iPhone 开发，如何以编程方式从另一个选项卡调用 NavigationController 后退按钮？
设置如下：
我有一个带有两个选项卡的选项卡栏控制器。第二个选项卡顶部有一个导航控制器，以便我可以查看表格中的详细信息。
在选项卡 #1 上，我有一个按钮。按下此按钮时，会将所选选项卡切换到选项卡 #2。
我的问题是这样的：假设我转到选项卡 #2，然后从表格中选择一行来查看详细信息。然后，我没有点击“后退”按钮返回基本视图，而是选择 tab#1。然后我按下按钮。 Tab#2 加载，但它仍然显示详细视图，而不是我想要的表格视图。
我知道如何以编程方式按下按钮。
[self.navigationController popViewControllerAnimated:YES];
但是，当按钮按下的方法位于 tab#1 的类内部（它对 tab#2 的导航控制器一无所知）时，我该怎么做呢？
希望这是有道理的。预先感谢您的任何帮助！
好吧，我终于开始工作了。建议的解决方案给了我一个很好的起点。这是最终对我有用的代码：
ARFinderAppDelegate appDelegate = (ARFinderAppDelegate)[[UIApplication sharedApplication] delegate];
[appDelegate.booksNavigationController popViewControllerAnimated:YES]; self.tabBarController.selectedIndex = 1;
我必须通过应用程序委托的实例访问包含 NavigationController 的类。我还必须删除“objectAtIndex:1”，因为我的应用程序会崩溃。
感谢大家的帮助，这对于这个 iPhone 开发新手来说是一次很棒的学习经历！
Here's the setup:
I have a tab bar controller with two tabs. There is a navigation controller on top the second tab, so that I can view details from a table.
On tab #1, I have a button. When this button is pressed, it switches the selected tab over to tab #2.
My problem is this: Let's say I go to tab #2, then I select a line from my table to view the detailed information. Then, instead of hitting the "back" button to return to the base view, I select tab#1. Then I press my button. Tab#2 loads, but it is still showing the detailed view, instead of the table view that I want.
I know how to programmatically press the button.
[self.navigationController popViewControllerAnimated:YES];
But how would I do that when the button pressed method is inside the class for tab#1, which knows nothing of tab#2's navigation controller?
Hope that makes sense. Thanks in advance for any help!
Okay, I finally got it to work. The solution that was suggested gave me a good jumping off point. Here is the code that finally worked for me:
ARFinderAppDelegate appDelegate = (ARFinderAppDelegate)[[UIApplication sharedApplication] delegate];
[appDelegate.booksNavigationController popViewControllerAnimated:YES];
self.tabBarController.selectedIndex = 1;
I had to access the class that contained the NavigationController through an instance of my application delegate. I also had to remove the "objectAtIndex:1" because my application would crash.
Thanks for all the help, this has been a great learning experience for this iPhone development newbie!
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使用你的委托单例。
use your delegate singleton.