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嗨我想捕获每当用户在我的应用程序中获得网络连接时,我已经添加了苹果Reachability类,下面是我在appDelegate类didFinishLaunchingWithOptions方法中使用的片段,

Reachability* reachability = [Reachability reachabilityForInternetConnection];
        [reachability startNotifier];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:) name:kReachabilityChangedNotification object:nil];

和我的reachabilityChanged选择器方法如下

- (void)reachabilityChanged:(NSNotification*)notification
{
    Reachability* reachability = notification.object;
    if(reachability.currentReachabilityStatus == NotReachable)
        NSLog(@"Internet off");
    else
        NSLog(@"Internet on");
}

但在这里,当我关闭飞机模式并在手机中获得网络连接时,我没有收到任何通知.

我错过了什么吗？