[iOS26] Apply view margins in title view

src/Controls/src/Core/Compatibility/Handlers/NavigationPage/iOS/NavigationRenderer.cs

@@ -2295,10 +2295,34 @@ public override CGRect Frame
 								value.Width = (value.X - xSpace) + value.Width;
 								value.X = xSpace;
 							}
+
+							if (_child?.VirtualView is IView view)
+							{
+								var margin = view.Margin;
+
+								// Apply margins AFTER back button spacing calculations
+								// Margins push the view inward to keep it within the nav bar bounds
+								var newWidth = value.Width - (nfloat)(margin.Left + margin.Right);
+								if (newWidth < 0)
+									newWidth = 0;
+
+								value = new RectangleF(
+									value.X + (nfloat)margin.Left,
+									value.Y + (nfloat)margin.Top,
+									newWidth,
+									value.Height
+								);
+							}
 						}
-						;
 
 						value.Height = ToolbarHeight;
+
+						// Reduce height by vertical margins so the view stays within the nav bar
+						if (_child?.VirtualView is IView marginView)
+						{
+							var verticalMargin = (nfloat)(marginView.Margin.Top + marginView.Margin.Bottom);
+							value.Height = (nfloat)Math.Max(0, value.Height - verticalMargin);
+						}
 					}
 
 					base.Frame = value;

src/Controls/tests/TestCases.HostApp/Issues/Issue32200.xaml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="Maui.Controls.Sample.Issues.Issue32200">
+  <NavigationPage.TitleView>
+    <HorizontalStackLayout
+      BackgroundColor="Blue"
+      HorizontalOptions="Fill"
+      VerticalOptions="Fill"
+      Margin="-20,0,0,0">
+      <Label Text="1234567890abcdefghij"/>
+    </HorizontalStackLayout>
+  </NavigationPage.TitleView>
+  <Label Text="Hello, Issue 32200"
+         VerticalOptions="Center"
+         AutomationId="Label"
+         HorizontalOptions="Center"/>
+</ContentPage> 

src/Controls/tests/TestCases.HostApp/Issues/Issue32200.xaml.cs

@@ -0,0 +1,15 @@
+namespace Maui.Controls.Sample.Issues;
+
+[XamlCompilation(XamlCompilationOptions.Compile)]
+[Issue(IssueTracker.Github, 32200, "NavigationPage TitleView iOS 26", PlatformAffected.iOS)]
+public class Issue32200NavigationPage : NavigationPage
+{
+	public Issue32200NavigationPage() : base(new Issue32200()) { }
+}
+public partial class Issue32200 : ContentPage
+{
+	public Issue32200()
+	{
+		InitializeComponent();
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue32200.cs

@@ -0,0 +1,19 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+
+public class Issue32200 : _IssuesUITest
+{
+	public override string Issue => "NavigationPage TitleView iOS 26";
+	public Issue32200(TestDevice device) : base(device) { }
+
+	[Test]
+	[Category(UITestCategories.Navigation)]
+	public void NavigationPageTitleViewShouldRespectMargins()
+	{
+		App.WaitForElement("Label");
+		VerifyScreenshot();
+	}
+}