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Incorrect behaviour when trying to change focus to a focused view inside UIPageViewController
We are experiencing difficulties with keyboard navigation focus within a view contained inside a UIPageViewController. The intended keyboard navigation sequence does not function as expected. Expected Behavior: Pressing the Tab key once should move the focus to the UIPageViewController, allowing the use of the Up and Down arrow keys to navigate between pages. Pressing the Tab key a second time should shift the focus outside the UIPageViewController Pressing the Tab key a third time should move the focus back to the UIPageViewController. Actual Behavior: The focus does not shift as described above. Have sent a sample Xcode project to Apple demonstrating the issue (unfortunately it doesn't allow me to attach the zipped project here for some reason). STEPS TO REPRODUCE Set a breakpoint at viewDidAppear (line 44, MyViewController) Run the app, wait until it stops, and run the command in the lldb debugger Command: po UIFocusDebugger.checkFocusability(for: pager.viewControllers!.first!.view.subviews.first!) Output: The following issues were found that would prevent this item from being focusable: - ISSUE: One or more ancestors have issues that may be preventing this item from being focusable. Details: <_UIQueuingScrollView: 0x104826a00>: - ISSUE: This view returns YES from -canBecomeFocused, which will prevent its subviews from being focusable. <_UIPageViewControllerContentView: 0x103d07be0>: - ISSUE: This view returns YES from -canBecomeFocused, which will prevent its subviews from being focusable.
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Sep ’24