[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 { }
+	}
+}