[iOS] Added support for large titles in Shell

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

@@ -5,6 +5,7 @@
 using System.ComponentModel;
 using System.Linq;
 using Foundation;
+using Microsoft.Maui.Controls.PlatformConfiguration.iOSSpecific;
 using Microsoft.Maui.Graphics;
 using ObjCRuntime;
 using UIKit;
@@ -399,6 +400,7 @@ void OnDisplayedPageChanged(Page page)
 			{
 				_displayedPage.PropertyChanged += OnDisplayedPagePropertyChanged;
 				UpdateTabBarHidden();
+				UpdateLargeTitles();
 			}
 		}
 
@@ -408,6 +410,31 @@ void OnDisplayedPagePropertyChanged(object sender, PropertyChangedEventArgs e)
 				UpdateTabBarHidden();
 		}
 
+
+		void UpdateLargeTitles()
+		{
+			var page = _displayedPage;
+			if (page is null || !OperatingSystem.IsIOSVersionAtLeast(11))
+				return;
+
+			var largeTitleDisplayMode = page.OnThisPlatform().LargeTitleDisplay();
+
+			if (SelectedViewController is UINavigationController navigationController)
+			{
+				navigationController.NavigationBar.PrefersLargeTitles = largeTitleDisplayMode != LargeTitleDisplayMode.Never;
+				var top = navigationController.TopViewController;
+				if (top is not null)
+				{
+					top.NavigationItem.LargeTitleDisplayMode = largeTitleDisplayMode switch
+					{
+						LargeTitleDisplayMode.Always => UINavigationItemLargeTitleDisplayMode.Always,
+						LargeTitleDisplayMode.Automatic => UINavigationItemLargeTitleDisplayMode.Automatic,
+						_ => UINavigationItemLargeTitleDisplayMode.Never
+					};
+				}
+			}
+		}
+
 		void RemoveRenderer(IShellSectionRenderer renderer)
 		{
 			if (_sectionRenderers.Remove(renderer.ViewController))
@@ -441,6 +468,7 @@ IShellSectionRenderer RendererForViewController(UIViewController viewController)
 		public override void ViewWillLayoutSubviews()
 		{
 			UpdateTabBarHidden();
+			UpdateLargeTitles();
 			base.ViewWillLayoutSubviews();
 		}
 

src/Controls/tests/TestCases.HostApp/Issues/Issue12156.xaml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<Shell xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+       xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+       xmlns:ios="clr-namespace:Microsoft.Maui.Controls.PlatformConfiguration.iOSSpecific;assembly=Microsoft.Maui.Controls"
+       ios:Page.LargeTitleDisplay="Always"
+       x:Class="Maui.Controls.Sample.Issues.Issue12156">
+
+    <ShellContent Title="Home">
+        <ContentPage>
+            <Label
+                Text="Issue 12156"
+                AutomationId="Label"
+                VerticalOptions="Center"
+                HorizontalOptions="Center"/>
+        </ContentPage>
+    </ShellContent>
+
+</Shell>

src/Controls/tests/TestCases.HostApp/Issues/Issue12156.xaml.cs

@@ -0,0 +1,10 @@
+namespace Maui.Controls.Sample.Issues;
+
+[Issue(IssueTracker.Github, 12156, "iOS Page.LargeTitleDisplay does not work on iOS", PlatformAffected.iOS)]
+public partial class Issue12156 : Shell
+{
+	public Issue12156()
+	{
+		InitializeComponent();
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue12156.cs

@@ -0,0 +1,24 @@
+#if TEST_FAILS_ON_ANDROID && TEST_FAILS_ON_ANDROID && TEST_FAILS_ON_WINDOWS
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+
+public class Issue12156 : _IssuesUITest
+{
+	public Issue12156(TestDevice testDevice) : base(testDevice)
+	{
+	}
+
+	public override string Issue => "iOS Page.LargeTitleDisplay does not work on iOS";
+
+	[Test]
+	[Category(UITestCategories.TitleView)]
+	public void LargeTitleDisplayWorks()
+	{
+		App.WaitForElement("Label");
+		VerifyScreenshot();
+	}
+}
+#endif