My app doesn't respond on iPhone Air iOS 26.1.

Question

Created Nov ’25

Replies 7

Boosts 3

Participants 4

My app doesn't respond on iPhone Air iOS 26.1. After startup, my app shows the main view with a tab bar controller containing 4 navigation controllers. However, when a second-level view controller is pushed onto any navigation controller, the UI freezes and becomes unresponsive. The iPhone simulator running iOS 26.1 exhibits the same problem.

The debug profile shows CPU usage at 100%.

However, other devices and simulators do not have this problem.

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Answered by viktor_runcoach in 869334022

As ray_cai outlined the issue was related to the LaunchImage.

@howard_kang this fixed the issue for me.

Remove LaunchImage from the Asset catalog.
Remove references to LaunchImage from your build settings.
Add Launch Screen storyboard to the project.
Add parameter Launch screen interface file base name with the name of your storyboard Launch Screen.storyboard to your Info.plist file.

Boost

Answer 1

viktor_runcoach OP

Dec ’25

I am running into the same issue, have not found a solution yet. It seems to happen during the Liquid Glass animation transition.

I'm not able to disable the new Liquid Glass UI using this flag UIDesignRequiresCompatibility are you?

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Answer 2

DTS Engineer OP

Apple

Dec ’25

@viktor_runcoach and @howard_kang , thanks for both post, so when we have 2 reports is good to compare the issue. Both are using the iPhone Air simulator with iOS 26.1 and both are on Xcode 26.1. Am I correct?

https://developer.apple.com/forums/thread/809465?answerId=868722022#868722022

Can you please download Xcode 26.2 beta and try exactly the same thing?

Lets get to the bottom of this issue.

Albert Pascual   Worldwide Developer Relations.

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Answer 3

viktor_runcoach OP

Dec ’25

Albert, I have downloaded Xcode 26.2 (17C48), the issue exists and is isolated to the iPhone Air. Both iPhone Air 26.2 and 26.1 simulators have this issue.

Other simulators on Xcode 26.2 remain free of this issue.

Let me know if there is additional information I can provide.

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Answer 4

DTS Engineer OP

Apple

Dec ’25

@viktor_runcoach thanks for letting me know, I didn't see the issue when I use Xcode 26.2 beta and the simulator for iPhone Air, but it means I need to get a real device and start trying to reproduce it. However is very important if you can file a bug using a focus sample showing the issue.

Once you open the bug report, please post the FB number here for my reference.

If you have any questions about filing a bug report, take a look at Bug Reporting: How and Why?

Above all, thanks for providing all this. Looking forward your bug to get to the bottom of the issue.

Albert Pascual   Worldwide Developer Relations.

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Answer 5

viktor_runcoach OP

Dec ’25

Accepted Answer

As ray_cai outlined the issue was related to the LaunchImage.

@howard_kang this fixed the issue for me.

Remove LaunchImage from the Asset catalog.
Remove references to LaunchImage from your build settings.
Add Launch Screen storyboard to the project.
Add parameter Launch screen interface file base name with the name of your storyboard Launch Screen.storyboard to your Info.plist file.

1

Answer 6

howard_kang OP

Dec ’25

@DTS Engineer , I use xcode 26.2 and iPhone Air simulator with iOS 26.2 , issue still exists. iShot_2025-12-15_17.09.37.png

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Answer 7

xnicolle OP

1d

⏺ That's it. The fix is:

Removed ASSETCATALOG_COMPILER_LAUNCHIMAGE_NAME = LaunchImage from both Debug and Release build settings
Added UILaunchStoryboardName = LaunchScreen to Info.plist

Without a proper launch storyboard, UIKit falls back to a legacy compatibility mode that computes wrong screen dimensions on iPhone Air — causing the fractional tab bar height and the infinite layout loop. The LaunchScreen.storyboard already existed in the project but was never referenced.

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