Implemented AccessibilityInfo.announceForAccessibility (#470)

* Attempting to add isVoiceOverEnabled to macOS

* Dealt with merge conflicts

* Cleaned bad tab

* removed comments

* Enabled announceForAccessibility

* removed console.log

* Removed unrelated changes

* Removed last unrelated changes

Author: graytmatterMS

Libraries/Components/AccessibilityInfo/AccessibilityInfo.macos.js

@@ -188,7 +188,9 @@ const AccessibilityInfo = {
    * See http://facebook.github.io/react-native/docs/accessibilityinfo.html#announceforaccessibility
    */
   announceForAccessibility: function(announcement: string): void {
-    warning(false, 'AccessibilityInfo is not supported on this platform.');
+    if (NativeAccessibilityManager) {
+      NativeAccessibilityManager.announceForAccessibility(announcement);
+    }
   },
 };
 

React/Modules/MacOS/RCTAccessibilityManager.m

@@ -53,7 +53,18 @@ - (void)dealloc
   [[NSWorkspace sharedWorkspace] removeObserver:self
                                      forKeyPath:@"voiceOverEnabled"
                                         context:AccessibilityVoiceOverChangeContext];
-   [[[NSWorkspace sharedWorkspace] notificationCenter] removeObserver:self]; 
+  [[[NSWorkspace sharedWorkspace] notificationCenter] removeObserver:self]; 
+}
+
+RCT_EXPORT_METHOD(announceForAccessibility:(NSString *)announcement)
+{
+    NSAccessibilityPostNotificationWithUserInfo(
+                                                    NSApp,
+                                                    NSAccessibilityAnnouncementRequestedNotification,
+                                                    @{NSAccessibilityAnnouncementKey : announcement,
+                                                      NSAccessibilityPriorityKey : @(NSAccessibilityPriorityHigh)
+                                                    }
+                                                );
 }
 
 RCT_EXPORT_METHOD(getCurrentInvertColorsState:(RCTResponseSenderBlock)callback

React/Modules/RCTAccessibilityManager.m

@@ -342,4 +342,3 @@ - (RCTAccessibilityManager *)accessibilityManager
 }
 
 @end
-