ios - ReachabilitySwift 有什么问题？

Question

在我的 viewDidLoad() 函数中，我调用了这个方法:

//MARK: Reachability
func startReachability(){
    //declare this property where it won't go out of scope relative to your listener
    do{
        let reachability = try Reachability.reachabilityForInternetConnection()

        reachability.whenReachable = { reachability in
            // this is called on a background thread, but UI updates must
            // be on the main thread, like this:
            dispatch_async(dispatch_get_main_queue()) {
                if reachability.isReachableViaWiFi() {
                    print("Reachable via WiFi")
                } else {
                    print("Reachable via Cellular")
                }
            }
        }
        reachability.whenUnreachable = { reachability in
            // this is called on a background thread, but UI updates must
            // be on the main thread, like this:
            dispatch_async(dispatch_get_main_queue()) {
                print("Not reachable")
            }
        }

        try reachability.startNotifier()

    } catch {
        print("Unable to start notifier")
    }
}

但它不起作用。它只调用一次 whenReachable() 和 whenUnreachable() 并且当我关闭和打开 Wi-Fi 时它什么也不做。

Answer 1

我需要对 Reachability 实例的强烈引用!所以我应该在类里面声明它。