removed tabbar for iOS 9 compatibility issues

Summary: Removed Accessibility Trait TabBar for iOS compatibility Issues, since tabbar is only available on iOS 10+

Reviewed By: PeteTheHeat

Differential Revision: D8822469

fbshipit-source-id: 34bf00eb930f631a5a4effa0a4159da07c1573f6

Author: Ziqi Chen

Libraries/Components/View/ViewAccessibility.js

@@ -44,8 +44,7 @@ export type AccessibilityRole =
   | 'button'
   | 'image'
   | 'keyboardkey'
-  | 'text'
-  | 'tabbar';
+  | 'text';
 
 module.exports = {
   AccessibilityTraits: [
@@ -79,6 +78,5 @@ module.exports = {
     'image',
     'keyboardkey',
     'text',
-    'tabbar',
   ],
 };

React/Views/RCTViewManager.m

@@ -33,7 +33,6 @@ @implementation RCTConvert(UIAccessibilityTraits)
   @"header": @(UIAccessibilityTraitHeader),
   @"search": @(UIAccessibilityTraitSearchField),
   @"image": @(UIAccessibilityTraitImage),
-  @"tabbar": @(UIAccessibilityTraitTabBar),
   @"selected": @(UIAccessibilityTraitSelected),
   @"plays": @(UIAccessibilityTraitPlaysSound),
   @"key": @(UIAccessibilityTraitKeyboardKey),

ReactAndroid/src/main/java/com/facebook/react/uimanager/AccessibilityRoleUtil.java

@@ -33,8 +33,7 @@ public enum AccessibilityRole {
     BUTTON("android.widget.Button"),
     IMAGE("android.widget.ImageView"),
     KEYBOARD_KEY("android.inputmethodservice.Keyboard$Key"),
-    TEXT("android.widget.ViewGroup"),
-    TAB_BAR("android.widget.TabWidget");
+    TEXT("android.widget.ViewGroup");
 
     @Nullable private final String mValue;
 
@@ -90,7 +89,6 @@ public static void setRole(AccessibilityNodeInfoCompat nodeInfo, final Accessibi
   private static final String IMAGE = "image";
   private static final String KEYBOARDKEY = "keyboardkey";
   private static final String TEXT = "text";
-  private static final String TABBAR = "tabbar";
 
   public static void updateAccessibilityRole(View view, String role) {
     if (role == null) {
@@ -111,9 +109,6 @@ public static void updateAccessibilityRole(View view, String role) {
       case TEXT:
         setRole(view, AccessibilityRoleUtil.AccessibilityRole.TEXT);
         break;
-      case TABBAR:
-        setRole(view, AccessibilityRoleUtil.AccessibilityRole.TAB_BAR);
-        break;
       default:
         view.setAccessibilityDelegate(null);
     }