[iOS] Fixed NavigationStack not updating when OnAppearing is invoked

src/Controls/src/Core/NavigationPage/NavigationPage.Legacy.cs

@@ -43,9 +43,6 @@ async Task<Page> RemoveAsyncInner(
 
 			FireDisappearing(page);
 
-			if (InternalChildren.Last() == page)
-				FireAppearing((Page)InternalChildren[NavigationPageController.StackDepth - 2]);
-
 			var args = new NavigationRequestedEventArgs(page, animated);
 
 			var removed = true;
@@ -62,8 +59,14 @@ async Task<Page> RemoveAsyncInner(
 			if (!removed && !fast)
 				return CurrentPage;
 
+			bool isLastPage = InternalChildren.Last() == page;
 			RemoveFromInnerChildren(page);
 
+			if (isLastPage && NavigationPageController.StackDepth >= 2)
+			{
+				FireAppearing((Page)InternalChildren[NavigationPageController.StackDepth - 2]);
+			}
+
 			CurrentPage = (Page)InternalChildren.Last();
 
 			if (Popped != null)

src/Controls/tests/TestCases.HostApp/Issues/Issue28414.cs

@@ -0,0 +1,111 @@
+namespace Maui.Controls.Sample.Issues;
+
+[Issue(IssueTracker.Github, 28414, "NavigationStack updated when OnAppearing triggered", PlatformAffected.iOS)]
+
+public class Issue28414 : NavigationPage
+{
+	public Issue28414() : base(new Issue28414FirstPage())
+	{
+
+	}
+}
+
+public class Issue28414FirstPage : ContentPage
+{
+	public Issue28414FirstPage()
+	{
+		Title = "FirstPage";
+
+		var navigateButton = new Button
+		{
+			Text = "Go to second page",
+			VerticalOptions = LayoutOptions.Center,
+			HorizontalOptions = LayoutOptions.Center,
+			AutomationId = "FirstPageButton"
+		};
+
+		navigateButton.Clicked += async (sender, args) =>
+		{
+			await Navigation.PushAsync(new Issue28414SecondPage());
+		};
+
+		Content = new VerticalStackLayout
+		{
+			Children = { navigateButton }
+		};
+	}
+}
+
+public class Issue28414SecondPage : ContentPage
+{
+	private Label label;
+
+	public Issue28414SecondPage()
+	{
+		Title = "SecondPage";
+
+		label = new Label
+		{
+			Text = "Initial state",
+			AutomationId = "OnAppearingLabel"
+		};
+
+		var navigateButton = new Button
+		{
+			Text = "Go to third page",
+			VerticalOptions = LayoutOptions.Center,
+			HorizontalOptions = LayoutOptions.Center,
+			AutomationId = "SecondPageButton"
+		};
+
+		navigateButton.Clicked += async (sender, args) =>
+		{
+			label.Text = string.Empty;
+			await Navigation.PushAsync(new Issue28414ThirdPage());
+		};
+
+		Content = new VerticalStackLayout
+		{
+			Children = { label, navigateButton }
+		};
+	}
+
+	protected override void OnAppearing()
+	{
+		base.OnAppearing();
+		if (Navigation.NavigationStack.Count == 2)
+		{
+			label.Text = $"Stack has {Navigation.NavigationStack.Count} pages";
+		}
+		else
+		{
+			label.Text = "Page not popped yet";
+		}
+	}
+}
+
+public class Issue28414ThirdPage : ContentPage
+{
+	public Issue28414ThirdPage()
+	{
+		Title = "ThirdPage";
+
+		var button = new Button
+		{
+			Text = "Go Back",
+			HorizontalOptions = LayoutOptions.Center,
+			VerticalOptions = LayoutOptions.Center,
+			AutomationId = "ThirdPageButton"
+		};
+
+		button.Clicked += async (sender, args) =>
+		{
+			await Navigation.PopAsync();
+		};
+
+		Content = new VerticalStackLayout
+		{
+			Children = { button }
+		};
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue28414.cs

@@ -0,0 +1,27 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+
+public class Issue28414 : _IssuesUITest
+{
+	public Issue28414(TestDevice testDevice) : base(testDevice)
+	{
+	}
+	public override string Issue => "NavigationStack updated when OnAppearing triggered";
+
+	[Test]
+	[Category(UITestCategories.Navigation)]
+	public void NavigationStackUpdatesOnPop()
+	{
+		App.WaitForElement("FirstPageButton");
+		App.Tap("FirstPageButton");
+		App.WaitForElement("SecondPageButton");
+		App.Tap("SecondPageButton");
+		App.WaitForElement("ThirdPageButton");
+		App.Tap("ThirdPageButton");
+		var label = App.WaitForElement("OnAppearingLabel");
+		Assert.That(label.GetText(), Is.EqualTo("Stack has 2 pages"));
+	}
+}