Q.24 What is @class.? Ans:-
- By using this preprocessor directive we can provide forword 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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