Introducing `[RCTUIManager _executeBlockWithShadowView:forTag:]`

Summary:
New super simple abstraction in RCTUIManager.
Nothing really changed and RCTUIManager became shorter.

Reviewed By: rsnara

Differential Revision: D5990342

fbshipit-source-id: b38397b789a999168ac14625585065eda73d328f

React/Modules/RCTUIManager.h

@@ -86,7 +86,7 @@ RCT_EXTERN NSString *const RCTUIManagerWillUpdateViewsDueToContentSizeMultiplier
  * Use `UIViewNoIntrinsicMetric` to ignore a dimension.
  * The `size` must NOT include padding and border.
  */
-- (void)setIntrinsicContentSize:(CGSize)size forView:(UIView *)view;
+- (void)setIntrinsicContentSize:(CGSize)intrinsicContentSize forView:(UIView *)view;
 
 /**
  * Update the background color of a view. The source of truth for

React/Modules/RCTUIManager.m

@@ -327,39 +327,46 @@ static NSDictionary *deviceOrientationEventBody(UIDeviceOrientation orientation)
   return _shadowViewRegistry[reactTag];
 }
 
-- (void)setAvailableSize:(CGSize)availableSize forRootView:(UIView *)rootView
+- (void)_executeBlockWithShadowView:(void (^)(RCTShadowView *shadowView))block forTag:(NSNumber *)tag
 {
   RCTAssertMainQueue();
-  NSNumber *reactTag = rootView.reactTag;
-  RCTExecuteOnUIManagerQueue(^{
-    RCTRootShadowView *shadowView = (RCTRootShadowView *)self->_shadowViewRegistry[reactTag];
-    RCTAssert(shadowView != nil, @"Could not locate shadow view with tag #%@", reactTag);
-    RCTAssert([shadowView isKindOfClass:[RCTRootShadowView class]], @"Located shadow view (with tag #%@) is actually not root view.", reactTag);
 
-    if (CGSizeEqualToSize(availableSize, shadowView.availableSize)) {
+  RCTExecuteOnUIManagerQueue(^{
+    RCTShadowView *shadowView = self->_shadowViewRegistry[tag];
+
+    if (shadowView == nil) {
+      RCTLogInfo(@"Could not locate shadow view with tag #%@, this is probably caused by a temporary inconsistency between native views and shadow views.", tag);
       return;
     }
 
-    shadowView.availableSize = availableSize;
-    [self setNeedsLayout];
+    block(shadowView);
   });
 }
 
+- (void)setAvailableSize:(CGSize)availableSize forRootView:(UIView *)rootView
+{
+  RCTAssertMainQueue();
+  [self _executeBlockWithShadowView:^(RCTShadowView *shadowView) {
+    RCTAssert([shadowView isKindOfClass:[RCTRootShadowView class]], @"Located shadow view is actually not root view.");
+
+    RCTRootShadowView *rootShadowView = (RCTRootShadowView *)shadowView;
+
+    if (CGSizeEqualToSize(availableSize, rootShadowView.availableSize)) {
+      return;
+    }
+
+    rootShadowView.availableSize = availableSize;
+    [self setNeedsLayout];
+  } forTag:rootView.reactTag];
+}
+
 - (void)setLocalData:(NSObject *)localData forView:(UIView *)view
 {
   RCTAssertMainQueue();
-  NSNumber *tag = view.reactTag;
-
-  RCTExecuteOnUIManagerQueue(^{
-    RCTShadowView *shadowView = self->_shadowViewRegistry[tag];
-    if (shadowView == nil) {
-      RCTLogWarn(@"Could not locate shadow view with tag #%@, this is probably caused by a temporary inconsistency between native views and shadow views.", tag);
-      return;
-    }
-
+  [self _executeBlockWithShadowView:^(RCTShadowView *shadowView) {
     shadowView.localData = localData;
     [self setNeedsLayout];
-  });
+  } forTag:view.reactTag];
 }
 
 /**
@@ -392,56 +399,40 @@ static NSDictionary *deviceOrientationEventBody(UIDeviceOrientation orientation)
 - (void)setSize:(CGSize)size forView:(UIView *)view
 {
   RCTAssertMainQueue();
-
-  NSNumber *reactTag = view.reactTag;
-  RCTExecuteOnUIManagerQueue(^{
-    RCTShadowView *shadowView = self->_shadowViewRegistry[reactTag];
-    RCTAssert(shadowView != nil, @"Could not locate shadow view with tag #%@", reactTag);
-
+  [self _executeBlockWithShadowView:^(RCTShadowView *shadowView) {
     if (CGSizeEqualToSize(size, shadowView.size)) {
       return;
     }
 
     shadowView.size = size;
     [self setNeedsLayout];
-  });
+  } forTag:view.reactTag];
 }
 
-- (void)setIntrinsicContentSize:(CGSize)size forView:(UIView *)view
+- (void)setIntrinsicContentSize:(CGSize)intrinsicContentSize forView:(UIView *)view
 {
   RCTAssertMainQueue();
-
-  NSNumber *reactTag = view.reactTag;
-  RCTExecuteOnUIManagerQueue(^{
-    RCTShadowView *shadowView = self->_shadowViewRegistry[reactTag];
-    if (shadowView == nil) {
-      RCTLogWarn(@"Could not locate shadow view with tag #%@, this is probably caused by a temporary inconsistency between native views and shadow views.", reactTag);
+  [self _executeBlockWithShadowView:^(RCTShadowView *shadowView) {
+    if (CGSizeEqualToSize(shadowView.intrinsicContentSize, intrinsicContentSize)) {
       return;
-    }    
-
-    if (!CGSizeEqualToSize(shadowView.intrinsicContentSize, size)) {
-      shadowView.intrinsicContentSize = size;
-      [self setNeedsLayout];
     }
-  });
+
+    shadowView.intrinsicContentSize = intrinsicContentSize;
+  } forTag:view.reactTag];
 }
 
 - (void)setBackgroundColor:(UIColor *)color forView:(UIView *)view
 {
   RCTAssertMainQueue();
-
-  NSNumber *reactTag = view.reactTag;
-  RCTExecuteOnUIManagerQueue(^{
+  [self _executeBlockWithShadowView:^(RCTShadowView *shadowView) {
     if (!self->_viewRegistry) {
       return;
     }
 
-    RCTShadowView *shadowView = self->_shadowViewRegistry[reactTag];
-    RCTAssert(shadowView != nil, @"Could not locate root view with tag #%@", reactTag);
     shadowView.backgroundColor = color;
     [self _amendPendingUIBlocksWithStylePropagationUpdateForShadowView:shadowView];
     [self flushUIBlocks];
-  });
+  } forTag:view.reactTag];
 }
 
 /**