Add support for accessibilityRole = "switch"

Summary:
Changelog:
[Internal] - Add support for accessibilityRole = "switch"

Reviewed By: sammy-SC

Differential Revision: D22906500

fbshipit-source-id: 81dfbfd56a24c89ffedc0fde5a63f7bdeed0c5db

React/Fabric/Mounting/ComponentViews/View/RCTViewComponentView.mm

@@ -520,6 +520,15 @@ static NSString *RCTRecursiveAccessibilityLabel(UIView *view)
 {
   auto const &props = *std::static_pointer_cast<ViewProps const>(_props);
 
+  // Handle Switch.
+  if ((self.accessibilityTraits & AccessibilityTraitSwitch) == AccessibilityTraitSwitch) {
+    if (props.accessibilityState.checked == AccessibilityState::Checked) {
+      return @"1";
+    } else if (props.accessibilityState.checked == AccessibilityState::Unchecked) {
+      return @"0";
+    }
+  }
+
   // Handle states which haven't already been handled.
   if (props.accessibilityState.checked == AccessibilityState::Checked) {
     return @"checked";

React/Fabric/RCTConversions.h

@@ -71,6 +71,8 @@ inline UIEdgeInsets RCTUIEdgeInsetsFromEdgeInsets(const facebook::react::EdgeIns
   return {edgeInsets.top, edgeInsets.left, edgeInsets.bottom, edgeInsets.right};
 }
 
+UIAccessibilityTraits const AccessibilityTraitSwitch = 0x20000000000001;
+
 inline UIAccessibilityTraits RCTUIAccessibilityTraitsFromAccessibilityTraits(
     facebook::react::AccessibilityTraits accessibilityTraits)
 {
@@ -124,6 +126,9 @@ inline UIAccessibilityTraits RCTUIAccessibilityTraitsFromAccessibilityTraits(
   if ((accessibilityTraits & AccessibilityTraits::Header) != AccessibilityTraits::None) {
     result |= UIAccessibilityTraitHeader;
   }
+  if ((accessibilityTraits & AccessibilityTraits::Switch) != AccessibilityTraits::None) {
+    result |= AccessibilityTraitSwitch;
+  }
   return result;
 };
 

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

@@ -30,6 +30,7 @@ enum class AccessibilityTraits : uint32_t {
   AllowsDirectInteraction = (1 << 13),
   CausesPageTurn = (1 << 14),
   Header = (1 << 15),
+  Switch = (1 << 16),
 };
 
 constexpr enum AccessibilityTraits operator|(

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

@@ -87,7 +87,10 @@ inline void fromString(const std::string &string, AccessibilityTraits &result) {
     result = AccessibilityTraits::SummaryElement;
     return;
   }
-
+  if (string == "switch") {
+    result = AccessibilityTraits::Switch;
+    return;
+  }
   result = AccessibilityTraits::None;
 }