Access on/off labels settings for switches on iOS

Author: RtgrV

lib/ui/window.dart

@@ -771,6 +771,7 @@ class AccessibilityFeatures {
   static const int _kBoldTextIndex = 1 << 3;
   static const int _kReduceMotionIndex = 1 << 4;
   static const int _kHighContrastIndex = 1 << 5;
+  static const int _kOnOffSwitchLabelsIndex = 1 << 6;
 
   // A bitfield which represents each enabled feature.
   final int _index;
@@ -803,6 +804,11 @@ class AccessibilityFeatures {
   /// Only supported on iOS.
   bool get highContrast => _kHighContrastIndex & _index != 0;
 
+  /// The platform is requesting to show on/off labels inside switches.
+  ///
+  /// Only supported on iOS.
+  bool get onOffSwitchLabels => _kOnOffSwitchLabelsIndex & _index != 0;
+
   @override
   String toString() {
     final List<String> features = <String>[];
@@ -818,6 +824,8 @@ class AccessibilityFeatures {
       features.add('reduceMotion');
     if (highContrast)
       features.add('highContrast');
+    if (onOffSwitchLabels)
+      features.add('onOffSwitchLabels');
     return 'AccessibilityFeatures$features';
   }
 

lib/ui/window/platform_configuration.h

@@ -35,6 +35,7 @@ enum class AccessibilityFeatureFlag : int32_t {
   kBoldText = 1 << 3,
   kReduceMotion = 1 << 4,
   kHighContrast = 1 << 5,
+  kOnOffSwitchLabels = 1 << 6,
 };
 
 //--------------------------------------------------------------------------

lib/web_ui/lib/window.dart

@@ -148,6 +148,7 @@ class AccessibilityFeatures {
   static const int _kBoldTextIndex = 1 << 3;
   static const int _kReduceMotionIndex = 1 << 4;
   static const int _kHighContrastIndex = 1 << 5;
+  static const int _kOnOffSwitchLabelsIndex = 1 << 6;
 
   // A bitfield which represents each enabled feature.
   final int _index;
@@ -158,6 +159,7 @@ class AccessibilityFeatures {
   bool get boldText => _kBoldTextIndex & _index != 0;
   bool get reduceMotion => _kReduceMotionIndex & _index != 0;
   bool get highContrast => _kHighContrastIndex & _index != 0;
+  bool get onOffSwitchLabels => _kOnOffSwitchLabelsIndex & _index != 0;
 
   @override
   String toString() {
@@ -180,6 +182,9 @@ class AccessibilityFeatures {
     if (highContrast) {
       features.add('highContrast');
     }
+    if (onOffSwitchLabels) {
+      features.add('onOffSwitchLabels');
+    }
     return 'AccessibilityFeatures$features';
   }
 

shell/platform/darwin/ios/framework/Source/FlutterViewController.mm

@@ -331,6 +331,13 @@ - (void)setupNotificationCenterObservers {
                  name:UIAccessibilityDarkerSystemColorsStatusDidChangeNotification
                object:nil];
 
+  if (@available(iOS 13.0, *)) {
+    [center addObserver:self
+               selector:@selector(onAccessibilityStatusChanged:)
+                   name:UIAccessibilityOnOffSwitchLabelsDidChangeNotification
+                 object:nil];
+  }
+
   [center addObserver:self
              selector:@selector(onUserSettingsChanged:)
                  name:UIContentSizeCategoryDidChangeNotification
@@ -1430,6 +1437,11 @@ - (void)onAccessibilityStatusChanged:(NSNotification*)notification {
   if (UIAccessibilityDarkerSystemColorsEnabled()) {
     flags |= static_cast<int32_t>(flutter::AccessibilityFeatureFlag::kHighContrast);
   }
+  if (@available(iOS 13, *)) {
+    if (UIAccessibilityIsOnOffSwitchLabelsEnabled()) {
+      flags |= static_cast<int32_t>(flutter::AccessibilityFeatureFlag::kOnOffSwitchLabels);
+    }
+  }
 #if TARGET_OS_SIMULATOR
   // There doesn't appear to be any way to determine whether the accessibility
   // inspector is enabled on the simulator. We conservatively always turn on the