IOS Development Learning User Interface (2) UIWindow windows

UIWindow windows

A. All UI is placed directly or indirectly on the UIWindow.

B. UIWindow inherits from UIView.

C. Creation of Windows: Initializes a Window object, specifying its size, specified in the Home screen ([UIScreen mainscreen]) range.

D. Set the Windows as the main window and make them visible [window makekeyandvisible]; An application has only one main window.

/*

Appdelegate.m

-(BOOL) Application: (UIApplication *) application didfinishlaunchingwithoptions: (Nsdictionary *) written in LaunchOptions method

*/

Create an application window

Self.window = [[UIWindow alloc] initwithframe:[[uiscreen mainscreen] bounds]];

Self.window.backgroundColor = [Uicolor Whitecolor];

Make Widows a key window display

[Self.window makekeyandvisible];

Initialize a Viewcontroller

Firstviewcontroller *FIRSTVC = [[Firstviewcontroller alloc] init];

Assign to window, FIRSTVC as the root View Controller of window

Self.window.rootViewController = FIRSTVC;

IOS Development Learning User Interface (2) UIWindow windows