ios - [[NSNotificationCenter defaultCenter] addObserver:选择器:@selector(mymethod)名称:对象:]；在iOS 9中不再被调用

Question

在IOS 9之前，我的ViewController类包括NSNotificationCenter观察者，并且@selector()方法被正确调用(如下所示的代码)。
但是，从iOS 9开始，不再调用这些方法。有人有同样的问题吗？我需要知道是否对此有解决方案，或者需要从AppDelegate类向我的viewController进行Delegate调用。先感谢您。

请注意，我在viewWillAppear中有那些，在viewWillDisappear中有removeObserver。

我看过苹果文件https://developer.apple.com/library/prerelease/mac/releasenotes/Foundation/RN-Foundation/index.html#//apple_ref/doc/uid/TP30000742
它指出我们不再需要为弱链接通知删除观察者，因此我从viewWillDisappear中删除了“removeObserver”。

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

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

 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationBecameActive) name:UIApplicationDidBecomeActiveNotification object:nil];

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

Answer 1

有些报告说延迟可能会有所帮助。可能是这样的:dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(applicationDidEnterBackground) name:UIApplicationDidEnterBackgroundNotification object:nil];
});