[#1451] Add support for UIAccessibilityCustomAction (#1452)

This PR adds support for UIAccessibilityCustomAction propagation through ASPendingState so that it can be picked up by VoiceOver.

Author: shamanskyh

Source/ASDisplayNode.h

@@ -799,6 +799,7 @@ AS_EXTERN NSInteger const ASDefaultDrawingPriority;
 @property           BOOL accessibilityViewIsModal;
 @property           BOOL shouldGroupAccessibilityChildren;
 @property           UIAccessibilityNavigationStyle accessibilityNavigationStyle;
+@property (nullable, copy)   NSArray *accessibilityCustomActions API_AVAILABLE(ios(8.0),tvos(9.0));
 #if TARGET_OS_TV
 @property (nullable, copy) 	NSArray *accessibilityHeaderElements;
 #endif

Source/Private/ASDisplayNode+UIViewBridge.mm

@@ -1256,6 +1256,20 @@ - (UIAccessibilityNavigationStyle)accessibilityNavigationStyle
   return _getAccessibilityFromViewOrProperty(_accessibilityNavigationStyle, accessibilityNavigationStyle);
 }
 
+#if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_8_0
+- (void)setAccessibilityCustomActions:(NSArray *)accessibilityCustomActions
+{
+  _bridge_prologue_write;
+  _setAccessibilityToViewAndProperty(_accessibilityCustomActions, accessibilityCustomActions, accessibilityCustomActions, accessibilityCustomActions);
+}
+
+- (NSArray *)accessibilityCustomActions
+{
+  _bridge_prologue_read;
+  return _getAccessibilityFromViewOrProperty(_accessibilityCustomActions, accessibilityCustomActions);
+}
+#endif
+
 #if TARGET_OS_TV
 - (void)setAccessibilityHeaderElements:(NSArray *)accessibilityHeaderElements
 {

Source/Private/ASDisplayNodeInternal.h

@@ -240,6 +240,7 @@ static constexpr CACornerMask kASCACornerAllCorners =
   BOOL _shouldGroupAccessibilityChildren;
   NSString *_accessibilityIdentifier;
   UIAccessibilityNavigationStyle _accessibilityNavigationStyle;
+  NSArray *_accessibilityCustomActions;
   NSArray *_accessibilityHeaderElements;
   CGPoint _accessibilityActivationPoint;
   UIBezierPath *_accessibilityPath;

Source/Private/_ASPendingState.mm

@@ -79,6 +79,7 @@
   int setShouldGroupAccessibilityChildren:1;
   int setAccessibilityIdentifier:1;
   int setAccessibilityNavigationStyle:1;
+  int setAccessibilityCustomActions:1;
   int setAccessibilityHeaderElements:1;
   int setAccessibilityActivationPoint:1;
   int setAccessibilityPath:1;
@@ -139,6 +140,7 @@ @implementation _ASPendingState
   BOOL shouldGroupAccessibilityChildren;
   NSString *accessibilityIdentifier;
   UIAccessibilityNavigationStyle accessibilityNavigationStyle;
+  NSArray *accessibilityCustomActions;
   NSArray *accessibilityHeaderElements;
   CGPoint accessibilityActivationPoint;
   UIBezierPath *accessibilityPath;
@@ -285,6 +287,7 @@ - (instancetype)init
   shouldGroupAccessibilityChildren = NO;
   accessibilityIdentifier = nil;
   accessibilityNavigationStyle = UIAccessibilityNavigationStyleAutomatic;
+  accessibilityCustomActions = nil;
   accessibilityHeaderElements = nil;
   accessibilityActivationPoint = CGPointZero;
   accessibilityPath = nil;
@@ -787,6 +790,19 @@ - (void)setAccessibilityNavigationStyle:(UIAccessibilityNavigationStyle)newAcces
   accessibilityNavigationStyle = newAccessibilityNavigationStyle;
 }
 
+- (NSArray *)accessibilityCustomActions
+{
+  return accessibilityCustomActions;
+}
+
+- (void)setAccessibilityCustomActions:(NSArray *)newAccessibilityCustomActions
+{
+  _flags.setAccessibilityCustomActions = YES;
+  if (accessibilityCustomActions != newAccessibilityCustomActions) {
+    accessibilityCustomActions = [newAccessibilityCustomActions copy];
+  }
+}
+
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wdeprecated-implementations"
 - (NSArray *)accessibilityHeaderElements
@@ -1139,7 +1155,13 @@ - (void)applyToView:(UIView *)view withSpecialPropertiesHandling:(BOOL)specialPr
 
   if (flags.setAccessibilityNavigationStyle)
     view.accessibilityNavigationStyle = accessibilityNavigationStyle;
-  
+
+  if (AS_AVAILABLE_IOS_TVOS(8, 9)) {
+    if (flags.setAccessibilityCustomActions) {
+      view.accessibilityCustomActions = accessibilityCustomActions;
+    }
+  }
+
 #if TARGET_OS_TV
   if (flags.setAccessibilityHeaderElements)
     view.accessibilityHeaderElements = accessibilityHeaderElements;
@@ -1278,6 +1300,11 @@ + (_ASPendingState *)pendingViewStateFromView:(UIView *)view
   pendingState.shouldGroupAccessibilityChildren = view.shouldGroupAccessibilityChildren;
   pendingState.accessibilityIdentifier = view.accessibilityIdentifier;
   pendingState.accessibilityNavigationStyle = view.accessibilityNavigationStyle;
+#if __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_8_0
+  if (AS_AVAILABLE_IOS_TVOS(8, 9)) {
+    pendingState.accessibilityCustomActions = view.accessibilityCustomActions;
+  }
+#endif
 #if TARGET_OS_TV
   pendingState.accessibilityHeaderElements = view.accessibilityHeaderElements;
 #endif

Tests/ASDisplayNodeTests.mm

@@ -498,6 +498,7 @@ - (void)checkValuesMatchDefaults:(ASDisplayNode *)node isLayerBacked:(BOOL)isLay
   XCTAssertEqual(NO, node.accessibilityElementsHidden, @"default accessibilityElementsHidden is broken %@", hasLoadedView);
   XCTAssertEqual(NO, node.accessibilityViewIsModal, @"default accessibilityViewIsModal is broken %@", hasLoadedView);
   XCTAssertEqual(NO, node.shouldGroupAccessibilityChildren, @"default shouldGroupAccessibilityChildren is broken %@", hasLoadedView);
+  XCTAssertEqual((id)nil, node.accessibilityCustomActions, @"default acccessibilityCustomActions is broken %@", hasLoadedView);
 
   if (!isLayerBacked) {
     XCTAssertEqual(YES, node.userInteractionEnabled, @"default userInteractionEnabled broken %@", hasLoadedView);
@@ -554,6 +555,12 @@ - (UIImage *)bogusImage
   return bogusImage;
 }
 
+- (BOOL)dummySelector
+{
+  // no-op; only used for testing of UIAccessibilityCustomAction propagation
+  return YES;
+}
+
 - (void)checkValuesMatchSetValues:(ASDisplayNode *)node isLayerBacked:(BOOL)isLayerBacked
 {
   NSString *targetName = isLayerBacked ? @"layer" : @"view";
@@ -608,6 +615,11 @@ - (void)checkValuesMatchSetValues:(ASDisplayNode *)node isLayerBacked:(BOOL)isLa
   XCTAssertEqual(YES, node.accessibilityViewIsModal, @"accessibilityViewIsModal broken %@", hasLoadedView);
   XCTAssertEqual(YES, node.shouldGroupAccessibilityChildren, @"shouldGroupAccessibilityChildren broken %@", hasLoadedView);
   XCTAssertEqual(UIAccessibilityNavigationStyleSeparate, node.accessibilityNavigationStyle, @"accessibilityNavigationStyle broken %@", hasLoadedView);
+  if (AS_AVAILABLE_IOS_TVOS(8, 9)) {
+    XCTAssertNotNil(node.accessibilityCustomActions, @"accessibilityCustomActions broken %@", hasLoadedView);
+    XCTAssertEqualObjects(@"custom action", ((UIAccessibilityCustomAction *)(node.accessibilityCustomActions.firstObject)).name, @"accessibilityCustomActions broken %@", hasLoadedView);
+  }
+
   XCTAssertTrue(CGPointEqualToPoint(CGPointMake(1.0, 1.0), node.accessibilityActivationPoint), @"accessibilityActivationPoint broken %@", hasLoadedView);
   XCTAssertNotNil(node.accessibilityPath, @"accessibilityPath broken %@", hasLoadedView);
 
@@ -679,6 +691,9 @@ - (void)checkSimpleBridgePropertiesSetPropagate:(BOOL)isLayerBacked
     node.accessibilityViewIsModal = YES;
     node.shouldGroupAccessibilityChildren = YES;
     node.accessibilityNavigationStyle = UIAccessibilityNavigationStyleSeparate;
+    if (AS_AVAILABLE_IOS_TVOS(8, 9)) {
+      node.accessibilityCustomActions = @[ [[UIAccessibilityCustomAction alloc] initWithName:@"custom action" target:self selector:@selector(dummySelector)] ];
+    }
     node.accessibilityActivationPoint = CGPointMake(1.0, 1.0);
     node.accessibilityPath = [UIBezierPath bezierPath];