[iOS] RadioButton a11y

src/Controls/samples/Controls.Sample/Pages/Controls/RadioButtonGalleries/ContentProperties.xaml

@@ -43,6 +43,22 @@
 
  </RadioButton>
 
+ <Label FontSize="Small" Text="The RadioButton below is the same as above, but also has a Semantic Description set on it for better accessibility."/>
+
+ <RadioButton GroupName="test"
+ SemanticProperties.Description="{Binding Source={x:Reference embeddedButton}, Path=Text}"
+ TextColor="Green"
+ TextTransform="Uppercase"
+ FontAttributes="Bold"
+ FontSize="12"
+ FontFamily="Arial">
+
+ <RadioButton.Content>
+ <Button x:Name="embeddedButton" Text="It's a button inside a button." TextColor="Green"></Button>
+ </RadioButton.Content>
+
+ </RadioButton>
+
  <Label FontSize="Small" Text="A Content View which already has these properties set/bound should ignore the RadioButton properties."/>
 
  <RadioButton GroupName="test" 

src/Controls/src/Core/HandlerImpl/RadioButton/RadioButton.Impl.cs

@@ -19,5 +19,21 @@ public partial class RadioButton : IRadioButton
  Color IButtonStroke.StrokeColor => (Color)GetValue(BorderColorProperty);
 
  int IButtonStroke.CornerRadius => (int)GetValue(CornerRadiusProperty);
+
+ Semantics _semantics;
+
+ Semantics IView.Semantics
+ {
+ get
+ {
+ if (ControlTemplate != null)
+ {
+ _semantics ??= new Semantics();
+ _semantics.Description = SemanticProperties.GetDescription(this) ?? this.ContentAsString();
+ }
+
+ return _semantics;
+ }
+ }
  }
 }

src/Core/src/Handlers/RadioButton/RadioButtonHandler.iOS.cs

@@ -9,11 +9,7 @@ protected override ContentView CreatePlatformView()
  _ = VirtualView ?? throw new InvalidOperationException($"{nameof(VirtualView)} must be set to create a {nameof(ContentView)}");
  _ = MauiContext ?? throw new InvalidOperationException($"{nameof(MauiContext)} cannot be null");
 
- return new ContentView
- {
- CrossPlatformMeasure = VirtualView.CrossPlatformMeasure,
- CrossPlatformArrange = VirtualView.CrossPlatformArrange
- };
+ return new MauiRadioButton(VirtualView);
  }
 
  public override void SetVirtualView(IView view)

src/Core/src/Platform/iOS/MauiRadioButton.cs

@@ -0,0 +1,48 @@
+using System;
+using CoreGraphics;
+using Microsoft.Maui.Graphics;
+using ObjCRuntime;
+using UIKit;
+
+namespace Microsoft.Maui.Platform;
+
+internal class MauiRadioButton : ContentView
+{
+ IRadioButton _radioButton;
+ UIAccessibilityTrait _accessibilityTraits;
+
+ internal MauiRadioButton(IRadioButton virtualView)
+ {
+ _radioButton = virtualView;
+ CrossPlatformMeasure = virtualView.CrossPlatformMeasure;
+ CrossPlatformArrange = virtualView.CrossPlatformArrange;
+ IsAccessibilityElement = true;
+ }
+
+ static UIKit.UIAccessibilityTrait? s_switchAccessibilityTraits;
+ UIKit.UIAccessibilityTrait SwitchAccessibilityTraits
+ {
+ get
+ {
+ if (s_switchAccessibilityTraits == null ||
+ s_switchAccessibilityTraits == UIKit.UIAccessibilityTrait.None)
+ {
+ s_switchAccessibilityTraits = new UIKit.UISwitch().AccessibilityTraits;
+ }
+
+ return s_switchAccessibilityTraits ?? UIKit.UIAccessibilityTrait.None;
+ }
+ }
+
+ public override UIAccessibilityTrait AccessibilityTraits
+ {
+ get => _accessibilityTraits |= SwitchAccessibilityTraits;
+ set => _accessibilityTraits = value | SwitchAccessibilityTraits;
+ }
+
+ public override string? AccessibilityValue
+ {
+ get => _radioButton.IsChecked ? "1" : "0";
+ set { }
+ }
+}