查看浮动在所有ViewControllers上方 [英] View floating above all ViewControllers
问题描述
在iOS上是否可以将视图始终浮动在所有其他视图之上。我问这个是因为我想要实现的是一个浮动在ViewController上方的视图,然后一个模态视图控制器滑入,而该特定视图仍然漂浮在该模态视图控制器上(希望你得到我想说的话) )。
Is it possible on iOS that a view always floats above all other views. I ask this because what I would like to achieve is a view that floats above a ViewController, and then a Modal View Controller slides in, whilst that particular view is still floating over that Modal View Controller (hope you get what I am trying to say).
推荐答案
有。您可以将视图添加到主窗口
,并在必要时将其显示在前面。
There is. You can add your view to the main window
and bring it to front when you have to.
在以下代码中假定 _viewConroller
和 _anotherView
是appDelegate的强大属性 - 配置当然可能不同。
In following code is presumed that _viewConroller
and _anotherView
are strong properties of appDelegate - configuration could of course be different.
此代码会在屏幕左上角添加小蓝色方块。
This code would add small blue square on top left corner of the screen.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
_viewController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];
_anotherView = [[UIView alloc] initWithFrame: CGRectMake (0.0,0.0,20.0,20.0)];
[anotherView setBackgroundColor: [UIColor blueColor]];
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
[self.window addSubView: _anotherView];
[self.window bringSubViewToFront: _anotherView]; //not really needed here but it doesn't do any harm
return YES;
}
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