從應用程序代理在應用程序窗口添加標籤

Question

我使用的是Xcode 4.5和iOS 6.0，我從xcode中選擇了默認的單一視圖模板，我只是想在應用程序窗口上添加標籤，但我無法做到這一點。請糾正我。

- (BOOL)application:(UIApplication *)application 
didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{ 
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; 
// Override point for customization after application launch. 
self.viewController = [[ViewController alloc] initWithNibName:@"ViewController"  bundle:nil]; 
self.window.rootViewController = self.viewController; 
label =[[UILabel alloc] initWithFrame:CGRectMake(100, 100, 200, 20)]; 
label.text = @"Test"; 
[label setBackgroundColor:[UIColor whiteColor]]; 
[self.window addSubview:label]; 
[self.window bringSubviewToFront:label]; 
[self.window makeKeyAndVisible]; 
return YES; 
} 

PS - 我想我在我的ViewController觀點，即在窗口的頂部標籤所以這將是永遠存在的，儘管通過窗口提出的意見修改。我不想只在這裏顯示標籤。

我得到了答案

[self.window.rootViewController.view addSubview:label]; 

感謝所有給予指針。

Answer 1

只是刪除RootviewController。

- (BOOL)application:(UIApplication *)application 
didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{ 
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; 
// Override point for customization after application launch. 

label =[[UILabel alloc] initWithFrame:CGRectMake(100, 100, 200, 20)]; 
label.text = @"Test"; 
[label setBackgroundColor:[UIColor whiteColor]]; 
[self.window addSubview:label]; 
[self.window bringSubviewToFront:label]; 
[self.window makeKeyAndVisible]; 
return YES; 
} 

如果你不想只在這裏顯示標籤，然後像下面一樣使用。

self.viewController = [[ViewController alloc] initWithNibName:@"ViewController"  bundle:nil]; 
self.window.rootViewController = self.viewController; 


[self.Viewcontroller.view addSubview:label]; 

Answer 2

添加標籤self.window.rootViewController.view代替self.window

UILabel *label =[[UILabel alloc] initWithFrame:CGRectMake(100, 100, 200, 20)]; 
label.text = @"Test"; [label setBackgroundColor:[UIColor whiteColor]]; 
[self.window.rootViewController.view addSubview:label];