@class in iOS

What is @class

• By using this preprocessor directive we can provide forward declaration of any other class without using inheritance.
• In implementation when we required to create a object of a class in other class without using inheritance then recommended to go for ‘@class’.
• UIResponder class will provide event handling process by using user action.
• UIApplicationDelegate is a protocol which allows to implement app life cycle related method.
• AppDelegate is a current application delegate class which is inherited from UIResponder and UIApplication.
• A view is a visual object that creates user interface of an iOS Application.
• Views are defines within a specific rectangle area of a screen.
• All views are subclass of UIKit,UIView classes.
• UIWindow class provides the surfaces on screen which allow to add view components to display.
• In any kind of iOS application only one UIWindow object is avilable.
• We can not place any kind of UIControllers directly on UIWindow.
• UIWinodw must be fit entire screen of the device.
• UIView class provide model UI for displaying the content view.
• viewController class is a subclass of UIViewController which allows to add any type of UIControllers.
• AppDelegate is a subclass of UIResponder which allows to handle surface and App Life Cycle event.

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