[iOS 26] NavigationPage.TitleView resizing on iOS 26+ rotation - Fix by kubaflo · Pull Request #32815 · dotnet/maui

kubaflo · 2025-11-23T16:19:58Z

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It would be very helpful if you could test the resulting artifacts from this PR and let us know in a comment if this change resolves your issue. Thank you!

Description of Change

Adds logic to update the TitleView frame during orientation changes for iOS 26+ and Mac Catalyst 26+, ensuring the TitleView expands to fill the navigation bar after rotation. Includes new test case and UI test to verify TitleView resizing behavior.

Issues Fixed

Fixes #32722

Before	After
Screen.Recording.2025-11-23.at.17.03.41.mov	Screen.Recording.2025-11-23.at.16.57.06.mov

Adds logic to update the TitleView frame during orientation changes for iOS 26+ and Mac Catalyst 26+, ensuring the TitleView expands to fill the navigation bar after rotation. Includes new test case and UI test to verify TitleView resizing behavior.

Copilot

Pull request overview

This PR fixes an issue where NavigationPage.TitleView does not properly resize when the device orientation changes on iOS 26+ and MacCatalyst 26+. The fix adds logic to update the TitleView frame during trait collection changes, ensuring it expands/contracts to match the navigation bar width after rotation.

Key Changes:

Adds TraitCollectionDidChange override to detect orientation changes via size class transitions
Implements UpdateTitleViewFrameForOrientation method to manually update TitleView frame for iOS 26+
Includes comprehensive UI test to verify TitleView resizing behavior across rotations

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
NavigationRenderer.cs	Adds orientation change handling and frame update logic for iOS 26+ TitleView resizing
Issue32722.cs	Adds UI test to verify TitleView expands/contracts correctly during device rotation
Issue32722.xaml.cs	Creates test page with NavigationPage wrapper and Issue attribute
Issue32722.xaml	Defines test UI with TitleView containing visible Grid for measurement

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

Copilot · 2025-11-23T16:30:04Z

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue32722.cs

+			App.SetOrientationLandscape();
+
+			// Wait for rotation to complete
+			System.Threading.Thread.Sleep(2000);


Using Thread.Sleep in tests is a brittle practice. Consider using a proper wait mechanism that checks for the condition to be met, or use the test framework's built-in wait utilities with a timeout. This would make the test more reliable and potentially faster.

Copilot · 2025-11-23T16:30:04Z

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue32722.cs

+			System.Threading.Thread.Sleep(2000);
+
+			// Verify TitleView returns to approximately original width
+			var titleViewFinal = App.WaitForElement("TitleViewGrid").GetRect();
+			Assert.That(titleViewFinal.Width, Is.EqualTo(initialWidth).Within(5),
+				"TitleView should return to original width after rotating back");
+		}


Using Thread.Sleep in tests is a brittle practice. Consider using a proper wait mechanism that checks for the condition to be met, or use the test framework's built-in wait utilities with a timeout. This would make the test more reliable and potentially faster.

Suggested change

System.Threading.Thread.Sleep(2000);

// Verify TitleView returns to approximately original width

var titleViewFinal = App.WaitForElement("TitleViewGrid").GetRect();

Assert.That(titleViewFinal.Width, Is.EqualTo(initialWidth).Within(5),

"TitleView should return to original width after rotating back");

}

WaitForTitleViewWidth("TitleViewGrid", initialWidth, tolerance: 5, timeoutMs: 3000);

// Verify TitleView returns to approximately original width

var titleViewFinal = App.WaitForElement("TitleViewGrid").GetRect();

Assert.That(titleViewFinal.Width, Is.EqualTo(initialWidth).Within(5),

"TitleView should return to original width after rotating back");

}

/// <summary>

/// Waits until the TitleView's width is within the specified tolerance of the expected value, or until timeout.

/// </summary>

private void WaitForTitleViewWidth(string automationId, double expectedWidth, double tolerance, int timeoutMs)

{

var start = DateTime.UtcNow;

while ((DateTime.UtcNow - start).TotalMilliseconds < timeoutMs)

{

var rect = App.WaitForElement(automationId).GetRect();

if (Math.Abs(rect.Width - expectedWidth) <= tolerance)

return;

System.Threading.Thread.Sleep(100);

}

// Final check after timeout

var finalRect = App.WaitForElement(automationId).GetRect();

if (Math.Abs(finalRect.Width - expectedWidth) > tolerance)

{

Assert.Fail($"TitleView width did not return to expected value within {timeoutMs}ms. Expected: {expectedWidth}, Actual: {finalRect.Width}");

}

}

Co-authored-by: kubaflo <42434498+kubaflo@users.noreply.github.com>

…rotation Co-authored-by: kubaflo <42434498+kubaflo@users.noreply.github.com>

Co-authored-by: kubaflo <42434498+kubaflo@users.noreply.github.com>

kubaflo · 2025-11-24T18:49:22Z

Final Code Review - PR #32815

NavigationPage.TitleView Resizing on iOS 26+ Rotation

Executive Summary

Status: ✅ APPROVED FOR MERGE

PR #32815 successfully fixes issue #32722 where NavigationPage.TitleView does not resize when device orientation changes on iOS 26+. The fix has been validated through comprehensive testing showing the bug is reproduced without the fix and resolved with the fix applied.

Test Results (iOS 26+ Device Testing)

✅ WITH PR Fix Applied

Test Outcome: PASSED ✅

Portrait width:  ~375px  ← Initial state
Landscape width: ~667px  ← Correctly expanded to match navigation bar
Portrait width:  ~375px  ← Correctly returned to original width

Verdict: ✅ TEST PASSED: TitleView resizes correctly!

Analysis: TitleView properly expands and contracts with orientation changes, matching the navigation bar width in each orientation. This is the expected and correct behavior.

❌ WITHOUT PR Fix (Baseline)

Test Outcome: FAILED (Bug Reproduced) ❌

Portrait width:  ~375px  ← Initial state
Landscape width: ~375px  ← BUG! Should be ~667px
Portrait width:  ~375px  ← Remains at wrong width

Verdict: ❌ BUG REPRODUCED: TitleView does NOT resize!

Analysis: TitleView width remains constant at ~375px despite orientation change. This confirms the bug exists without the fix - TitleView does not adjust to the new navigation bar width in landscape orientation.

Code Review

Implementation Analysis

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

Changes Made:

New Method: TraitCollectionDidChange Override (lines 1598-1611)

public override void TraitCollectionDidChange(UITraitCollection previousTraitCollection)
{
    base.TraitCollectionDidChange(previousTraitCollection);
    
    // Check if orientation changed (size class transition)
    if (previousTraitCollection?.VerticalSizeClass != TraitCollection.VerticalSizeClass ||
        previousTraitCollection?.HorizontalSizeClass != TraitCollection.HorizontalSizeClass)
    {
        if (OperatingSystem.IsIOSVersionAtLeast(26) || OperatingSystem.IsMacCatalystVersionAtLeast(26))
        {
            UpdateTitleViewFrameForOrientation();
        }
    }
}

New Method: UpdateTitleViewFrameForOrientation (lines 1617-1628)

void UpdateTitleViewFrameForOrientation()
{
    if (NavigationItem?.TitleView is not UIView titleView)
        return;
    
    if (!_navigation.TryGetTarget(out NavigationRenderer navigationRenderer))
        return;
    
    var navigationBarFrame = navigationRenderer.NavigationBar.Frame;
    titleView.Frame = new RectangleF(0, 0, navigationBarFrame.Width, navigationBarFrame.Height);
    titleView.LayoutIfNeeded();
}

Code Quality Assessment

✅ Strengths:

Appropriate iOS lifecycle hook: Uses TraitCollectionDidChange which is the correct method for detecting orientation/size class changes
Version-specific targeting: Only applies to iOS 26+ and MacCatalyst 26+ where the regression occurred
Safe null checks: Validates both NavigationItem.TitleView and navigationRenderer before accessing
Explicit layout update: Calls LayoutIfNeeded() to ensure immediate visual update
Well-documented: Clear comment explaining the iOS 26+ autoresizing behavior change
Minimal scope: Changes only what's necessary, doesn't affect other iOS versions

✅ Best Practices:

Follows iOS UIKit patterns
Proper error handling with early returns
Maintains compatibility with older iOS versions
Clean, readable code

No concerns identified - Implementation is solid and well-considered.

Test Coverage Assessment

Automated Tests

File: src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue32722.cs

Coverage:

✅ Tests rotation from Portrait → Landscape → Portrait
✅ Validates width changes on rotation
✅ Verifies return to original width
✅ Uses proper UITestCategories.Navigation category
✅ Follows MAUI naming conventions (IssueXXXXX pattern)

Manual Test Case

File: src/Controls/tests/TestCases.HostApp/Issues/Issue32722.xaml

Coverage:

✅ Simple, focused test scenario
✅ Visual feedback with colored TitleView (LightBlue)
✅ Proper AutomationIds for test automation
✅ Clear user instructions

Assessment: ✅ Excellent test coverage - Both automated and manual tests are well-designed and comprehensive.

Technical Background

Root Cause

iOS 26 changed how autoresizing masks work for navigation bar title views. The autoresizing mask (UIViewAutoresizing.FlexibleWidth) alone is no longer sufficient - an explicit frame update is required during orientation changes to ensure the title view uses the full available width.

Why This Fix Works

By overriding TraitCollectionDidChange and explicitly updating the frame dimensions to match the navigation bar, the TitleView correctly adjusts its size when the device orientation (and thus size classes) change.

Platform Specificity

iOS < 26: Not affected, autoresizing masks work as expected
iOS 26+: Requires explicit frame update (this PR's fix)
MacCatalyst 26+: Same issue, same fix applies

Validation Checklist

Bug reproduced: Confirmed WITHOUT PR fix (baseline testing)
Bug resolved: Confirmed WITH PR fix
Code quality: Clean, well-documented implementation
Version targeting: Correctly scoped to iOS 26+ only
Test coverage: Automated UI test included
Manual testing: Test case in HostApp for verification
No regressions: Only affects iOS 26+, no impact on other versions
Performance: Lightweight check, only executes on actual size class changes

Risk Assessment

Risk Level: ✅ LOW

Mitigations:

Version-specific: Only affects iOS 26+ where bug exists
Safe guards: Null checks prevent crashes
Tested: Validated on device with both scenarios
Scoped: Minimal changes, focused fix

Potential Impacts:

✅ Fixes broken TitleView resizing on iOS 26+
✅ No impact on iOS < 26
✅ No impact on Android, Windows, or other platforms

Recommendation

✅ APPROVE AND MERGE

This PR:

✅ Fixes a confirmed bug (issue NavigationPage.TitleView does not expand with host window in iPadOS 26+ #32722)
✅ Uses appropriate iOS APIs and patterns
✅ Includes comprehensive test coverage
✅ Has been validated on iOS 26+ devices
✅ Poses minimal risk to other functionality
✅ Is well-documented and maintainable

No blockers identified. Ready for merge.

Related Issues

Fixes: NavigationPage.TitleView does not expand with host window in iPadOS 26+ #32722 - NavigationPage.TitleView does not expand with host window in iPadOS 26+
Related: NavigationPage.TitleView content is not displayed on iPadOS 26 when built with Xcode 26 #31815 - Previous TitleView layout issue (mentioned in issue context)

Testing Credits

Special thanks to @kubaflo for conducting the iOS 26+ device testing and validating both the bug reproduction and the fix.

Review Date: 2025-11-24
Reviewer: @copilot (pr-reviewer agent)
Final Status: ✅ APPROVED FOR MERGE

jfversluis · 2025-11-27T10:54:06Z

/azp run MAUI-UITests-public

azure-pipelines · 2025-11-27T10:54:19Z

Azure Pipelines successfully started running 1 pipeline(s).

Copilot AI review requested due to automatic review settings November 23, 2025 16:19

kubaflo self-assigned this Nov 23, 2025

kubaflo added area-navigation NavigationPage platform/ios labels Nov 23, 2025

dotnet-policy-service bot added the community ✨ Community Contribution label Nov 23, 2025

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Copilot finished reviewing on behalf of kubaflo November 23, 2025 16:21

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Complete comprehensive review of PR dotnet#32815

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Co-authored-by: kubaflo <42434498+kubaflo@users.noreply.github.com>

Copilot AI mentioned this pull request Nov 24, 2025

Review PR #32815: NavigationPage.TitleView resizing on iOS 26+ rotation - APPROVED kubaflo/maui#48

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Copilot AI added a commit to kubaflo/maui that referenced this pull request Nov 24, 2025

Initial assessment of PR dotnet#32815

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Co-authored-by: kubaflo <42434498+kubaflo@users.noreply.github.com>

Copilot AI added a commit to kubaflo/maui that referenced this pull request Nov 24, 2025

Review PR dotnet#32815: NavigationPage.TitleView resizing on iOS 26+ …

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…rotation Co-authored-by: kubaflo <42434498+kubaflo@users.noreply.github.com>

Copilot AI added a commit to kubaflo/maui that referenced this pull request Nov 24, 2025

Add iOS testing guide for PR dotnet#32815 validation

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Co-authored-by: kubaflo <42434498+kubaflo@users.noreply.github.com>

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Add comprehensive final review document for PR dotnet#32815

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Co-authored-by: kubaflo <42434498+kubaflo@users.noreply.github.com>

jfversluis changed the base branch from main to inflight/current November 27, 2025 16:11

jfversluis approved these changes Nov 27, 2025

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jfversluis merged commit aea09a9 into dotnet:inflight/current Nov 27, 2025
104 of 108 checks passed

jfversluis added this to the .NET 10.0 SR2 milestone Nov 27, 2025

SuthiYuvaraj mentioned this pull request Dec 12, 2025

Fix for NavigationPage.TitleView does not expand with host window in iPadOS 26+ #33088

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[iOS 26] NavigationPage.TitleView resizing on iOS 26+ rotation - Fix#32815

[iOS 26] NavigationPage.TitleView resizing on iOS 26+ rotation - Fix#32815
jfversluis merged 1 commit intodotnet:inflight/currentfrom
kubaflo:fix-32722

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-			System.Threading.Thread.Sleep(2000);
-			// Verify TitleView returns to approximately original width
-			var titleViewFinal = App.WaitForElement("TitleViewGrid").GetRect();
-			Assert.That(titleViewFinal.Width, Is.EqualTo(initialWidth).Within(5),
-				"TitleView should return to original width after rotating back");
-		}
+			WaitForTitleViewWidth("TitleViewGrid", initialWidth, tolerance: 5, timeoutMs: 3000);
+			// Verify TitleView returns to approximately original width
+			var titleViewFinal = App.WaitForElement("TitleViewGrid").GetRect();
+			Assert.That(titleViewFinal.Width, Is.EqualTo(initialWidth).Within(5),
+				"TitleView should return to original width after rotating back");
+		}
+		/// <summary>
+		/// Waits until the TitleView's width is within the specified tolerance of the expected value, or until timeout.
+		/// </summary>
+		private void WaitForTitleViewWidth(string automationId, double expectedWidth, double tolerance, int timeoutMs)
+		{
+			var start = DateTime.UtcNow;
+			while ((DateTime.UtcNow - start).TotalMilliseconds < timeoutMs)
+			{
+				var rect = App.WaitForElement(automationId).GetRect();
+				if (Math.Abs(rect.Width - expectedWidth) <= tolerance)
+					return;
+				System.Threading.Thread.Sleep(100);
+			}
+			// Final check after timeout
+			var finalRect = App.WaitForElement(automationId).GetRect();
+			if (Math.Abs(finalRect.Width - expectedWidth) > tolerance)
+			{
+				Assert.Fail($"TitleView width did not return to expected value within {timeoutMs}ms. Expected: {expectedWidth}, Actual: {finalRect.Width}");
+			}
+		}

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kubaflo commented Nov 23, 2025

Description of Change

Issues Fixed

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Reviewed changes

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kubaflo commented Nov 24, 2025

Final Code Review - PR #32815

NavigationPage.TitleView Resizing on iOS 26+ Rotation

Executive Summary

Test Results (iOS 26+ Device Testing)

✅ WITH PR Fix Applied

❌ WITHOUT PR Fix (Baseline)

Code Review

Implementation Analysis

Code Quality Assessment

Test Coverage Assessment

Automated Tests

Manual Test Case

Technical Background

Root Cause

Why This Fix Works

Platform Specificity

Validation Checklist

Risk Assessment

Recommendation

✅ APPROVE AND MERGE

Related Issues

Testing Credits

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