引用AppDelegate实例变量 [英] Referencing AppDelegate instance variables

问题描述

我有一个基于导航应用程序模板的项目。
在AppDelegate中有方法 -applicationDidFinishLoading：和 -applicationWillTerminate：。在这些方法中，我加载和保存应用程序数据，并将其存储在一个实例变量（实际上是一个对象图）。

I have a project that is based on the Navigation Based Application template. In the AppDelegate are the methods -applicationDidFinishLoading: and -applicationWillTerminate:. In those methods, I am loading and saving the application data, and storing it in an instance variable (it is actually an object-graph).

它加载MainWindow.xib，它有一个NavigationConroller，它又有一个RootViewController。 RootViewController nibName 属性指向RootView（我的实际控制器类）。

When the application loads, it loads MainWindow.xib, which has a NavigationConroller, which in turn has a RootViewController. The RootViewController nibName property points to RootView (my actual controller class).

在我的类中，到我在 -applicationDidFinishLoading：方法中创建的对象，以便我可以获得对它的引用。

In my class, I wish to refer to the object that I created in the -applicationDidFinishLoading: method, so that I can get a reference to it.

任何人都可以告诉我该怎么做？我知道如何引用我以编程方式创建的对象，但我似乎无法找出来回我的方式，因为中间的步骤是从NIB文件内完成。

Can anyone tell me how to do that? I know how to reference between objects that I have created programmatically, but I can't seem to figure out to thread my way back, given that the middle step was done from within the NIB file.

推荐答案

对于我需要在应用程序中的任何地方访问它的变量（通常是模型数据结构），在AppDelegate类中声明它们。当你需要引用它：

For variables (usually the model data structure) which I need to access it anywhere in the app, declare them in your AppDelegate class. When you need to reference it:

YourAppDelegate *appDelegate = (YourAppDelegate *)[[UIApplication sharedApplication] delegate];
//and then access the variable by appDelegate.variable 

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