使用App Delegate访问通过Storyboard创建的视图控制器 [英] Accessing a view controller created through Storyboard using the App Delegate

问题描述

我正在使用storyboard开发iOS5应用程序，我在视图控制器类中有一个方法，我想从App Delegate访问。麻烦的是，这个视图控制器通过故事板中的标签栏控制器进行实例化，因此App Delegate无法直接调用我想要的方法...

I'm working on an iOS5 app using storyboard, and I have a method in a view controller class that i'd like to access from the App Delegate. The trouble is, this view controller gets instantiated via a tab bar controller in storyboard, so the App Delegate has no direct way of calling the method I want...

For一个视图控制器与App Delegate联系，所有人必须做的就是使用：

For a view controller to get in touch with the App Delegate, all one has to do is use:

MyAppDelegate *appDelegate = (MyAppDelegate *)[[UIApplication sharedApplication] delegate];

是否有类似的简单方法指向已经实例化的视图控制器或类？

Is there a similarly easy way of pointing to an already-instantiated view controller or class?

推荐答案

您必须从应用委托中遍历视图层次结构。假设 AppDelegate 包含对 UITabBarController 的引用，您可以使用 viewControllers property或 selectedViewController 属性以进入您的视图控制器。

You'll have to traverse the view hierarchy from the app delegate. Assuming the AppDelegate holds a reference to the UITabBarController, you could use the viewControllers property or selectedViewController property to get to your view controller.

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