Fixed the Picker didn't dismiss it when tapping outside on iOS and MacCatalyst platform.

src/Controls/tests/TestCases.HostApp/Issues/Issue19168.cs

@@ -0,0 +1,45 @@
+namespace Maui.Controls.Sample.Issues;
+
+[Issue(IssueTracker.Github, 19168, "iOS Picker dismiss does not work when clicking outside of the Picker", PlatformAffected.iOS | PlatformAffected.macOS)]
+public class Issue19168 : ContentPage
+{
+	Picker picker;
+	public Issue19168()
+	{
+		picker = new Picker
+		{
+			ItemsSource = new List<string>
+			{
+				"Baboon",
+				"Capuchin Monkey",
+				"Blue Monkey",
+				"Squirrel Monkey",
+				"Golden Lion Tamarin",
+				"Howler Monkey",
+				"Japanese Macaque"
+			},
+			AutomationId = "Picker"
+		};
+
+		var counterBtn = new Button
+		{
+			Text = "Click me",
+			AutomationId = "Button",
+			VerticalOptions = LayoutOptions.End,
+			HorizontalOptions = LayoutOptions.Fill
+		};
+		Content = new ScrollView
+		{
+			Content = new VerticalStackLayout
+			{
+				Padding = new Thickness(30, 0),
+				Spacing = 25,
+				Children =
+				{
+					picker,
+					counterBtn,
+				}
+			}
+		};
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue19168.cs

@@ -0,0 +1,32 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+
+public class Issue19168 : _IssuesUITest
+{
+	public Issue19168(TestDevice testDevice) : base(testDevice)
+	{
+	}
+	public override string Issue => "iOS Picker dismiss does not work when clicking outside of the Picker";
+
+	[Test]
+	[Category(UITestCategories.Picker)]
+	public void PickerShouldDismissWhenClickOnOutside()
+	{
+		App.WaitForElement("Picker");
+		App.Tap("Picker");
+#if MACCATALYST
+		App.TapCoordinates(600, 200);
+		App.WaitForElement("Button");
+#elif ANDROID
+		App.TapCoordinates(0, 100);
+#elif WINDOWS
+		App.TapCoordinates(60, 600);
+#elif IOS
+		App.Tap("Button");
+#endif
+		VerifyScreenshot();
+	}
+}

src/Core/src/Handlers/Picker/PickerHandler.iOS.cs

@@ -10,6 +10,7 @@ public partial class PickerHandler : ViewHandler<IPicker, MauiPicker>
 	{
 		readonly MauiPickerProxy _proxy = new();
 		UIPickerView? _pickerView;
+		UITapGestureRecognizer? _tapGestureRecognizer;
 
 #if MACCATALYST
 		UIAlertController? _pickerController;
@@ -136,6 +137,7 @@ protected override void ConnectHandler(MauiPicker platformView)
 		protected override void DisconnectHandler(MauiPicker platformView)
 		{
 			_proxy.Disconnect(platformView);
+			RemoveTouchDismissGesture();
 
 #if MACCATALYST
 			if (_pickerController != null)
@@ -269,6 +271,60 @@ void FinishSelectItem(UIPickerView? pickerView, MauiPicker textField)
 			textField.ResignFirstResponder();
 		}
 
+		void SetupTouchDismissGesture()
+		{
+			// Don't setup if window isn't available yet
+			if (PlatformView?.Window is null)
+			{
+    			return;
+			}
+
+			// Don't setup if already configured
+			if (_tapGestureRecognizer is not null)
+			{
+    			return;
+			}
+			var weakHandler = new WeakReference<PickerHandler>(this);
+			_tapGestureRecognizer = new UITapGestureRecognizer(() =>
+			{
+				if (weakHandler.TryGetTarget(out var handler))
+				{
+					handler.DismissPicker();
+				}
+			});
+			_tapGestureRecognizer.CancelsTouchesInView = false;
+			PlatformView.Window.AddGestureRecognizer(_tapGestureRecognizer);
+		}
+
+		void DismissPicker()
+		{
+#if MACCATALYST
+			// On MacCatalyst, dismiss the UIAlertController and clean up the tap gesture directly,
+			// since ResignFirstResponder is not called here and OnEnded will not fire.
+			if (_pickerController is not null)
+			{
+				_pickerController.DismissViewController(true, null);
+				if (VirtualView is IPicker virtualView)
+					virtualView.IsFocused = virtualView.IsOpen = false;
+			}
+			RemoveTouchDismissGesture();
+#else
+			// On iOS, dismiss by ending editing
+			PlatformView?.EndEditing(true);
+#endif
+		}
+
+
+		void RemoveTouchDismissGesture()
+		{
+			if (_tapGestureRecognizer is not null)
+			{
+				_tapGestureRecognizer.View?.RemoveGestureRecognizer(_tapGestureRecognizer);
+				_tapGestureRecognizer.Dispose();
+				_tapGestureRecognizer = null;
+			}
+		}
+
 		class MauiPickerProxy
 		{
 			WeakReference<PickerHandler>? _handler;
@@ -290,6 +346,7 @@ public void Connect(PickerHandler handler, IPicker virtualView, MauiPicker platf
 
 			public void Disconnect(MauiPicker platformView)
 			{
+				Handler?.RemoveTouchDismissGesture();
 				platformView.EditingDidBegin -= OnStarted;
 				platformView.EditingDidEnd -= OnEnded;
 				platformView.EditingChanged -= OnEditing;
@@ -322,10 +379,12 @@ void OnStarted(object? sender, EventArgs eventArgs)
 				int selectedIndex = handler.VirtualView?.SelectedIndex ?? 0;
 				handler.DisplayAlert(handler.PlatformView, selectedIndex);
 #endif
+				Handler?.SetupTouchDismissGesture();
 			}
 
 			void OnEnded(object? sender, EventArgs eventArgs)
 			{
+				Handler?.RemoveTouchDismissGesture();
 				if (Handler is not PickerHandler handler || handler._pickerView is not UIPickerView pickerView)
 					return;