如何从viewController访问applicationDidEnterBackground [英] How to access applicationDidEnterBackground from viewController

问题描述

如何从viewController调用AppDelegate中的applicationDidEnterBackground?

我想在应用程序的后台运行一个功能，而无需按主页按钮.

I want to run a function in the background of the app without pressing home button.

推荐答案

您不应从任何地方调用该函数.该应用程序可让您知道应用程序何时进入后台.

You are not supposed to call that function from anywhere. It is there to let you know when the app enters the background.

您是否只想知道应用何时进入后台?如果是这样，那么您可以创建一个通知来帮助您:

Do you simply want to know when the app enters the background? If so, then you can create a notification to help you with that:

[[NSNotificationCenter defaultCenter] addObserver: self
                                         selector: @selector(handleEnteredBackground:) 
                                             name: UIApplicationDidEnterBackgroundNotification
                                           object: nil];

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