如何在iOS 4中注册UIApplicationWillTerminateNotification

Question

这是一个真正的新手：

如何在多个对象中注册UIApplicationWillTerminateNotification？

谢谢!

Answer 1

在iOS4中，支持后台执行的应用程序通常不会调用applicationWillTerminate。这可能就是你遇到问题的原因。

如果禁用了该功能，则可以注册对象以侦听UIApplicationWillTerminateNotification通知，和/或覆盖应用程序委托-applicationWillTerminate:方法并将代码放在其中：

//set up this class as an observer of UIApplicationWillTerminateNotification
//so we can intervene when the app is about to exit.
[[NSNotificationCenter defaultCenter]
                         addObserver:self
                            selector:@selector(applicationWillTerminate:)
                                name:UIApplicationWillTerminateNotification
                              object:[UIApplication sharedApplication]];