检测应用程序何时进入我的视图的背景时，最好的方法是什么？ [英] What's the best way to detect when the app is entering the background for my view?

问题描述

我有一个视图控制器，它使用 NSTimer 来执行一些代码。

I have a view controller that uses an NSTimer to execute some code.

最好的方法是什么检测应用程序何时进入后台，以便暂停计时器？

What's the best way to detect when the app is going to the background so I can pause the timer?

推荐答案

您可以让任何课程感兴趣应用程序进入后台接收通知。这是将这些类与AppDelegate耦合的好方法。

You can have any class interested in when the app goes into the background receive notifications. This is a good alternative to coupling these classes with the AppDelegate.

初始化所述类时：

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(appWillResignActive:) name:UIApplicationWillResignActiveNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(appWillTerminate:) name:UIApplicationWillTerminateNotification object:nil];

回应通知

-(void)appWillResignActive:(NSNotification*)note
{

}
-(void)appWillTerminate:(NSNotification*)note
{
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationWillResignActiveNotification object:nil];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationWillTerminateNotification object:nil];

}

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