iOS 18.4 Warning for Non-Scene-Based Apps

Overview

iOS 18.4 introduces runtime warnings for applications that haven’t yet adopted the scene-based app lifecycle. This warning indicates that in a future iOS update, this will become an assertion, which could affect your app’s functionality.

Major Changes

• Runtime warnings appear for apps not using scene-based lifecycle
• This warning will become an assertion in a future iOS update
• Affects apps still using only the traditional AppDelegate model without SceneDelegate

Developer Action Required

iOS developers should update their applications to implement the scene-based lifecycle model, which was introduced in iOS 13. This model allows apps to have multiple windows or scenes, each with its own lifecycle.

The migration involves:****

1. Adopting UISceneDelegate and UIWindowSceneDelegate
2. Moving window-related code from AppDelegate to SceneDelegate
3. Updating Info.plist to include UIApplicationSceneManifest

Deprecation Details

The traditional app lifecycle using only AppDelegate is being phased out in favor of the more flexible scene-based model. Apple is now actively warning developers about this transition, which will become mandatory in a future iOS update.