在应用程序委托中弹出到根视图控制器 [英] Pop to root view controller in app delegate

问题描述

我有一个可以登录的应用程序，如果将其发送到后台超过10分钟后又启动了该应用程序，我会弹出一个不错的会话已过期"警报，并将其发送到根视图控制器(登录页面) .

I have an app that someone logs into and if they launch it after sending it to the background for more than 10 minutes I pop up a nice little "session expired" alert and send them to the root view controller (login page).

一切正常，但我不知道如何从应用程序委托的applicationWillEnterForeground:方法弹出到导航控制器堆栈中的根视图控制器.

Everything works great but I don't know how to pop to the root view controller in my navigation controller stack from the app delegate's applicationWillEnterForeground: method.

我尝试将navigationController保存到appDelegate变量中，但是我想知道应用程序是否在后台运行了好几天，是否iOS开始释放某些变量，因为当时我在此方法中遇到错误.

I tried saving off the navigationController onto an appDelegate variable but I wonder if the app is in the background for several days, if iOS starts freeing some variables, as I get an error in this method at that time.

有什么想法吗?

推荐答案

如果导航控制器是应用程序的根视图控制器，则可以像以下方式获得它:

If the navigation controller is your application's root view controller, then you can get it like:

UINavigationController *myNavCon = (UINavigationController*)self.window.rootViewController;

其中self在应用程序委托中

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