Question

我正在使用Xcode 4.5和iOS 6.0，我从xcode中选择了默认的单一视图模板，我只想在应用程序窗口中添加标签，但我无法这样做。请纠正我。

- (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 - 我希望我的标签位于我的ViewController视图之上，即在窗口上，所以尽管窗口显示的视图发生了变化，它仍然会在那里。我不想只在这里显示标签。

我得到了答案

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

感谢所有人提供指示。

Answer 1

只需删除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;
}

如果你不想只在这里显示标签，请使用如下所示。

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


[self.Viewcontroller.view addSubview:label];

Answer 2

将标签添加到self.window.rootViewController.view而不是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];

从app delegate在Application Window上添加Label

2 个答案: