iPhone SDK - 通过UIViewController从AppDelegate显示UIView [英] iPhone SDK - Display a UIView from the AppDelegate over a UIViewController

问题描述

我希望我的标题有意义。

I hope my title makes sense.

我有一个iPhone应用程序使用标准的 UINavigationController

I have an iPhone app uses the standard UINavigationController approach to push new view controllers and let the user navigate as they wish.

现在，在我的 AppDelegate 中，我有一个方法在定时器上运行，该定时器调用Web服务。如果这个服务返回一个特定的响应，我想能够显示一个 UIView （本质上是一个自定义警报框，但我不想使用 UIAlertView class）。

Now, in my AppDelegate I have a method which runs on a timer, which calls out to a web service. If this service comes back with a particular response, I want to be able to display a UIView (essentially a custom alert box, but I don't want to use the UIAlertView class).

如何获得这个UIView（在 AppDelegate ）显示在 UIWindow 上，因此在导航控制器推送的任何和所有视图之上？ / p>


How can I get this UIView (defined in the AppDelegate) to display on the UIWindow - and therefore on top of any and all views which have been pushed by the navigation controller?

推荐答案

你的AppDelegate应该有一个属性 window 。窗口是一个视图，所以你可以做 [self.window addSubview：newView];

Your AppDelegate is supposed to have a property window. A window is a view, so you can do [self.window addSubview:newView];

添加到应用程序视图层次结构中的UIViews有一个属性 window ，指向同一个对象。所以一个视图控制器可以到达窗口而不处理应用程序委托。

Note: Also UIViews, that are added to the app's view hierarchy have a property window, pointing to the same object. So a view controller can reach the window without dealing with the app delegate.

[controller.view.window addSubview:overlayView];

确保这是在您设置 rootViewController 。您也可能需要 [self.window bringSubviewToFront：newView]

Make sure this is after you have set the rootViewController. Also you might need [self.window bringSubviewToFront: newView]

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