UIScreen(屏幕)、UIWindow(画框)、UIView(画布)、didFinishLaunchingWithOptions的概念
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//didFinishLaunchingWithOptions 方法:顾名思义。在app开始运行时会调用里面的方法。
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
//返回的是带有状态栏的矩形
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
CGRect bound = [[UIScreen mainScreen]bounds]; //返回的是带有状态栏的Rect
NSLog(@"boundwith:%f boundheight:%f",bound.size.width,bound.size.height);
NSLog(@"boundx:%f boundy:%f",bound.origin.x,bound.origin.y);
//2012-08-03 23:21:45.716 DinkMixer[599:c07] boundwith:320.000000 boundheight:480.000000
//2012-08-03 23:21:45.719 DinkMixer[599:c07] boundx:0.000000 boundy:0.000000
CGRect appBound = [[UIScreen mainScreen]applicationFrame]; //返回的是不带有状态栏的Rect
NSLog(@"appBoundwith:%f boundheight:%f",appBound.size.width,appBound.size.height);
NSLog(@"appBoundx:%f boundy:%f",appBound.origin.x,appBound.origin.y);
//2012-08-03 23:21:45.720 DinkMixer[599:c07] appBoundwith:320.000000 boundheight:460.000000
//2012-08-03 23:21:45.720 DinkMixer[599:c07] appBoundx:0.000000 boundy:20.000000
//很明显状态栏占用了空间20像素
MasterViewController *masterViewController = [[[MasterViewController alloc] initWithNibName:@"MasterViewController" bundle:nil] autorelease]; //根据nib文件的名称来创建一个视图控制器
self.navigationController = [[[UINavigationController alloc] initWithRootViewController:masterViewController] autorelease]; //创建一个导航控制器,并指定该导航控制器的根视图控制器为上面建立的masterViewController
self.window.rootViewController = self.navigationController;// 窗体(window)有一个根视图控制器——这个视图控制器负责配置当窗体显示时最先显示的视图。要让你的视图控制器的内容显示在窗体中,需要去设置窗体的根视图控制器为你的视图控制器。
[self.window makeKeyAndVisible];//这行代码会让包含了视图控制器视图的Window窗口显示在屏幕上。
return YES;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOp
{
}
转载自:http://blog.sina.com.cn/s/blog_74f70b7901017f9t.html
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