Enabling AccessibilityInfo.setAccessibilityFocus for MacOS (#450)

* Attempting to add isVoiceOverEnabled to macOS

* Actually completed merge

* Added Tester for SetFocus

* Enabled setFocus

* Clean up console.log

* Cleaned up newline

* merged and cleaned up comments

* Added newlines back in

* Added linting changes

* Moved props into a single line for eslint.

Author: graytmatterMS

Libraries/Components/AccessibilityInfo/AccessibilityInfo.macos.js

@@ -135,7 +135,9 @@ const AccessibilityInfo = {
    * See http://facebook.github.io/react-native/docs/accessibilityinfo.html#setaccessibilityfocus
    */
   setAccessibilityFocus: function(reactTag: number): void {
-    warning(false, 'AccessibilityInfo is not supported on this platform.');
+    if (NativeAccessibilityManager) {
+      NativeAccessibilityManager.setAccessibilityFocus(reactTag);
+    }
   },
 
   /**

RNTester/js/examples/Accessibility/AccessibilityExample.js

@@ -570,6 +570,26 @@ class AnnounceForAccessibility extends React.Component<{}> {
   }
 }
 
+class SetAccessibilityFocus extends React.Component<{}> {
+  _handleOnPress = () => {
+    if (findNodeHandle(this.focusRef.current)) {
+      const reactTag = findNodeHandle(this.focusRef.current);
+      AccessibilityInfo.setAccessibilityFocus(reactTag);
+    }
+  };
+  render() {
+    this.focusRef = React.createRef();
+    return (
+      <View>
+        <Button onPress={this._handleOnPress} title="Set Accessibility Focus" />
+        <Text ref={this.focusRef} accessible={true}>
+          Move focus here on button press.
+        </Text>
+      </View>
+    );
+  }
+}
+
 exports.title = 'Accessibility';
 exports.description = 'Examples of using Accessibility APIs.';
 exports.examples = [
@@ -603,4 +623,10 @@ exports.examples = [
       return <AnnounceForAccessibility />;
     },
   },
+  {
+    title: 'Check if the screen reader focus sets ',
+    render(): React.Element<typeof SetAccessibilityFocus> {
+      return <SetAccessibilityFocus />;
+    },
+  },
 ];

React/Modules/MacOS/RCTAccessibilityManager.m

@@ -54,6 +54,14 @@ - (void)dealloc
   callback(@[ @(isVoiceOverEnabled) ]);
 }
 
+RCT_EXPORT_METHOD(setAccessibilityFocus:(nonnull NSNumber *)reactTag)
+{
+   dispatch_async(dispatch_get_main_queue(), ^{
+    NSView *view = [self.bridge.uiManager viewForReactTag:reactTag];
+    [[view window] makeFirstResponder:view];
+  });
+}
+
 - (void)observeValueForKeyPath:(NSString *)keyPath
                       ofObject:(id)object
                         change:(NSDictionary *)change