app crash on iOS 16.1(beta) when using "self.navigationController.navigationBarHidden = NO"

Question

Created Sep ’22

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My app was built with XCode13 and we are now seeing occasional crashes on iOS16.1 (beta). This exception occurs when using the method：

self.navigationController.navigationBar.hidden = NO

The following is the exception information:

Terminating app due to uncaught exception 'NSGenericException', reason: 'Unable to activate constraint with anchors <NSLayoutDimension:0x28130fd00 "_UINavigationBarTitleControl:0x112523b40.height"> and <NSLayoutDimension:0x281308340 "UILayoutGuide:0x283f97100'TitleViewGuide(0x112619390)'.height"> because they have no common ancestor. Does the constraint or its anchors reference items in different view hierarchies? That's illegal.'

Answered by Namegol in 728713022

if (@available(iOS 16.1, *)) {

[self.navigationBar setNeedsLayout];

[self.navigationBar layoutIfNeeded];

}

It can fix this problem. I found it's Apple's bug because the new Navigation Title in iOS 16 is TitleControl Class.

When you compile and run Xcode 13, it has a delay in updating constraints， It cause LayoutGuide's sosConstrain release(unsafe_unretained), So it caused a crash。

You can call the above two lines of code to let the navigation update the constraint layout of TitleControl immediately.

sosConstraint .png

Answer 1 · Sep 16, 2022 09:50 AM

Frameworks Engineer OP

Apple

Sep ’22

Can you post the version of the iOS 16.1beta you are running? (it should be something like 20A50(2 digit number)(letter))

Answer 2 · Sep 17, 2022 02:17 AM

wushuangrong OP

Sep ’22

The full crash stack:

Answer 3 · Sep 18, 2022 11:52 PM

WGH_ABC OP

Sep ’22

I have the same problem. The version of the iOS 16.1 is 20B5045d.

Answer 4 · Sep 19, 2022 04:27 AM

p.tanaev OP

Sep ’22

Have same error. And setting:

navigationItem.titleView = UIView() works for me

Looks like there is a title/view required in new navigationView stack implementation

Answer 5 · Sep 19, 2022 05:12 AM

Namegol OP

Sep ’22

Accepted Answer

if (@available(iOS 16.1, *)) {

[self.navigationBar setNeedsLayout];

[self.navigationBar layoutIfNeeded];

}

It can fix this problem. I found it's Apple's bug because the new Navigation Title in iOS 16 is TitleControl Class.

When you compile and run Xcode 13, it has a delay in updating constraints， It cause LayoutGuide's sosConstrain release(unsafe_unretained), So it caused a crash。

You can call the above two lines of code to let the navigation update the constraint layout of TitleControl immediately.

sosConstraint .png