Introduce SetSemanticFocus API via SemanticExtensions

src/Controls/samples/Controls.Sample/Pages/Core/SemanticsPage.xaml

@@ -184,7 +184,20 @@
                     Text="Button in StackLayout with semantic description"
                     FontSize="14"/>
             </VerticalStackLayout>
-
+			<Label
+                Text="Explore SemanticExtensions below"
+                TextColor="RoyalBlue"
+                FontAttributes="Bold"
+                FontSize="16"
+                Margin="0,10"/>
+            <Button
+                Text="Click to set semantic focus to label below"
+                FontSize="14"
+                Clicked="SetSemanticFocusButton_Clicked"/>
+            <Label
+                x:Name="semanticFocusLabel"
+                Text="Label receiving semantic focus"
+                FontSize="14"/>
             <Label
                 Text="Explore AutomationProperties on controls within layouts below"
                 TextColor="RoyalBlue"

src/Controls/samples/Controls.Sample/Pages/Core/SemanticsPage.xaml.cs

@@ -1,5 +1,4 @@
-using System;
-using Maui.Controls.Sample.Pages.Base;
+using Maui.Controls.Sample.Pages.Base;
 using Microsoft.Maui;
 using Microsoft.Maui.Controls.Xaml;
 
@@ -27,5 +26,10 @@ private async void PushButton_Clicked(object sender, System.EventArgs e)
 		{
 			await Navigation.PushAsync(new SemanticsPage());
 		}
+
+		private void SetSemanticFocusButton_Clicked(object sender, System.EventArgs e)
+		{
+			semanticFocusLabel.SetSemanticFocus();
+		}
 	}
 }

src/Core/src/Platform/Android/SemanticExtensions.cs

@@ -0,0 +1,18 @@
+using System;
+using Android.Text;
+using Android.Views;
+using Android.Views.Accessibility;
+
+namespace Microsoft.Maui
+{
+	public static partial class SemanticExtensions
+	{
+		public static void SetSemanticFocus(this IFrameworkElement element)
+		{
+			if (element?.Handler?.NativeView is not View view)
+				throw new NullReferenceException("Can't access view from a null handler");
+
+			view.SendAccessibilityEvent(EventTypes.ViewFocused);
+		}
+	}
+}

src/Core/src/Platform/Standard/SemanticExtensions.cs

@@ -0,0 +1,11 @@
+namespace Microsoft.Maui
+{
+	public static partial class SemanticExtensions
+	{
+		/// <summary>
+		/// Force semantic screen reader focus to specified element
+		/// </summary>
+		/// <param name="element"></param>
+		public static void SetSemanticFocus(this IFrameworkElement element) { }
+	}
+}

src/Core/src/Platform/Windows/SemanticExtensions.cs

@@ -0,0 +1,7 @@
+namespace Microsoft.Maui
+{
+	public static partial class SemanticExtensions
+	{
+		public static void SetSemanticFocus(this IFrameworkElement element) { }
+	}
+}

src/Core/src/Platform/iOS/MauiCheckBox.cs

@@ -13,7 +13,6 @@ public class MauiCheckBox : UIButton
 
 		static UIImage? Checked;
 		static UIImage? Unchecked;
-		static UIAccessibilityTrait? s_switchAccessibilityTraits;
 		UIAccessibilityTrait _accessibilityTraits;
 
 		Color? _tintColor;
@@ -24,17 +23,6 @@ public class MauiCheckBox : UIButton
 
 		public EventHandler? CheckedChanged;
 
-		internal float MinimumViewSize
-		{
-			get { return _minimumViewSize; }
-			set
-			{
-				_minimumViewSize = value;
-				var xOffset = (value - DefaultSize + LineWidth) / 4;
-				ContentEdgeInsets = new UIEdgeInsets(0, xOffset, 0, 0);
-			}
-		}
-
 		public MauiCheckBox()
 		{
 			ContentMode = UIViewContentMode.Center;
@@ -43,10 +31,7 @@ public MauiCheckBox()
 			VerticalAlignment = UIControlContentVerticalAlignment.Center;
 			AdjustsImageWhenDisabled = false;
 			AdjustsImageWhenHighlighted = false;
-
 			TouchUpInside += OnTouchUpInside;
-			s_switchAccessibilityTraits ??= new UISwitch().AccessibilityTraits;
-			_accessibilityTraits = s_switchAccessibilityTraits.Value;
 		}
 
 		void OnTouchUpInside(object? sender, EventArgs e)
@@ -55,6 +40,17 @@ void OnTouchUpInside(object? sender, EventArgs e)
 			CheckedChanged?.Invoke(this, EventArgs.Empty);
 		}
 
+		internal float MinimumViewSize
+		{
+			get { return _minimumViewSize; }
+			set
+			{
+				_minimumViewSize = value;
+				var xOffset = (value - DefaultSize + LineWidth) / 4;
+				ContentEdgeInsets = new UIEdgeInsets(0, xOffset, 0, 0);
+			}
+		}
+
 		public bool IsChecked
 		{
 			get => _isChecked;
@@ -266,11 +262,30 @@ void UpdateDisplay()
 			SetNeedsDisplay();
 		}
 
+		static UIKit.UIAccessibilityTrait? s_switchAccessibilityTraits;
+		UIKit.UIAccessibilityTrait SwitchAccessibilityTraits
+		{
+			get
+			{
+				// Accessibility Traits are none if VO is off
+				// So we return None until we detect that it's been turned on
+				if (base.AccessibilityTraits == UIAccessibilityTrait.None)
+					return UIAccessibilityTrait.None;
+
+				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;
-			set => _accessibilityTraits = value;
+			get => _accessibilityTraits |= SwitchAccessibilityTraits;
+			set => _accessibilityTraits = value | SwitchAccessibilityTraits;
 		}
 
 		public override string? AccessibilityValue

src/Core/src/Platform/iOS/SemanticExtensions.cs

@@ -0,0 +1,20 @@
+using Foundation;
+using UIKit;
+using System;
+
+namespace Microsoft.Maui
+{
+	public static partial class SemanticExtensions
+	{
+		public static void SetSemanticFocus(this IFrameworkElement element)
+		{
+			if (element?.Handler?.NativeView == null)
+				throw new NullReferenceException("Can't access view from a null handler");
+
+			if (element.Handler.NativeView is not NSObject nativeView)
+				return;
+
+			UIAccessibility.PostNotification(UIAccessibilityPostNotification.LayoutChanged, nativeView);
+		}
+	}
+}