Fix TabbedPage crash on iPadOS 26+ with narrow viewports #32739
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Co-authored-by: PureWeen <[email protected]>
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[WIP] Backport pull request #32662 from dotnet/maui
Fix TabbedPage crash on iPadOS 26+ with narrow viewports
Nov 19, 2025
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Nov 19, 2025
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Pull Request Overview
This PR fixes a NullReferenceException crash in TabbedPage on iPadOS 26.1+ when running in narrow viewports (< 667pt width). The crash occurs because iOS 26.1 introduced early ViewDidLayoutSubviews() calls during UITabBarController base constructor execution, before the _viewHandlerWrapper field is fully initialized.
Key Changes
- Added null-conditional operator (
?.) to theElementproperty getter to prevent dereferencing a null_viewHandlerWrapperduring early lifecycle events - Added explanatory comment documenting the iPadOS 26.1+ behavior that necessitates this defensive code
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Description of Change
On iPadOS 26.1+,
TabbedPagecrashes withNullReferenceExceptionin windowed apps < 667pt width. iOS 26.1 introduced earlyViewDidLayoutSubviews()calls duringUITabBarControllerbase constructor execution for narrow viewports, before_viewHandlerWrapperinitialization completes.Fix: Add null-conditional operator to
Elementproperty getter:The existing
if (Element is IView view)guard inViewDidLayoutSubviews()handles null safely.Issues Fixed
Fixes #32661
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