Add support for TextInput clearTextOnFocus and selectTextOnFocus (#1517)

* Enable `selectTextOnFocus` and `clearTextOnFocus` for TextInput

* Fix select all for multiline textview

* Only reset selected range for macOS

* Don't run else branch for iOS

* Fix tags

Co-authored-by: Shawn Dempsey <shawndempsey@fb.com>
Co-authored-by: chiuam <67026167+chiuam@users.noreply.github.com>
Co-authored-by: Saad Najmi <sanajmi@microsoft.com>

Libraries/Text/TextInput/Multiline/RCTUITextView.m

@@ -212,6 +212,10 @@ static RCTUIColor *defaultPlaceholderColor() // TODO(OSS Candidate ISS#2710739)
 
 - (BOOL)resignFirstResponder
 {
+  if (self.selectable) {
+    self.selectedRange = NSMakeRange(NSNotFound, 0);
+  }
+
   BOOL success = [super resignFirstResponder];
   
   if (success) {
@@ -436,13 +440,13 @@ static RCTUIColor *defaultPlaceholderColor() // TODO(OSS Candidate ISS#2710739)
 {
   [super selectAll:sender];
 
-#if !TARGET_OS_OSX // TODO(macOS GH#774) For `selectTextOnFocus` prop, which isn't supported on macOS atm.
+#if !TARGET_OS_OSX // TODO(macOS GH#774)
   // `selectAll:` does not work for UITextView when it's being called inside UITextView's delegate methods.
   dispatch_async(dispatch_get_main_queue(), ^{
     UITextRange *selectionRange = [self textRangeFromPosition:self.beginningOfDocument toPosition:self.endOfDocument];
     [self setSelectedTextRange:selectionRange notifyDelegate:NO];
   });
-#endif
+#endif // TODO(macOS GH#774)
 }
 
 #pragma mark - Layout

Libraries/Text/TextInput/RCTBaseTextInputView.m

@@ -379,8 +379,14 @@ RCT_NOT_IMPLEMENTED(- (instancetype)initWithCoder:(NSCoder *)decoder)
   }
 
   if (_selectTextOnFocus) {
+    if ([self.backedTextInputView respondsToSelector:@selector(selectAll:)]) {
       [self.backedTextInputView selectAll:nil];
     }
+#if TARGET_OS_OSX // [TODO(macOS GH#774)
+  } else {
+    [self.backedTextInputView setSelectedTextRange:NSMakeRange(NSNotFound, 0) notifyDelegate:NO];
+#endif // ]TODO(macOS GH#774)
+  }
 
   [_eventDispatcher sendTextEventWithType:RCTTextEventTypeFocus
                                  reactTag:self.reactTag

Libraries/Text/TextInput/RCTBaseTextInputViewManager.m

@@ -56,11 +56,11 @@ RCT_REMAP_NOT_OSX_VIEW_PROPERTY(clearButtonMode, backedTextInputView.clearButton
 RCT_REMAP_NOT_OSX_VIEW_PROPERTY(secureTextEntry, backedTextInputView.secureTextEntry, BOOL) // TODO(macOS GH#774)
 RCT_EXPORT_VIEW_PROPERTY(autoFocus, BOOL)
 RCT_EXPORT_VIEW_PROPERTY(blurOnSubmit, BOOL)
-RCT_EXPORT_NOT_OSX_VIEW_PROPERTY(clearTextOnFocus, BOOL) // TODO(macOS GH#774)
+RCT_EXPORT_VIEW_PROPERTY(clearTextOnFocus, BOOL)
 RCT_REMAP_NOT_OSX_VIEW_PROPERTY(keyboardType, backedTextInputView.keyboardType, UIKeyboardType) // TODO(macOS GH#774)
 RCT_EXPORT_NOT_OSX_VIEW_PROPERTY(showSoftInputOnFocus, BOOL) // TODO(macOS GH#774)
 RCT_EXPORT_VIEW_PROPERTY(maxLength, NSNumber)
-RCT_EXPORT_NOT_OSX_VIEW_PROPERTY(selectTextOnFocus, BOOL) // TODO(macOS GH#774)
+RCT_EXPORT_VIEW_PROPERTY(selectTextOnFocus, BOOL)
 RCT_EXPORT_VIEW_PROPERTY(selection, RCTTextSelection)
 RCT_EXPORT_VIEW_PROPERTY(inputAccessoryViewID, NSString)
 RCT_EXPORT_VIEW_PROPERTY(textContentType, NSString)