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Q:

What is the use of controller object UIApplication?

Answer

Controller object UIApplication is used without subclassing to manage the application event loop.


It coordinates other high-level app behaviors. 


It works along with the app delegate object which contains app-level logic.

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Subject: Application Development

Q:

Which object is create by UIApplicationMain function at app launch time?

Answer

The app delegate object is created by UIApplicationMain function at app launch time. The app delegate object's main job is to handle state transitions within the app.

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Subject: IOS