xcode - (void)applicationDidEnterBackground:(UIApplication *)application
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- (void)applicationDidEnterBackground:(UIApplication *)application
提问by SajjadZare
Can i use below method somewhere other than AppDelegate ?if yes how?
我可以在 AppDelegate 以外的其他地方使用下面的方法吗？如果是，如何？
- (void)applicationDidEnterBackground:(UIApplication *)application
回答by Ole Begemann
No, But you can have other objects register for the UIApplicationDidEnterBackgroundNotificationnotification. These objects will then be notified at the same time applicationDidEnterBackground:is called.
不，但是您可以让其他对象注册UIApplicationDidEnterBackgroundNotification通知。然后这些对象会在applicationDidEnterBackground:被调用的同时得到通知。
回答by Jacob Relkin
This is a method of the UIApplicationDelegateprotocol, and can only be implemented by classes that conform to it.
这是UIApplicationDelegate协议的一个方法，只能由符合它的类来实现。
You can set up a notification to other objects in your app from your app delegate by using the NSNotificationCenterobject:
您可以使用以下NSNotificationCenter对象从您的应用程序委托设置对应用程序中其他对象的通知：
- (void)applicationDidEnterBackground:(UIApplication *)application {
[[NSNotificationCenter defaultCenter] postNotificationName:@"didEnterBackground" object:self];
}
There is also the UIApplicationDidEnterBackgroundNotificationnotification that you can listen for instead of doing the above.
还有一个UIApplicationDidEnterBackgroundNotification，你可以听的，而不是做上述通知。
Register the objects that you want to listen for the notification like this:
像这样注册要监听通知的对象：
[[NSNotificationCenter defaultCenter] addObserver:someObject selector:@selector(someMethod:) name:@"UIApplicationDidEnterBackgroundNotification" object:nil];
