ios - 如何在 swift 的单例中使用此代码？

Question

我有我在这里找到的这段代码。现在我想知道如何在单例中使用它。我的理解是，如果我在单例中使用此代码，如果网络状态发生变化，我会注意到。

 func startNetworkReachabilityObserver() {
    let reachabilityManager = Alamofire.NetworkReachabilityManager(host: "www.google.com")
    reachabilityManager?.listener = { status in

        switch status {

        case .NotReachable:
            print("The network is not reachable")

        case .Unknown :
            print("It is unknown whether the network is reachable")

        case .Reachable(.EthernetOrWiFi):
            print("The network is reachable over the WiFi connection")

        case .Reachable(.WWAN):
            print("The network is reachable over the WWAN connection")

        }
    }

    // start listening
    reachabilityManager?.startListening()
}

Answer 1

只要您保留对 reachabilityManager 的引用，我就可以使用单例

class NetworkStatus {
static let sharedInstance = NetworkStatus()

private init() {}

let reachabilityManager = Alamofire.NetworkReachabilityManager(host: "www.apple.com")

func startNetworkReachabilityObserver() {
    reachabilityManager?.listener = { status in

        switch status {

        case .notReachable:
            print("The network is not reachable")

        case .unknown :
            print("It is unknown whether the network is reachable")

        case .reachable(.ethernetOrWiFi):
            print("The network is reachable over the WiFi connection")

        case .reachable(.wwan):
            print("The network is reachable over the WWAN connection")

        }
    }
    reachabilityManager?.startListening()
}

所以你可以这样使用它:

let networkStatus = NetworkStatus.sharedInstance

override func awakeFromNib() {
    super.awakeFromNib()
    networkStatus.startNetworkReachabilityObserver()
}

如果您的网络状态发生任何变化，您将收到通知。