Xcode NSNotificationCenter应用程序IDBecMeactivateNotification不工作iOS 9

我正在尝试调用一个函数，当应用程序com通过ApplicationIDBecMeactiveNotification返回前台时。我在iOS 8和iOS 7中都有它，而且运行良好。但不是在iOS 9中？当你第一次打开应用程序时，它会给你打电话

-(void) viewWillAppear:(BOOL)animated {

[[NSNotificationCenter defaultCenter]
 addObserver:self
 selector:@selector(applicationDidBecomeActiveNotification:)
 name:UIApplicationDidBecomeActiveNotification
 object:[UIApplication sharedApplication]]; 

}

- (void)applicationDidBecomeActiveNotification:(NSNotification *)notification {

//stuff

}

---

每个通知中心在启动时都没有调用…

我遇到了同样的问题，对我来说，将addObserver代码移动到awakeFromNib是有效的。另一种解决方案是向addObserver添加延迟，如下例所示：

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationDidBecomeActive) name:UIApplicationDidBecomeActiveNotification object:nil];
});

---

我遇到了同样的问题，对我来说，将addObserver代码移动到awakeFromNib是有效的。另一种解决方案是向addObserver添加延迟，如下例所示：

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationDidBecomeActive) name:UIApplicationDidBecomeActiveNotification object:nil];
});

看

这就是你需要的

NSNotificationCenter.defaultCenter().addObserverForName(UIApplicationDidBecomeActiveNotification, object: nil, queue: nil) { note in
    self.applicationDidBecomeActiveNotification(note)
}

看

这就是你需要的

NSNotificationCenter.defaultCenter().addObserverForName(UIApplicationDidBecomeActiveNotification, object: nil, queue: nil) { note in
    self.applicationDidBecomeActiveNotification(note)
}

---

您可能希望改为在viewDidLoad中注册。另外，尝试在对象：参数中传递nil，而不是

[UIApplication sharedApplication]

。您可能希望改为在viewDidLoad中注册。另外，在object:argument中尝试传递nil而不是

[UIApplication sharedApplication]