网络连接只有在更改时才会出现

Question

我正在使用Alamofire NetworkReachabilityManager来管理我的连接，如下所示。

    let reachabilityManager = NetworkReachabilityManager()
   reachabilityManager?.listener = { [weak self] status in
            switch status {
            case .notReachable:
                self?.connectionType = .notReachable
                break
            case .unknown:
                self?.connectionType = .notReachable
                break
            case .reachable(.ethernetOrWiFi):
                self?.connectionType = .wifi
                break
            case .reachable(.wwan):
                self?.connectionType = .cellular

                break
            }

public enum ReachabilityStatus {
    case unknown
    case notReachable
    case wifi
    case cellular
}

当我启动应用程序本身时，我收到此回调，但我不希望这个回调只有在网络连接发生变化时才需要回调。

我怎么解决这个问题？

Answer 1

如何创建一个变量来存储先前的状态，并在第一次调用时检查变量是否为nil。 之后，您可以随时检查状态是否已更改。

let reachabilityManager = NetworkReachabilityManager()
var previousStatus: ReachabilityStatus? = nil

reachabilityManager?.listener = { [weak self] status in

    if let p = self.previousStatus, p == status {
        return // status hasn't changed
    } else {
        // status is nil
        self.previousStatus = status
        return 
    }

    switch status {
    case .notReachable:
        self?.connectionType = .notReachable
        break
    case .unknown:
        self?.connectionType = .notReachable
        break
    case .reachable(.ethernetOrWiFi):
        self?.connectionType = .wifi
        break
    case .reachable(.wwan):
        self?.connectionType = .cellular

        break
}

Answer 2

您可以在延迟一段时间后添加监听器。 因此，当应用程序启动时实例化NetworkReachabilityManager时，侦听器应为nil

    let reachabilityManager = NetworkReachabilityManager()
    var previousStatus: ReachabilityStatus? = nil

    DispatchQueue.main.asyncAfter(deadline: .now() + 10.0, execute: {
    reachabilityManager?.listener = { [weak self] status in

    if let p = self.previousStatus, p == status {
        return // status hasn't changed
    } else {
        // status is nil
        self.previousStatus = status
        return 
    }

    switch status {
    case .notReachable:
        self?.connectionType = .notReachable
        break
    case .unknown:
        self?.connectionType = .notReachable
        break
    case .reachable(.ethernetOrWiFi):
        self?.connectionType = .wifi
        break
    case .reachable(.wwan):
        self?.connectionType = .cellular

        break
 }
})

编辑：我已经测试了这段代码。 有用。