Explain the stages of development and functioning of an iOS application from launch to shutdown.

The lifecycle of an iOS application includes several stages:

1. Application Launch — the iOS system loads the app into memory and calls the main() function, which starts the event processing loop.

2. Initialization — an UIApplication object and the application delegate (AppDelegate) are created. Initial setup occurs in the application(_:didFinishLaunchingWithOptions:) method.

3. Active State — the app becomes active, and the applicationDidBecomeActive(_:) method is called. The app is now ready for user interaction.

4. Background States — when the app is minimized, the applicationWillResignActive(_:) and applicationDidEnterBackground(_:) methods are called. During this time, the app can save data and release resources.

5. Returning to Active State — when returning to the app, applicationWillEnterForeground(_:) and then applicationDidBecomeActive(_:) are called.

6. Termination — when the app is closed, applicationWillTerminate(_:) is called, where final operations can be performed.

The entire cycle is managed by the iOS system, and the developer implements delegate methods to handle state transitions and resource management.