检查Swift中的网络状态,不会调用observer

Question

我有进口Reachability.h的.m文件,就像写在这里为我的雨燕的项目,但开始后观察者/事件处理程序将不会被调用,为什么呢？

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool {

    NSNotificationCenter.defaultCenter().addObserver(self, selector: "reachabilityChanged:", name: kReachabilityChangedNotification, object: nil)

    let hostReachability = Reachability(hostName: "www.apple.com");
    hostReachability.startNotifier();

    return true
}

func reachabilityChanged(note: NSNotification) { // <- DOES NOT GET CALLED

    let reachability: Reachability = note.object as Reachability;

    if(reachability.currentReachabilityStatus() != .NotReachable) {

    }
}

Answer 1

Reachability返回的对象是一个自动释放的对象,因此它已取消分配,因此通知不会触发.您可以通过保持对它的强引用来解决问题.

创建一个属性来保存Reachability对象

var reachability:Reachability?

 func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool {
        // Override point for customization after application launch.

        NSNotificationCenter.defaultCenter().addObserver(self, selector: "reachabilityChanged:", name:kReachabilityChangedNotification, object: nil)

        reachability = Reachability(hostName: "www.apple.com");
        reachability?.startNotifier();

        return true
    }

这将解决您的问题.

观察者的名称从ReachabilityChangedNotification更改为kReachabilityChangedNotification.注意"k"