Question

在我的viewDidLoad()函数中，我称这种方法为：

//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whenReachable()和whenUnreachable()一次，当我关闭并打开Wi-Fi时，它什么都不做。

Answer 1

我需要强烈引用Reachability实例！所以我应该在课堂上宣布它。

Answer 2

只有在您直接调用此方法时，它才会验证您的网络。如果您希望收到有关网络可更改性更改的通知，则应使用可更新性通知。

观察员通知。

//declare this property where it won't go out of scope relative to your listener
let reachability = Reachability()!

//declare this inside of viewWillAppear

NSNotificationCenter.defaultCenter().addObserver(self, selector: "reachabilityChanged:",name: ReachabilityChangedNotification,object: reachability)
do{
  try reachability.startNotifier()
}catch{
  print("could not start reachability notifier")
}

处理更改：

func reachabilityChanged(note: NSNotification) {

  let reachability = note.object as! Reachability

  if reachability.isReachable() {
    if reachability.isReachableViaWiFi() {
      print("Reachable via WiFi")
    } else {
      print("Reachable via Cellular")
    }
  } else {
    print("Network not reachable")
  }
}

退订：

reachability.stopNotifier()
NSNotificationCenter.defaultCenter().removeObserver(self,
                                                    name: ReachabilityChangedNotification,
                                                    object: reachability)

Answer 3

在Swift 4中，当可执行的Clouser无法执行时，我遇到了问题。我发现所有通知都应在主队列中传递。

使用下面的代码解决

//在文件顶部声明此属性，因此范围将保留。

ConfigurationAdmin

ReachabilitySwift有什么问题？

3 个答案: