Describe application states in iOS and also app lifecycle?

Ans:

Application States:

1. Not running
2. Inactive
3. Active

4. Background

5. Suspended

1. Not running:

Application is not yet all start by system or system also terminate app and move to not running state.

2. Inactive:

Application is in foreground but not receiving any events from the app.

Ex: Phone call, Message or Notification is received by system.

3. Active:

Application is in foreground and also receiving events from app.

This is normal state of an application.

4. Background:

Application is in background and also executing the code.

5. Suspended:

Application is in background. but not executing the code.

Application Lifecycle Methods:

1. application:WillFinishLanuch:WithOptions

2. application:DidFinishLanuch:WithOptions

3. application:WillEnterForeground:

4. application:DidBecomeActive

5. application:WillResignActive

6. application:DidEnterBackground

7. application:WillTerminate