Question

我正在使用ashleymills的可达性：https://github.com/ashleymills/Reachability.swift/releases

在Xcode 7中，我写了一个函数来显示可达性状态的警报。

但是，警报从不显示。

这是我的代码：

let reachability = Reachability.reachabilityForInternetConnection()
reachability!.whenReachable = { reachability in
    if reachability.isReachableViaWiFi() {
        let alertController = UIAlertController(title: "Alert", message: "Reachable via WiFi", preferredStyle: .Alert)
        let defaultAction = UIAlertAction(title: "OK", style: .Default, handler: nil)

        alertController.addAction(defaultAction)

        self.presentViewController(alertController, animated: true, completion: nil)
    }
    else {
        let alertController = UIAlertController(title: "Alert", message: "Reachable via Cellular", preferredStyle: .Alert)
        let defaultAction = UIAlertAction(title: "OK", style: .Default, handler: nil)

        alertController.addAction(defaultAction)

        self.presentViewController(alertController, animated: true, completion: nil)
    }
}

reachability!.whenUnreachable = { reachability in
    let alertController = UIAlertController(title: "Alert", message: "Please connect to internet", preferredStyle: .Alert)
    let defaultAction = UIAlertAction(title: "OK", style: .Default, handler: nil)

    alertController.addAction(defaultAction)

    self.presentViewController(alertController, animated: true, completion: nil)
}

reachability!.startNotifier()

Answer 1

请用这个替换你的代码并且它应该有效，在swift 1.2之后Reachability可能有一个错误，所以在这里我只是检查它是否可以访问并且我认为它足够了。

在我看来，你不必检查它是无线网络还是蜂窝网络，警报背后的原因是没有显示，因为它没有进入阻止显示警报：

let useClosures = false

class ViewController: UIViewController {

    let reachability = Reachability.reachabilityForInternetConnection()

    override func viewDidLoad() {
        super.viewDidLoad()

        if (useClosures) {
            reachability?.whenReachable = { reachability in
                print("Reachable")
            }
            reachability?.whenUnreachable = { reachability in
                print("Unreachable")
            }
        } else {
            NSNotificationCenter.defaultCenter().addObserver(self, selector: "reachabilityChanged:", name: ReachabilityChangedNotification, object: reachability)
        }

        reachability?.startNotifier()

        // Initial reachability check when the app starts
        if let reachability = reachability {
              dispatch_async(dispatch_get_main_queue()) {
            if reachability.isReachable() {
                let alertController = UIAlertController(title: "Alert", message: "Reachable", preferredStyle: .Alert)
                let defaultAction = UIAlertAction(title: "OK", style: .Default, handler: nil)

                alertController.addAction(defaultAction)

                self.presentViewController(alertController, animated: true, completion: nil)
            } else {
                let alertController = UIAlertController(title: "Alert", message: "Please connect to internet", preferredStyle: .Alert)
                let defaultAction = UIAlertAction(title: "OK", style: .Default, handler: nil)

                alertController.addAction(defaultAction)

                self.presentViewController(alertController, animated: true, completion: nil)
            }
            }
        }
    }

    deinit {

        reachability?.stopNotifier()

        if (!useClosures) {
            NSNotificationCenter.defaultCenter().removeObserver(self, name: ReachabilityChangedNotification, object: nil)
        }
    }


    func reachabilityChanged(note: NSNotification) {
        let reachability = note.object as! Reachability
        // Initial reachability check while surfing in the app
        if reachability.isReachable() {
            let alertController = UIAlertController(title: "Alert", message: "Reachable", preferredStyle: .Alert)
            let defaultAction = UIAlertAction(title: "OK", style: .Default, handler: nil)

            alertController.addAction(defaultAction)

            self.presentViewController(alertController, animated: true, completion: nil)

        } else {
            let alertController = UIAlertController(title: "Alert", message: "Please connect to internet", preferredStyle: .Alert)
            let defaultAction = UIAlertAction(title: "OK", style: .Default, handler: nil)

            alertController.addAction(defaultAction)

            self.presentViewController(alertController, animated: true, completion: nil)
        }
    }
}

注意：您说您的应用中有webView，请记住，必须在可以访问时刷新或更新。

显示可达性状态的提醒

1 个答案: