Add support for the UIAccessibilityTraitsTabBar

Summary:
Changelog:
Add the capability to set tabbar accessibilityRole which maps to the iOS's UIAccessibilityTraitsTabBar

Reviewed By: yungsters

Differential Revision: D30490752

fbshipit-source-id: f7561a8932306e133d2f65a5ab40ba0be3899ec3

Libraries/Components/View/ViewAccessibility.js

@@ -39,6 +39,7 @@ export type AccessibilityRole =
   | 'spinbutton'
   | 'switch'
   | 'tab'
+  | 'tabbar'
   | 'tablist'
   | 'timer'
   | 'list'

React/Fabric/RCTConversions.h

@@ -141,6 +141,9 @@ inline UIAccessibilityTraits RCTUIAccessibilityTraitsFromAccessibilityTraits(
   if ((accessibilityTraits & AccessibilityTraits::Switch) != AccessibilityTraits::None) {
     result |= AccessibilityTraitSwitch;
   }
+  if ((accessibilityTraits & AccessibilityTraits::TabBar) != AccessibilityTraits::None) {
+    result |= UIAccessibilityTraitTabBar;
+  }
   return result;
 };
 

React/Views/RCTViewManager.m

@@ -58,6 +58,7 @@ @implementation RCTConvert (UIAccessibilityTraits)
       @"spinbutton" : @(UIAccessibilityTraitNone),
       @"switch" : @(SwitchAccessibilityTrait),
       @"tab" : @(UIAccessibilityTraitNone),
+      @"tabbar" : @(UIAccessibilityTraitTabBar),
       @"tablist" : @(UIAccessibilityTraitNone),
       @"timer" : @(UIAccessibilityTraitNone),
       @"toolbar" : @(UIAccessibilityTraitNone),

ReactCommon/react/renderer/attributedstring/conversions.h

@@ -618,6 +618,8 @@ inline std::string toString(const AccessibilityRole &accessibilityRole) {
       return "switch";
     case AccessibilityRole::Tab:
       return "tab";
+    case AccessibilityRole::TabBar:
+      return "tabbar";
     case AccessibilityRole::Tablist:
       return "tablist";
     case AccessibilityRole::Timer:
@@ -687,6 +689,8 @@ inline void fromRawValue(
       result = AccessibilityRole::Switch;
     } else if (string == "tab") {
       result = AccessibilityRole::Tab;
+    } else if (string == "tabbar") {
+      result = AccessibilityRole::TabBar;
     } else if (string == "tablist") {
       result = AccessibilityRole::Tablist;
     } else if (string == "timer") {

ReactCommon/react/renderer/attributedstring/primitives.h

@@ -112,6 +112,7 @@ enum class AccessibilityRole {
   Spinbutton,
   Switch,
   Tab,
+  TabBar,
   Tablist,
   Timer,
   Toolbar,

ReactCommon/react/renderer/components/view/AccessibilityPrimitives.h

@@ -33,6 +33,7 @@ enum class AccessibilityTraits : uint32_t {
   CausesPageTurn = (1 << 14),
   Header = (1 << 15),
   Switch = (1 << 16),
+  TabBar = (1 << 17),
 };
 
 constexpr enum AccessibilityTraits operator|(

ReactCommon/react/renderer/components/view/accessibilityPropsConversions.h

@@ -94,6 +94,10 @@ inline void fromString(const std::string &string, AccessibilityTraits &result) {
     result = AccessibilityTraits::Switch;
     return;
   }
+  if (string == "tabbar") {
+    result = AccessibilityTraits::TabBar;
+    return;
+  }
   result = AccessibilityTraits::None;
 }
 

ReactCommon/react/renderer/textlayoutmanager/platform/ios/RCTAttributedTextUtils.mm

@@ -288,6 +288,9 @@ inline static CGFloat RCTEffectiveFontSizeMultiplierFromTextAttributes(const Tex
       case AccessibilityRole::Tab:
         attributes[RCTTextAttributesAccessibilityRoleAttributeName] = @("tab");
         break;
+      case AccessibilityRole::TabBar:
+        attributes[RCTTextAttributesAccessibilityRoleAttributeName] = @("tabbar");
+        break;
       case AccessibilityRole::Tablist:
         attributes[RCTTextAttributesAccessibilityRoleAttributeName] = @("tablist");
         break;