当应用程序从iPhone后台出现时，调用什么方法? | 当应用程序从iPhone后台出现时

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问题描述

我知道，当iphone应用程序进入后台时，这些方法称为:

I know that when iphone application goes to background, these methods are called:

- (void)applicationDidEnterBackground:(UIApplication *)application
- (void)applicationWillResignActive:(UIApplication *)application

应用程序从后台出现时会调用什么方法?

what method(s) are called when application appears from background?

ViewController中有没有被调用的方法?

are there any methods in ViewController which are called?

谢谢

推荐答案

以及发送给应用程序委托的 applicationDidBecomeActive:和 applicationWillEnterForeground:消息，操作系统还将发送相应的 UIApplicationDidBecomeActiveNotification 和 UIApplicationWillEnterForegroundNotification 通知.

Along with the applicationDidBecomeActive: and applicationWillEnterForeground: messages sent to the application delegate, the OS will also send corresponding UIApplicationDidBecomeActiveNotification and UIApplicationWillEnterForegroundNotification notifications.

您可以让您的视图控制器侦听这些通知:

You can have your view controller listen to these notifications:

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(appWillEnterForegroundNotification:)
                                             name:UIApplicationWillEnterForegroundNotification
                                           object:nil];

在破坏视图控制器之前，请不要忘了以观察者身份离开自己.

Don't forget to remove yourself as an observer before your view controller gets destroyed.

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