Agent skill

iOS App Lifecycle

Standards for AppDelegate, SceneDelegate, Deep Linking, and Background Tasks.

View SKILL.md on GitHub Repository
Stars 163
Forks 31

Install this agent skill to your Project

npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/other/other/app-lifecycle

Metadata

Additional technical details for this skill

labels
ios lifecycle scenedelegate background-tasks
triggers 
{
    "files": [
        "AppDelegate.swift",
        "SceneDelegate.swift"
    ],
    "keywords": [
        "didFinishLaunchingWithOptions",
        "willConnectTo",
        "backgroundTask",
        "Shortcut",
        "UserActivity"
    ]
}

SKILL.md

iOS App Lifecycle Standards

Priority: P0

Implementation Guidelines

App & Scene Delegate

  • SceneDelegate: Use for UI windows and scene-specific state in iOS 13+.
  • AppDelegate: Focus on app-wide setup (DI, Analytics, Push notification registration).
  • Slim Delegates: Move initialization logic to dedicated Bootstrapper or AppCoordinator.

Deep Linking

  • Universal Links: Prefer over custom URL schemes. Handle via scene(_:continue:userActivity:).
  • Handling logic: Routing should be handled by the Root Coordinator to navigate to specific screens.

Background Tasks

  • Background Fetch: Use BGTaskScheduler for periodically refreshing data.
  • Expiration: Handle expirationHandler to avoid app kill by the system.

Anti-Patterns

  • Fat AppDelegate: **No complex logic in didFinishLaunching**: Use a Bootstrapper service.
  • Direct UI in AppDelegate: **No UIWindow setup in AppDelegate**: Use SceneDelegate for iOS 13+.
  • Blocking Launch: **No synchronous network calls in launch**: Move to background thread or defer.

References

  • Lifecycle & Background Tasks

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