[iOS] BackButtonBehavior IsEnabled - fix

src/Controls/src/Core/Compatibility/Handlers/Shell/iOS/ShellSectionRenderer.cs

@@ -130,9 +130,15 @@ internal bool SendPop()
 				if (tracker.Value.ViewController == TopViewController)
 				{
 					var behavior = Shell.GetEffectiveBackButtonBehavior(tracker.Value.Page);
+					var enabled = behavior.GetPropertyIfSet(BackButtonBehavior.IsEnabledProperty, true);
 					var command = behavior.GetPropertyIfSet<ICommand>(BackButtonBehavior.CommandProperty, null);
 					var commandParameter = behavior.GetPropertyIfSet<object>(BackButtonBehavior.CommandParameterProperty, null);
 
+					if (!enabled)
+					{
+						return false;
+					}
+
 					if (command != null)
 					{
 						if (command.CanExecute(commandParameter))

src/Controls/src/Core/Shell/BackButtonBehavior.cs

@@ -89,7 +89,7 @@ public string TextOverride
 			set { SetValue(TextOverrideProperty, value); }
 		}
 
-		bool IsEnabledCore { set => SetValue(IsEnabledProperty, value); }
+		bool IsEnabledCore { set => SetValue(IsEnabledProperty, value && IsEnabled); }
 
 		static void OnCommandChanged(BindableObject bindable, object oldValue, object newValue)
 		{

src/Controls/tests/TestCases.HostApp/Issues/Issue28722.cs

@@ -0,0 +1,45 @@
+namespace Maui.Controls.Sample.Issues;
+[Issue(IssueTracker.Github, 28722, "IsEnabled does not work in BackButtonBehavior", PlatformAffected.iOS)]
+public class Issue28722 : Shell
+{
+	public Issue28722()
+	{
+		Routing.RegisterRoute(nameof(Issue28722Page1), typeof(Issue28722Page1));
+		Items.Add(new ContentPage());
+	}
+
+	protected override void OnAppearing()
+	{
+		base.OnAppearing();
+		Current.GoToAsync(nameof(Issue28722Page1));
+
+	}
+}
+
+public class Issue28722Page1 : ContentPage
+{
+	public Issue28722Page1()
+	{
+		var label = new Label()
+		{
+			Text = "Welcome to Page 1",
+			AutomationId = "HelloLabel",
+			IsVisible = false
+		};
+
+		var backButtonBehavior = new BackButtonBehavior()
+		{
+			IsEnabled = true,
+			TextOverride = "Click",
+		};
+
+		backButtonBehavior.Command = new Command(() =>
+		{
+			label.IsVisible = !label.IsVisible;
+			backButtonBehavior.IsEnabled = false;
+		});
+
+		Shell.SetBackButtonBehavior(this, backButtonBehavior);
+		Content = label;
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue28722.cs

@@ -0,0 +1,26 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues
+{
+	public class Issue28722 : _IssuesUITest
+	{
+		public Issue28722(TestDevice testDevice) : base(testDevice)
+		{
+		}
+
+		public override string Issue => "IsEnabled does not work in BackButtonBehavior";
+
+		[Test]
+		[Category(UITestCategories.Shell)]
+		public void IsEnabledShouldWorkInBackButtonBehavior()
+		{
+			App.WaitForElement("Click");
+			App.Click("Click");
+			App.WaitForElement("HelloLabel");
+			App.Click("Click");
+			App.WaitForElement("HelloLabel");
+		}
+	}
+}