UIScreen,UIView,UIWindow和UIViewController的介绍和区别

最新推荐文章于 2018-05-12 16:52:20 发布

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最新推荐文章于 2018-05-12 16:52:20 发布

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分类专栏： iOS xcode

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一、参考

View Programming Guide for iOS

http://developer.apple.com/library/ios/#documentation/WindowsViews/Conceptual/ViewPG_iPhoneOS/Introduction/Introduction.html

View Controller Programming Guide for iOS

http://developer.apple.com/library/ios/#featuredarticles/ViewControllerPGforiPhoneOS/Introduction/Introduction.html

UIScreen Class Reference

http://developer.apple.com/library/ios/#documentation/UIKit/Reference/UIScreen_Class/Reference/UIScreen.html

UIView Class Reference

http://developer.apple.com/library/ios/#documentation/UIKit/Reference/UIView_Class/UIView/UIView.html

UIWindow Class Reference

http://developer.apple.com/library/ios/#documentation/UIKit/Reference/UIWindow_Class/UIWindowClassReference/UIWindowClassReference.html

UIViewController Class Reference

http://developer.apple.com/library/ios/#documentation/UIKit/Reference/UIViewController_Class/Reference/Reference.html

二、区别

1、UIScreen可以获取设备屏幕的大小。

 
         // 整个屏幕的大小 {{0, 0}, {320, 480}} 
        
         CGRect bounds = [UIScreen mainScreen].bounds; 
        
         NSLog(@ 
         "UIScreen bounds: %@" 
         , NSStringFromCGRect(bounds)); 
        
         // 应用程序窗口大小 {{0, 20}, {320, 460}} 
        
         CGRect applicationFrame = [UIScreen mainScreen].applicationFrame; 
        
         NSLog(@ 
         "UIScreen applicationFrame: %@" 
         , NSStringFromCGRect(applicationFrame));

2、UIView对象定义了一个屏幕上的一个矩形区域，同时处理该区域的绘制和触屏事件。
可以在这个区域内绘制图形和文字，还可以接收用户的操作。一个UIView的实例可以包含和管理若干个子UIView。

ViewController.m

 
         - ( 
         void 
         )viewDidAppear:( 
         BOOL 
         )animated 
        
         { 
        
         [super viewDidAppear:animated]; 
        
         UIView* myView = [[UIView alloc] initWithFrame:CGRectMake(10, 10, 100, 100)]; 
        
         myView.backgroundColor=[UIColor redColor]; 
        
         [self.view addSubview:myView]; 
        
         }

3、UIWindow对象是所有UIView的根，管理和协调的应用程序的显示
UIWindow类是UIView的子类，可以看作是特殊的UIView。一般应用程序只有一个UIWindow对象，即使有多个UIWindow对象，也只有一个UIWindow可以接受到用户的触屏事件。

AppDelegate.m

 
         - ( 
         BOOL 
         )application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
        
         { 
        
         UIWindow *myWindow = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; 
        
         myWindow.backgroundColor=[UIColor whiteColor]; 
        
         [myWindow makeKeyAndVisible]; 
        
         _window = myWindow; 
        
         return 
          YES; 
        
         }

4、UIViewController对象负责管理所有UIView的层次结构，并响应设备的方向变化。

AppDelegate.m

 
         - ( 
         BOOL 
         )application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
        
         { 
        
         UIWindow *myWindow = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; 
        
         myWindow.backgroundColor=[UIColor whiteColor]; 
        
         UIViewController *myViewController = [[UIViewController alloc] initWithNibName:nil bundle:nil]; 
        
         myWindow.rootViewController = myViewController; 
        
         [myWindow makeKeyAndVisible]; 
        
         _window = myWindow; 
        
         return 
          YES; 
        
         }

三、完整的代码

 
         // ViewController.h 
        
         #import <UIKit/UIKit.h> 
        
         @interface ViewController : UIViewController 
        
         @end 
        
         // ViewController.m 
        
         #import "ViewController.h" 
        
         @implementation ViewController 
        
         - ( 
         void 
         )viewDidAppear:( 
         BOOL 
         )animated { 
        
         [super viewDidAppear:animated]; 
        
         UIView* myView = [[UIView alloc] initWithFrame:CGRectMake(10, 10, 100, 50)]; 
        
         myView.backgroundColor=[UIColor redColor]; 
        
         [self.view addSubview:myView]; 
        
         } 
        
         - ( 
         BOOL 
         )shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { 
        
         return 
          YES; 
        
         } 
        
         @end 
        
         // AppDelegate.h 
        
         #import <UIKit/UIKit.h> 
        
         @ 
         class 
          ViewController; 
        
         @interface AppDelegate : UIResponder <UIApplicationDelegate> 
        
         @property (strong, nonatomic) UIWindow *window; 
        
         @property (strong, nonatomic) ViewController *viewController; 
        
         @end 
        
         // AppDelegate.m 
        
         #import "AppDelegate.h" 
        
         #import "ViewController.h" 
        
         @implementation AppDelegate 
        
         @synthesize window = _window; 
        
         @synthesize viewController = _viewController; 
        
         - ( 
         BOOL 
         )application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
        
         { 
        
         self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; 
        
         self.viewController = [[ViewController alloc] initWithNibName:nil bundle:nil];  
        
         self.window.rootViewController = self.viewController; 
        
         [self.window makeKeyAndVisible]; 
        
         return 
          YES; 
        
         } 
        
         @end 
        
         // main.m 
        
         #import <UIKit/UIKit.h> 
        
         #import "AppDelegate.h" 
        
         int 
          main( 
         int 
          argc,  
         char 
          *argv[]) { 
        
         @autoreleasepool { 
        
         return 
          UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate  
         class 
         ])); 
        
         } 
        
         }

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UIScreen,UIView,UIWindow和UIViewController的介绍和区别

一、参考View Programming Guide for iOShttp://developer.apple.com/library/ios/#documentation/WindowsViews/Conceptual/ViewPG_iPhoneOS/Introduction/Introduction.htmlView Controller Programmin
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