About

This reference will tell you the order in which UIApplicationDelegate methods are called based on the action performed and the current state of the app.

Definitions

Not Loaded is defined as the app not being in memory at all.

Backgrounded is defined as being in the background (not yet purged from memory).

This data was gathered using iOS 11.0.3

Actions

• Launching the app
• Backgrounding the app
• Open Universal Link
• Open Deep Link
• Open Push Notification
• System Alert Displayed
• Background Fetch

Launching the app - from Not Loaded

1. applicationWillChangeStatusBarFrame: Inactive
2. applicationDidChangeStatusBarFrame: Inactive
3. applicationSupportedInterfaceOrientationsFor: Inactive
4. applicationSupportedInterfaceOrientationsFor: Inactive
5. applicationSupportedInterfaceOrientationsFor: Inactive
6. applicationSupportedInterfaceOrientationsFor: Inactive
7. applicationWillFinishLaunchingWithOptions: Inactive - LaunchOptions: nil
8. applicationDidFinishLaunchingWithOptions: Inactive - LaunchOptions: nil
9. applicationSupportedInterfaceOrientationsFor: Inactive
10. applicationSupportedInterfaceOrientationsFor: Inactive
11. applicationSupportedInterfaceOrientationsFor: Inactive
12. applicationDidBecomeActive: Active

Launching the app - from Backgrounded

1. applicationWillEnterForeground: Background
2. applicationDidBecomeActive: Active

Backgrounding the app - from Active

1. applicationWillResignActive: Active
2. applicationDidEnterBackground: Background
3. applicationShouldSaveApplicationState: Background
4. applicationWillEncodeRestorableStateWith: Background
5. applicationSupportedInterfaceOrientationsFor: Background

Universal Link - from Not Loaded

1. applicationWillChangeStatusBarFrame: Inactive
2. applicationDidChangeStatusBarFrame: Inactive
3. applicationSupportedInterfaceOrientationsFor: Inactive
4. applicationSupportedInterfaceOrientationsFor: Inactive
5. applicationSupportedInterfaceOrientationsFor: Inactive
6. applicationSupportedInterfaceOrientationsFor: Inactive
7. applicationWillFinishLaunchingWithOptions: Inactive - LaunchOptions: { UIApplicationLaunchOptionsUserActivityIdentifierKey = "748F80DF-639A-4013-A8E6-F174E99DEE03"; UIApplicationLaunchOptionsUserActivityKey = "<NSUserActivity: 0x1c0023ba0>"; UIApplicationLaunchOptionsUserActivityTypeKey = NSUserActivityTypeBrowsingWeb; }
8. applicationShouldRestoreApplicationState: Inactive
9. applicationDidDecodeRestorableStateWith: Inactive
10. applicationDidFinishLaunchingWithOptions: Inactive - LaunchOptions: { UIApplicationLaunchOptionsUserActivityIdentifierKey = "748F80DF-639A-4013-A8E6-F174E99DEE03"; UIApplicationLaunchOptionsUserActivityKey = "<NSUserActivity: 0x1c0023ba0>"; UIApplicationLaunchOptionsUserActivityTypeKey = NSUserActivityTypeBrowsingWeb; }
11. applicationSupportedInterfaceOrientationsFor: Inactive
12. applicationSupportedInterfaceOrientationsFor: Inactive
13. applicationSupportedInterfaceOrientationsFor: Inactive
14. applicationWillContinueUserActivityWithType: Inactive
15. applicationContinueUserActivityRestorationHandler: Inactive
16. applicationDidBecomeActive: Active

Universal Link - from Backgrounded

1. applicationWillEnterForeground: Background
2. applicationWillContinueUserActivityWithType: Inactive
3. applicationContinueUserActivityRestorationHandler: Inactive
4. applicationDidBecomeActive: Active

Deep Link - from Not Loaded

1. applicationWillChangeStatusBarFrame: Inactive
2. applicationDidChangeStatusBarFrame: Inactive
3. applicationSupportedInterfaceOrientationsFor: Inactive
4. applicationSupportedInterfaceOrientationsFor: Inactive
5. applicationSupportedInterfaceOrientationsFor: Inactive
6. applicationSupportedInterfaceOrientationsFor: Inactive
7. applicationWillFinishLaunchingWithOptions: Inactive - LaunchOptions: { UIApplicationLaunchOptionsURLKey: appLaunchSeq://whatup }
8. applicationDidFinishLaunchingWithOptions: Inactive - LaunchOptions: { UIApplicationLaunchOptionsURLKey: appLaunchSeq://whatup }
9. applicationSupportedInterfaceOrientationsFor: Inactive
10. applicationSupportedInterfaceOrientationsFor: Inactive
11. applicationSupportedInterfaceOrientationsFor: Inactive
12. applicationOpenURL: Inactive URL:appLaunchSeq://whatup
13. applicationDidBecomeActive: Active

Deep Link - from Backgrounded

1. applicationWillEnterForeground: Background
2. applicationOpenURL: Inactive URL:appLaunchSeq://whatup
3. applicationDidBecomeActive: Active

Push Notification - from Not Loaded

1. applicationWillChangeStatusBarFrame: Inactive
2. applicationDidChangeStatusBarFrame: Inactive
3. applicationSupportedInterfaceOrientationsFor: Inactive
4. applicationSupportedInterfaceOrientationsFor: Inactive
5. applicationSupportedInterfaceOrientationsFor: Inactive
6. applicationSupportedInterfaceOrientationsFor: Inactive
7. applicationWillFinishLaunchingWithOptions: Inactive - LaunchOptions: [__C.UIApplicationLaunchOptionsKey(_rawValue: UIApplicationLaunchOptionsRemoteNotificationKey): { aps = { alert = "Hi Sean!"; badge = 1; sound = default; }; }]
8. applicationShouldRestoreApplicationState: Inactive
9. applicationDidDecodeRestorableStateWith: Inactive
10. applicationDidFinishLaunchingWithOptions: Inactive - LaunchOptions: [__C.UIApplicationLaunchOptionsKey(_rawValue: UIApplicationLaunchOptionsRemoteNotificationKey): {
    aps = { alert = "Hi Sean!"; badge = 1; sound = default; }; }]
11. applicationSupportedInterfaceOrientationsFor: Inactive
12. applicationSupportedInterfaceOrientationsFor: Inactive
13. applicationSupportedInterfaceOrientationsFor: Inactive
14. applicationDidReceiveRemoteNotification: Inactive
15. applicationDidBecomeActive: Active

Push Notification - from Backgrounded

1. applicationWillEnterForeground: Background
2. applicationDidReceiveRemoteNotification: Inactive
3. applicationDidBecomeActive: Active

System Alert Displayed

(e.g. when asking for notification privileges)

1. applicationWillResignActive: Active
2. applicationDidBecomeActive: Active

Background Fetch - from Not Loaded

1. applicationWillChangeStatusBarFrame: Background
2. applicationDidChangeStatusBarFrame: Background
3. applicationSupportedInterfaceOrientationsFor: Background
4. applicationSupportedInterfaceOrientationsFor: Background
5. applicationSupportedInterfaceOrientationsFor: Background
6. applicationSupportedInterfaceOrientationsFor: Background
7. applicationWillFinishLaunchingWithOptions: Background - LaunchOptions: nil
8. applicationDidFinishLaunchingWithOptions: Background - LaunchOptions: nil
9. applicationSupportedInterfaceOrientationsFor: Background
10. applicationSupportedInterfaceOrientationsFor: Background
11. applicationSupportedInterfaceOrientationsFor: Background
12. applicationPerformFetchWithCompletionHandler: Background