Thank you for the clarification. In our case, the solid blue background is a branding requirement and needs to extend continuously to the top edge. Is there a supported way to achieve this with UINavigationBarAppearance on iPhone Duo, without adding a custom background view? Or is the gap above the navigation bar expected behavior?

for below code: Text("Hello, world!") .accessibilityIdentifier("Text") I need to find the view with accessibilityIdentifier is 'Text', and get the Text sub view's frame; I have searched some solutions, like: 1.PreferenceKey + anchorPreference; 2.UIViewRepresentable; but this solutions require some additional code, can not find a sub view merely through the accessibilityIdentifier of the system.

Hi, Richard, thank you for your reply, I think we have found the root cause, thank you very much ^_^.

Hi, Richard, thank you for your reply, I have post a feedback: https://feedbackassistant.apple.com/feedback/21602362, and upload the fully symbolicated Apple crash report, and add more detailed info in this feedback, still unable to resolve the crash, hoping for your reply and suggestion, thanks.

Hi, Is this a bug or a change in system behavior? If it is a behavioral change, is there any document to explain it.

Hi, issue still occurs in the iPadOS 26.6 Beta6(23A5318c), or can you suggest how to fix this issue, thank you~

Hi, I have filed a feedback, the number is: FB19396112

Hi, I have post a feedback report: FB19221991(https://feedbackassistant.apple.com/feedback/19221991)

Not yet. May I ask if you have found a solution

Hi, before you call setViewControllers, should check if ViewController's view has loaded: guard isViewLoaded else { return }

Hi, my next post include the sample code, please look at that code and see if you can find any problems, thank you~

Hi, I have send a feedback and upload a sample project, please help to analyze: FB15953241 (Fatal Exception: NSInternalInconsistencyException Attempting to select a view controller that isn't a child! (null)) Thank you very much.