIZED_INDEX = -1;
   NSInteger _selectedIndex;
 }
 
-- (id)initWithEventDispatcher:(RCTEventDispatcher *)eventDispatcher
+- (instancetype)initWithEventDispatcher:(RCTEventDispatcher *)eventDispatcher
 {
-  if (self = [super initWithFrame:CGRectZero]) {
+  RCTAssertParam(eventDispatcher);
+
+  if ((self = [super initWithFrame:CGRectZero])) {
     _eventDispatcher = eventDispatcher;
     _selectedIndex = UNINITIALIZED_INDEX;
     self.delegate = self;
@@ -37,13 +39,14 @@ const NSInteger UNINITIALIZED_INDEX = -1;
   return self;
 }
 
+RCT_NOT_IMPLEMENTED(-initWithFrame:(CGRect)frame)
+RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
+
 - (void)setItems:(NSArray *)items
 {
-  if (_items != items) {
   _items = [items copy];
   [self setNeedsLayout];
 }
-}
 
 - (void)setSelectedIndex:(NSInteger)selectedIndex
 {
@@ -58,12 +61,13 @@ const NSInteger UNINITIALIZED_INDEX = -1;
 
 #pragma mark - UIPickerViewDataSource protocol
 
-- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
+- (NSInteger)numberOfComponentsInPickerView:(__unused UIPickerView *)pickerView
 {
   return 1;
 }
 
-- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
+- (NSInteger)pickerView:(__unused UIPickerView *)pickerView
+numberOfRowsInComponent:(__unused NSInteger)component
 {
   return _items.count;
 }
@@ -80,12 +84,14 @@ const NSInteger UNINITIALIZED_INDEX = -1;
   return [self itemForRow:row][@"value"];
 }
 
-- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
+- (NSString *)pickerView:(__unused UIPickerView *)pickerView
+             titleForRow:(NSInteger)row forComponent:(__unused NSInteger)component
 {
   return [self itemForRow:row][@"label"];
 }
 
-- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
+- (void)pickerView:(__unused UIPickerView *)pickerView
+      didSelectRow:(NSInteger)row inComponent:(__unused NSInteger)component
 {
   _selectedIndex = row;
   NSDictionary *event = @{
@@ -96,4 +102,5 @@ const NSInteger UNINITIALIZED_INDEX = -1;
 
   [_eventDispatcher sendInputEventWithName:@"topChange" body:event];
 }
+
 @end

React/Views/RCTPickerManager.m

@@ -27,7 +27,7 @@ RCT_EXPORT_VIEW_PROPERTY(selectedIndex, NSInteger)
 
 - (NSDictionary *)constantsToExport
 {
-  RCTPicker *view = [[RCTPicker alloc] init];
+  UIPickerView *view = [[UIPickerView alloc] init];
   return @{
     @"ComponentHeight": @(view.intrinsicContentSize.height),
     @"ComponentWidth": @(view.intrinsicContentSize.width)

React/Views/RCTScrollView.m

@@ -44,7 +44,9 @@ CGFloat const ZINDEX_STICKY_HEADER = 50;
                   scrollView:(UIScrollView *)scrollView
                     userData:(NSDictionary *)userData
 {
-  if (self = [super init]) {
+  RCTAssertParam(reactTag);
+
+  if ((self = [super init])) {
     _type = type;
     _viewTag = reactTag;
     _scrollView = scrollView;
@@ -53,6 +55,8 @@ CGFloat const ZINDEX_STICKY_HEADER = 50;
   return self;
 }
 
+RCT_NOT_IMPLEMENTED(-init)
+
 - (uint16_t)coalescingKey
 {
   return 0;
@@ -166,7 +170,7 @@ CGFloat const ZINDEX_STICKY_HEADER = 50;
   return NO;
 }
 
-- (void)handleCustomPan:(UIPanGestureRecognizer *)sender
+- (void)handleCustomPan:(__unused UIPanGestureRecognizer *)sender
 {
   if ([self _shouldDisableScrollInteraction]) {
     self.panGestureRecognizer.enabled = NO;
@@ -181,7 +185,7 @@ CGFloat const ZINDEX_STICKY_HEADER = 50;
   }
 }
 
-- (void)scrollRectToVisible:(CGRect)rect animated:(BOOL)animated
+- (void)scrollRectToVisible:(__unused CGRect)rect animated:(__unused BOOL)animated
 {
   // noop
 }
@@ -228,7 +232,7 @@ CGFloat const ZINDEX_STICKY_HEADER = 50;
  * In order to have this called, you must have delaysContentTouches set to NO
  * (which is the not the `UIKit` default).
  */
-- (BOOL)touchesShouldCancelInContentView:(UIView *)view
+- (BOOL)touchesShouldCancelInContentView:(__unused UIView *)view
 {
   //TODO: shouldn't this call super if _shouldDisableScrollInteraction returns NO?
   return ![self _shouldDisableScrollInteraction];
@@ -265,8 +269,9 @@ CGFloat const ZINDEX_STICKY_HEADER = 50;
   __block UIView *previousHeader = nil;
   __block UIView *currentHeader = nil;
   __block UIView *nextHeader = nil;
-  NSInteger subviewCount = contentView.reactSubviews.count;
+  NSUInteger subviewCount = contentView.reactSubviews.count;
-  [_stickyHeaderIndices enumerateIndexesWithOptions:0 usingBlock:^(NSUInteger idx, BOOL *stop) {
+  [_stickyHeaderIndices enumerateIndexesWithOptions:0 usingBlock:
+   ^(NSUInteger idx, __unused BOOL *stop) {
 
     if (idx >= subviewCount) {
       RCTLogError(@"Sticky header index %zd was outside the range {0, %zd}", idx, subviewCount);
@@ -358,6 +363,8 @@ CGFloat const ZINDEX_STICKY_HEADER = 50;
 
 - (instancetype)initWithEventDispatcher:(RCTEventDispatcher *)eventDispatcher
 {
+  RCTAssertParam(eventDispatcher);
+
   if ((self = [super initWithFrame:CGRectZero])) {
 
     _eventDispatcher = eventDispatcher;
@@ -377,12 +384,15 @@ CGFloat const ZINDEX_STICKY_HEADER = 50;
   return self;
 }
 
+RCT_NOT_IMPLEMENTED(-initWithFrame:(CGRect)frame)
+RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
+
 - (void)setRemoveClippedSubviews:(__unused BOOL)removeClippedSubviews
 {
   // Does nothing
 }
 
-- (void)insertReactSubview:(UIView *)view atIndex:(NSInteger)atIndex
+- (void)insertReactSubview:(UIView *)view atIndex:(__unused NSInteger)atIndex
 {
   RCTAssert(_contentView == nil, @"RCTScrollView may only contain a single subview");
   _contentView = view;
@@ -401,11 +411,21 @@ CGFloat const ZINDEX_STICKY_HEADER = 50;
   return _contentView ? @[_contentView] : @[];
 }
 
+- (BOOL)centerContent
+{
+  return _scrollView.centerContent;
+}
+
 - (void)setCenterContent:(BOOL)centerContent
 {
   _scrollView.centerContent = centerContent;
 }
 
+- (NSIndexSet *)stickyHeaderIndices
+{
+  return _scrollView.stickyHeaderIndices;
+}
+
 - (void)setStickyHeaderIndices:(NSIndexSet *)headerIndices
 {
   RCTAssert(_scrollView.contentSize.width <= self.frame.size.width,
@@ -506,7 +526,8 @@ RCT_SCROLL_EVENT_HANDLER(scrollViewDidZoom, RCTScrollEventTypeMove)
 
     // Calculate changed frames
     NSMutableArray *updatedChildFrames = [[NSMutableArray alloc] init];
-    [[_contentView reactSubviews] enumerateObjectsUsingBlock:^(UIView *subview, NSUInteger idx, BOOL *stop) {
+    [[_contentView reactSubviews] enumerateObjectsUsingBlock:
+     ^(UIView *subview, NSUInteger idx, __unused BOOL *stop) {
 
       // Check if new or changed
       CGRect newFrame = subview.frame;
@@ -589,7 +610,7 @@ RCT_SCROLL_EVENT_HANDLER(scrollViewDidZoom, RCTScrollEventTypeMove)
   return YES;
 }
 
-- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
+- (UIView *)viewForZoomingInScrollView:(__unused UIScrollView *)scrollView
 {
   return _contentView;
 }

React/Views/RCTScrollViewManager.m

@@ -75,7 +75,7 @@ RCT_DEPRECATED_VIEW_PROPERTY(throttleScrollCallbackMS, scrollEventThrottle)
 RCT_EXPORT_METHOD(getContentSize:(NSNumber *)reactTag
                   callback:(RCTResponseSenderBlock)callback)
 {
-  [self.bridge.uiManager addUIBlock:^(RCTUIManager *uiManager, RCTSparseArray *viewRegistry) {
+  [self.bridge.uiManager addUIBlock:^(__unused RCTUIManager *uiManager, RCTSparseArray *viewRegistry) {
 
     UIView *view = viewRegistry[reactTag];
     if (!view) {

React/Views/RCTShadowView.m

@@ -213,7 +213,8 @@ static void RCTProcessMetaProps(const float metaProps[META_PROP_COUNT], float st
   }
 }
 
-- (void)collectRootUpdatedFrames:(NSMutableSet *)viewsWithNewFrame parentConstraint:(CGSize)parentConstraint
+- (void)collectRootUpdatedFrames:(NSMutableSet *)viewsWithNewFrame
+                parentConstraint:(__unused CGSize)parentConstraint
 {
   [self fillCSSNode:_cssNode];
   layoutNode(_cssNode, CSS_UNDEFINED);

React/Views/RCTTabBar.m

@@ -30,8 +30,10 @@
   NSMutableArray *_tabViews;
 }
 
-- (id)initWithEventDispatcher:(RCTEventDispatcher *)eventDispatcher
+- (instancetype)initWithEventDispatcher:(RCTEventDispatcher *)eventDispatcher
 {
+  RCTAssertParam(eventDispatcher);
+
   if ((self = [super initWithFrame:CGRectZero])) {
     _eventDispatcher = eventDispatcher;
     _tabViews = [[NSMutableArray alloc] init];
@@ -42,6 +44,9 @@
   return self;
 }
 
+RCT_NOT_IMPLEMENTED(-initWithFrame:(CGRect)frame)
+RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
+
 - (UIViewController *)backingViewController
 {
   return _tabController;
@@ -105,7 +110,8 @@
     _tabsChanged = NO;
   }
 
-  [[self reactSubviews] enumerateObjectsUsingBlock:^(RCTTabBarItem *tab, NSUInteger index, BOOL *stop) {
+  [[self reactSubviews] enumerateObjectsUsingBlock:
+   ^(RCTTabBarItem *tab, NSUInteger index, __unused BOOL *stop) {
     UIViewController *controller = _tabController.viewControllers[index];
     controller.tabBarItem = tab.barItem;
     if (tab.selected) {
@@ -114,11 +120,21 @@
   }];
 }
 
+- (UIColor *)barTintColor
+{
+  return _tabController.tabBar.barTintColor;
+}
+
 - (void)setBarTintColor:(UIColor *)barTintColor
 {
   _tabController.tabBar.barTintColor = barTintColor;
 }
 
+- (UIColor *)tintColor
+{
+  return _tabController.tabBar.tintColor;
+}
+
 - (void)setTintColor:(UIColor *)tintColor
 {
   _tabController.tabBar.tintColor = tintColor;

React/Views/RCTTextField.m

@@ -24,7 +24,7 @@
 - (instancetype)initWithEventDispatcher:(RCTEventDispatcher *)eventDispatcher
 {
   if ((self = [super initWithFrame:CGRectZero])) {
-
+    RCTAssert(eventDispatcher, @"eventDispatcher is a required parameter");
     _eventDispatcher = eventDispatcher;
     [self addTarget:self action:@selector(_textFieldDidChange) forControlEvents:UIControlEventEditingChanged];
     [self addTarget:self action:@selector(_textFieldBeginEditing) forControlEvents:UIControlEventEditingDidBegin];
@@ -35,6 +35,9 @@
   return self;
 }
 
+RCT_NOT_IMPLEMENTED(-initWithFrame:(CGRect)frame)
+RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
+
 - (void)setText:(NSString *)text
 {
   if (![text isEqualToString:self.text]) {

React/Views/RCTTextFieldManager.m

@@ -43,11 +43,11 @@ RCT_CUSTOM_VIEW_PROPERTY(fontSize, CGFloat, RCTTextField)
 {
   view.font = [RCTConvert UIFont:view.font withSize:json ?: @(defaultView.font.pointSize)];
 }
-RCT_CUSTOM_VIEW_PROPERTY(fontWeight, NSString, RCTTextField)
+RCT_CUSTOM_VIEW_PROPERTY(fontWeight, NSString, __unused RCTTextField)
 {
   view.font = [RCTConvert UIFont:view.font withWeight:json]; // defaults to normal
 }
-RCT_CUSTOM_VIEW_PROPERTY(fontStyle, NSString, RCTTextField)
+RCT_CUSTOM_VIEW_PROPERTY(fontStyle, NSString, __unused RCTTextField)
 {
   view.font = [RCTConvert UIFont:view.font withStyle:json]; // defaults to normal
 }
@@ -60,7 +60,7 @@ RCT_CUSTOM_VIEW_PROPERTY(fontFamily, NSString, RCTTextField)
 {
   NSNumber *reactTag = shadowView.reactTag;
   UIEdgeInsets padding = shadowView.paddingAsInsets;
-  return ^(RCTUIManager *uiManager, RCTSparseArray *viewRegistry) {
+  return ^(__unused RCTUIManager *uiManager, RCTSparseArray *viewRegistry) {
     ((RCTTextField *)viewRegistry[reactTag]).contentInset = padding;
   };
 }

React/Views/RCTView.m

@@ -129,6 +129,8 @@ static NSString *RCTRecursiveAccessibilityLabel(UIView *view)
   return self;
 }
 
+RCT_NOT_IMPLEMENTED(-initWithCoder:unused)
+
 - (NSString *)accessibilityLabel
 {
   if (super.accessibilityLabel) {
@@ -236,10 +238,10 @@ static NSString *RCTRecursiveAccessibilityLabel(UIView *view)
 - (void)react_remountAllSubviews
 {
   if (_reactSubviews) {
-    NSInteger index = 0;
+    NSUInteger index = 0;
     for (UIView *view in _reactSubviews) {
       if (view.superview != self) {
-        if (index < [self subviews].count) {
+        if (index < self.subviews.count) {
           [self insertSubview:view atIndex:index];
         } else {
           [self addSubview:view];

React/Views/RCTViewManager.m

@@ -79,12 +79,12 @@ RCT_EXPORT_MODULE()
   return nil;
 }
 
-- (RCTViewManagerUIBlock)uiBlockToAmendWithShadowView:(RCTShadowView *)shadowView
+- (RCTViewManagerUIBlock)uiBlockToAmendWithShadowView:(__unused RCTShadowView *)shadowView
 {
   return nil;
 }
 
-- (RCTViewManagerUIBlock)uiBlockToAmendWithShadowViewRegistry:(RCTSparseArray *)shadowViewRegistry
+- (RCTViewManagerUIBlock)uiBlockToAmendWithShadowViewRegistry:(__unused RCTSparseArray *)shadowViewRegistry
 {
   return nil;
 }
@@ -169,11 +169,11 @@ RCT_CUSTOM_VIEW_PROPERTY(borderWidth, CGFloat, RCTView)
     view.layer.borderWidth = json ? [RCTConvert CGFloat:json] : defaultView.layer.borderWidth;
   }
 }
-RCT_CUSTOM_VIEW_PROPERTY(onAccessibilityTap, BOOL, RCTView)
+RCT_CUSTOM_VIEW_PROPERTY(onAccessibilityTap, BOOL, __unused RCTView)
 {
   view.accessibilityTapHandler = [self eventHandlerWithName:@"topAccessibilityTap" json:json];
 }
-RCT_CUSTOM_VIEW_PROPERTY(onMagicTap, BOOL, RCTView)
+RCT_CUSTOM_VIEW_PROPERTY(onMagicTap, BOOL, __unused RCTView)
 {
   view.magicTapHandler = [self eventHandlerWithName:@"topMagicTap" json:json];
 }
@@ -239,7 +239,7 @@ RCT_EXPORT_SHADOW_PROPERTY(borderTopWidth, CGFloat)
 RCT_EXPORT_SHADOW_PROPERTY(borderRightWidth, CGFloat)
 RCT_EXPORT_SHADOW_PROPERTY(borderBottomWidth, CGFloat)
 RCT_EXPORT_SHADOW_PROPERTY(borderLeftWidth, CGFloat)
-RCT_CUSTOM_SHADOW_PROPERTY(borderWidth, CGFloat, RCTShadowView) {
+RCT_CUSTOM_SHADOW_PROPERTY(borderWidth, CGFloat, __unused RCTShadowView) {
   [view setBorderWidth:[RCTConvert CGFloat:json]];
 }
 

React/Views/RCTWebView.m

@@ -30,6 +30,8 @@
 
 - (instancetype)initWithEventDispatcher:(RCTEventDispatcher *)eventDispatcher
 {
+  RCTAssertParam(eventDispatcher);
+
   if ((self = [super initWithFrame:CGRectZero])) {
     super.backgroundColor = [UIColor clearColor];
     _automaticallyAdjustContentInsets = YES;
@@ -42,6 +44,9 @@
   return self;
 }
 
+RCT_NOT_IMPLEMENTED(-initWithFrame:(CGRect)frame)
+RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
+
 - (void)goForward
 {
   [_webView goForward];
@@ -57,6 +62,11 @@
   [_webView reload];
 }
 
+- (NSURL *)URL
+{
+  return _webView.request.URL;
+}
+
 - (void)setURL:(NSURL *)URL
 {
   // Because of the way React works, as pages redirect, we actually end up
@@ -68,7 +78,7 @@
   }
   if (!URL) {
     // Clear the webview
-    [_webView loadHTMLString:nil baseURL:nil];
+    [_webView loadHTMLString:@"" baseURL:nil];
     return;
   }
   [_webView loadRequest:[NSURLRequest requestWithURL:URL]];
@@ -128,7 +138,7 @@
 
 static NSString *const RCTJSAJAXScheme = @"react-ajax";
 
-- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request
+- (BOOL)webView:(__unused UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request
  navigationType:(UIWebViewNavigationType)navigationType
 {
   // We have this check to filter out iframe requests and whatnot
@@ -146,7 +156,7 @@ static NSString *const RCTJSAJAXScheme = @"react-ajax";
   return ![request.URL.scheme isEqualToString:RCTJSAJAXScheme];
 }
 
-- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
+- (void)webView:(__unused UIWebView *)webView didFailLoadWithError:(NSError *)error
 {
   if ([error.domain isEqualToString:NSURLErrorDomain] && error.code == NSURLErrorCancelled) {
     // NSURLErrorCancelled is reported when a page has a redirect OR if you load

React/Views/RCTWebViewManager.m

@@ -47,7 +47,7 @@ RCT_EXPORT_VIEW_PROPERTY(shouldInjectAJAXHandler, BOOL);
 
 RCT_EXPORT_METHOD(goBack:(NSNumber *)reactTag)
 {
-  [self.bridge.uiManager addUIBlock:^(RCTUIManager *uiManager, RCTSparseArray *viewRegistry) {
+  [self.bridge.uiManager addUIBlock:^(__unused RCTUIManager *uiManager, RCTSparseArray *viewRegistry) {
     RCTWebView *view = viewRegistry[reactTag];
     if (![view isKindOfClass:[RCTWebView class]]) {
       RCTLogError(@"Invalid view returned from registry, expecting RKWebView, got: %@", view);
@@ -58,7 +58,7 @@ RCT_EXPORT_METHOD(goBack:(NSNumber *)reactTag)
 
 RCT_EXPORT_METHOD(goForward:(NSNumber *)reactTag)
 {
-  [self.bridge.uiManager addUIBlock:^(RCTUIManager *uiManager, RCTSparseArray *viewRegistry) {
+  [self.bridge.uiManager addUIBlock:^(__unused RCTUIManager *uiManager, RCTSparseArray *viewRegistry) {
     id view = viewRegistry[reactTag];
     if (![view isKindOfClass:[RCTWebView class]]) {
       RCTLogError(@"Invalid view returned from registry, expecting RKWebView, got: %@", view);
@@ -70,7 +70,7 @@ RCT_EXPORT_METHOD(goForward:(NSNumber *)reactTag)
 
 RCT_EXPORT_METHOD(reload:(NSNumber *)reactTag)
 {
-  [self.bridge.uiManager addUIBlock:^(RCTUIManager *uiManager, RCTSparseArray *viewRegistry) {
+  [self.bridge.uiManager addUIBlock:^(__unused RCTUIManager *uiManager, RCTSparseArray *viewRegistry) {
     RCTWebView *view = viewRegistry[reactTag];
     if (![view isKindOfClass:[RCTWebView class]]) {
       RCTLogMustFix(@"Invalid view returned from registry, expecting RKWebView, got: %@", view);

React/Views/RCTWrapperViewController.m

@@ -32,7 +32,10 @@
 - (instancetype)initWithContentView:(UIView *)contentView
                     eventDispatcher:(RCTEventDispatcher *)eventDispatcher
 {
-  if (self = [super initWithNibName:nil bundle:nil]) {
+  RCTAssertParam(contentView);
+  RCTAssertParam(eventDispatcher);
+
+  if ((self = [super initWithNibName:nil bundle:nil])) {
     _contentView = contentView;
     _eventDispatcher = eventDispatcher;
     self.automaticallyAdjustsScrollViewInsets = NO;
@@ -43,12 +46,15 @@
 - (instancetype)initWithNavItem:(RCTNavItem *)navItem
                 eventDispatcher:(RCTEventDispatcher *)eventDispatcher
 {
-  if (self = [self initWithContentView:navItem eventDispatcher:eventDispatcher]) {
+  if ((self = [self initWithContentView:navItem eventDispatcher:eventDispatcher])) {
     _navItem = navItem;
   }
   return self;
 }
 
+RCT_NOT_IMPLEMENTED(-initWithNibName:(NSString *)nn bundle:(NSBundle *)nb)
+RCT_NOT_IMPLEMENTED(-initWithCoder:(NSCoder *)aDecoder)
+
 - (void)viewWillLayoutSubviews
 {
   [super viewWillLayoutSubviews];

React/Views/UIView+React.m

@@ -118,7 +118,7 @@
  */
 - (void)reactWillMakeFirstResponder {};
 - (void)reactDidMakeFirstResponder {};
-- (BOOL)reactRespondsToTouch:(UITouch *)touch
+- (BOOL)reactRespondsToTouch:(__unused UITouch *)touch
 {
   return YES;
 }