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Adding support for custom accessibility actions on iOS.

This feature has been requested by customers.  Our previous (pre-react) application had support for custom accessibility actions.

This feature allows UI elements to provide a list of custom actions that can be read when VoiceOver is enabled.  UI elements expose one accessibility action by default.  Some UI elements may support multiple actions though other mechanisms like tap and hold.  To expose these actions in an accessible way iOS provides custom accessibility actions.

Feature was tested in the iOS simulator using the Accessibility Inspector.  Custom actions were added to a button and observed in the tool.  Custom actions were also invoked using the tool and then stepped through in the debugger.

The feature was also tested on an iPhone.  VoiceOver was enabled on the device and custom actions were observed for controls that exposed them.

We have been using this feature in our app for some time as well.

[IOS] [ENHANCEMENT] [Accessibility] - Added support for custom accessibility actions

Eric Davison
Microsoft Corp.
Closes #17020

Differential Revision: D6472283

Pulled By: shergin

fbshipit-source-id: 4ac4697dca07028e87ffe71b70c00280e7f2043c
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ericdavmsft authored and facebook-github-bot committed Dec 5, 2017
1 parent ff3dc2e commit 36ad8138997c195b8728906ceb51bd31338b6a24
@@ -18,6 +18,7 @@ var ReactNativeViewAttributes = {};
ReactNativeViewAttributes.UIView = {
pointerEvents: true,
accessible: true,
accessibilityActions: true,
accessibilityLabel: true,
accessibilityComponentType: true,
accessibilityLiveRegion: true,
@@ -28,6 +29,7 @@ ReactNativeViewAttributes.UIView = {
renderToHardwareTextureAndroid: true,
shouldRasterizeIOS: true,
onLayout: true,
onAccessibilityAction: true,
onAccessibilityTap: true,
onMagicTap: true,
collapsable: true,
@@ -49,11 +49,13 @@ export type ViewLayoutEvent = {
export type ViewProps = {
accessible?: bool,
accessibilityLabel?: React$PropType$Primitive<any>,
accessibilityActions?: Array<string>,
accessibilityComponentType?: AccessibilityComponentType,
accessibilityLiveRegion?: 'none' | 'polite' | 'assertive',
importantForAccessibility?: 'auto'| 'yes'| 'no'| 'no-hide-descendants',
accessibilityTraits?: AccessibilityTrait | Array<AccessibilityTrait>,
accessibilityViewIsModal?: bool,
onAccessibilityAction?: Function,
onAccessibilityTap?: Function,
onMagicTap?: Function,
testID?: string,
@@ -99,6 +101,13 @@ module.exports = {
accessibilityLabel: PropTypes.node,

* Provides an array of custom actions available for accessibility.
* @platform ios
accessibilityActions: PropTypes.arrayOf(PropTypes.string),

* Indicates to accessibility services to treat UI component like a
* native one. Works for Android only.
@@ -165,6 +174,14 @@ module.exports = {
accessibilityViewIsModal: PropTypes.bool,

* When `accessible` is true, the system will try to invoke this function
* when the user performs an accessibility custom action.
* @platform ios
onAccessibilityAction: PropTypes.func,

* When `accessible` is true, the system will try to invoke this function
* when the user performs accessibility tap gesture.
@@ -23,9 +23,15 @@
* Accessibility event handlers
@property (nonatomic, copy) RCTDirectEventBlock onAccessibilityAction;
@property (nonatomic, copy) RCTDirectEventBlock onAccessibilityTap;
@property (nonatomic, copy) RCTDirectEventBlock onMagicTap;

* Accessibility properties
@property (nonatomic, copy) NSArray <NSString *> *accessibilityActions;

* Used to control how touch events are processed.
@@ -156,6 +156,36 @@ - (NSString *)accessibilityLabel
return RCTRecursiveAccessibilityLabel(self);

- (NSArray <UIAccessibilityCustomAction *> *)accessibilityCustomActions
if (!_accessibilityActions.count) {
return nil;

NSMutableArray *actions = [NSMutableArray array];
for (NSString *action in _accessibilityActions) {
[actions addObject:[[UIAccessibilityCustomAction alloc] initWithName:action

return [actions copy];

- (BOOL)didActivateAccessibilityCustomAction:(UIAccessibilityCustomAction *)action
if (!_onAccessibilityAction) {
return NO;

@"target": self.reactTag

return YES;

- (void)setPointerEvents:(RCTPointerEvents)pointerEvents
_pointerEvents = pointerEvents;
@@ -119,9 +119,11 @@ - (RCTViewManagerUIBlock)uiBlockToAmendWithShadowViewRegistry:(__unused NSDictio

// Acessibility related properties
RCT_REMAP_VIEW_PROPERTY(accessible, reactAccessibilityElement.isAccessibilityElement, BOOL)
RCT_REMAP_VIEW_PROPERTY(accessibilityActions, reactAccessibilityElement.accessibilityActions, NSString)
RCT_REMAP_VIEW_PROPERTY(accessibilityLabel, reactAccessibilityElement.accessibilityLabel, NSString)
RCT_REMAP_VIEW_PROPERTY(accessibilityTraits, reactAccessibilityElement.accessibilityTraits, UIAccessibilityTraits)
RCT_REMAP_VIEW_PROPERTY(accessibilityViewIsModal, reactAccessibilityElement.accessibilityViewIsModal, BOOL)
RCT_REMAP_VIEW_PROPERTY(onAccessibilityAction, reactAccessibilityElement.onAccessibilityAction, RCTDirectEventBlock)
RCT_REMAP_VIEW_PROPERTY(onAccessibilityTap, reactAccessibilityElement.onAccessibilityTap, RCTDirectEventBlock)
RCT_REMAP_VIEW_PROPERTY(onMagicTap, reactAccessibilityElement.onMagicTap, RCTDirectEventBlock)
RCT_REMAP_VIEW_PROPERTY(testID, reactAccessibilityElement.accessibilityIdentifier, NSString)

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