[React Native] Add magic tap accessibility gesture

Libraries/Components/View/View.js

@@ -98,6 +98,13 @@ var View = React.createClass({
       PropTypes.oneOf(AccessibilityTraits),
       PropTypes.arrayOf(PropTypes.oneOf(AccessibilityTraits)),
     ]),
+
+    /**
+     * When `accessible` is true, the system will invoke this function when the
+     * user performs the magic tap gesture.
+     */
+    onMagicTap: PropTypes.func,
+
     /**
      * Used to locate this view in end-to-end tests.
      */

Libraries/ReactNative/ReactNativeViewAttributes.js

@@ -22,6 +22,7 @@ ReactNativeViewAttributes.UIView = {
   accessibilityTraits: true,
   testID: true,
   onLayout: true,
+  onMagicTap: true,
 };
 
 ReactNativeViewAttributes.RCTView = merge(

React/Modules/RCTUIManager.m

@@ -1309,6 +1309,9 @@ RCT_EXPORT_METHOD(clearJSResponder)
     @"topLoadingError": @{
       @"registrationName": @"onLoadingError"
     },
+    @"topMagicTap": @{
+      @"registrationName": @"onMagicTap"
+    },
   } mutableCopy];
 
   [_viewManagers enumerateKeysAndObjectsUsingBlock:^(NSString *name, RCTViewManager *manager, BOOL *stop) {

React/Views/RCTView.h

@@ -15,8 +15,13 @@
 
 @protocol RCTAutoInsetsProtocol;
 
+@class RCTView;
+typedef void (^RCTViewMagicTapHandler)(RCTView *view);
+
 @interface RCTView : UIView
 
+@property (nonatomic, copy) RCTViewMagicTapHandler magicTapHandler;
+
 /**
  * Used to control how touch events are processed.
  */

React/Views/RCTView.m

@@ -167,6 +167,16 @@ static NSString *RCTRecursiveAccessibilityLabel(UIView *view)
   }
 }
 
+- (BOOL)accessibilityPerformMagicTap
+{
+  if (self.magicTapHandler) {
+    self.magicTapHandler(self);
+    return YES;
+  } else {
+    return NO;
+  }
+}
+
 #pragma mark - Statics for dealing with layoutGuides
 
 + (void)autoAdjustInsetsForView:(UIView<RCTAutoInsetsProtocol> *)parentView

React/Views/RCTViewManager.m

@@ -17,6 +17,7 @@
 #import "RCTUIManager.h"
 #import "RCTUtils.h"
 #import "RCTView.h"
+#import "UIView+React.h"
 
 @implementation RCTConvert(UIAccessibilityTraits)
 
@@ -171,6 +172,19 @@ RCT_CUSTOM_VIEW_PROPERTY(borderWidth, CGFloat, RCTView)
     view.layer.borderWidth = json ? [RCTConvert CGFloat:json] : defaultView.layer.borderWidth;
   }
 }
+RCT_CUSTOM_VIEW_PROPERTY(onMagicTap, BOOL, RCTView)
+{
+  RCTViewMagicTapHandler handler = nil;
+  if ([RCTConvert BOOL:json]) {
+    __weak RCTViewManager *weakSelf = self;
+    handler = ^(RCTView *tappedView) {
+      NSDictionary *body = @{ @"target": tappedView.reactTag };
+      [weakSelf.bridge.eventDispatcher sendInputEventWithName:@"topMagicTap" body:body];
+    };
+  }
+
+  view.magicTapHandler = handler;
+}
 
 #define RCT_VIEW_BORDER_PROPERTY(SIDE)                                  \
 RCT_CUSTOM_VIEW_PROPERTY(border##SIDE##Width, CGFloat, RCTView)         \