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IOS开发中的UIScreen、UIView、UIWindow和UIViewController

发布时间:2016-12-3 6:23:00 编辑:www.fx114.net 分享查询网我要评论
本篇文章主要介绍了"IOS开发中的UIScreen、UIView、UIWindow和UIViewController",主要涉及到IOS开发中的UIScreen、UIView、UIWindow和UIViewController方面的内容,对于IOS开发中的UIScreen、UIView、UIWindow和UIViewController感兴趣的同学可以参考一下。

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。 1 2 3 4 5 6 7 // 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 1 2 3 4 5 6 7 - ( 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 1 2 3 4 5 6 7 8 - ( 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 1 2 3 4 5 6 7 8 9 10 - ( 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 7 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 // 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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