Migrating to the UIKit scene-based life cycle

Question

sana OP

Created 4d

Replies 2

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Participants 2

I got this debuglog in Xcode26.

"UIScene lifecycle will soon be required. Failure to adopt will result in an assert in the future."

I haven't included any UIScene lifecycle code.

I read the article on TN3187: Migrating to the UIKit scene-based life cycle.

Does this mean that when iOS27 iPhone is released, the app will crash after startup?

If Xcode26/iOS27 crashes, is there a quick fix I can use?

Answered by DTS Engineer in 881979022

Hello sana,

As the technical note states:

Migrate to the scene-based life-cycle if your app meets either of the following conditions:

The UIApplicationSceneManifest key is missing from your Info.plist or it has no specified configurations.
You haven’t implemented the application(_:configurationForConnecting:options:) method in your app delegate.

If you are getting the debug message, it means that your app is affected by either of those conditions. Failing to adopt the scene-based life cycle in the next major iOS release will prevent the app from launching. To resolve this, please follow any of the solutions explained in TN3187. That would be the quickest fix.

Hoping this helps,

Richard Yeh  Developer Technical Support

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Answer 1

DTS Engineer OP

Apple

4d

Recommended

Hello sana,

As the technical note states:

Migrate to the scene-based life-cycle if your app meets either of the following conditions:

The UIApplicationSceneManifest key is missing from your Info.plist or it has no specified configurations.
You haven’t implemented the application(_:configurationForConnecting:options:) method in your app delegate.

If you are getting the debug message, it means that your app is affected by either of those conditions. Failing to adopt the scene-based life cycle in the next major iOS release will prevent the app from launching. To resolve this, please follow any of the solutions explained in TN3187. That would be the quickest fix.

Hoping this helps,

Richard Yeh  Developer Technical Support

0

Answer 2

sana OP

2d

Thank you for your response, Richard.

I have a follow-up question to clarify the exact trigger for the launch failure.

Could you tell us which of the following scenarios actually causes the app to fail to launch?

Built with Xcode 26 (iOS 26 SDK), run on an iOS 27 device — Does the app fail to launch simply because the device is running iOS 27, even though it was built with the older(=26) SDK?
Built with Xcode 27 (iOS 27 SDK), run on any OS version including iOS 27 — Does the failure occur across all OS versions, including iOS 27(All OS versions(iOS15 or higher) supported by my app), as long as the app was compiled with the iOS 27 SDK without adopting the scene-based life cycle?
Both of the above — Does the failure apply in either case?

Understanding whether this is enforced at the OS level (runtime) or at the SDK/build level (compile time) is critical for planning our migration and release timeline.

Thank you.

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