點按即可在Swift中重試連接互聯網

Question

我是Swift的初學者，我正想提醒用戶重試連接互聯網。 我正在使用ashleymills的可達性。 我對要放在警報處理程序上的內容感到困惑，因為這不起作用：

func alertConnect() -> UIViewController{
let reach = Reachability()
let alert = UIAlertController(title: "No Internet", message: "Tap to retry connect internet", preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "Retry", style: .default, handler: {
    action in
    do {
        try reach?.startNotifier()
    } catch {
        print("Unable to start notifier")
    }
}))
alert.addAction(UIAlertAction(title: Constants.cancel, style: .cancel))
return alert
}

這是我的Reachability.class：

class ConnectionManager: NSObject {

var reachability: Reachability!

static let sharedInstance: ConnectionManager = { return ConnectionManager() }()


override init() {
    super.init()

    reachability = Reachability()!

    NotificationCenter.default.addObserver(
        self,
        selector: #selector(networkStatusChanged(_:)),
        name: .reachabilityChanged,
        object: reachability
    )

    do {
        try reachability.startNotifier()
    } catch {
        print("Unable to start notifier")
    }
}

@objc func networkStatusChanged(_ notification: Notification) {
    // Do something globally here!
    do {
        try reachability.startNotifier()
    } catch {
        print("Unable to start notifier")
    }
}

static func stopNotifier() -> Void {
    do {
        try (ConnectionManager.sharedInstance.reachability).startNotifier()
    } catch {
        print("Error stopping notifier")
    }
}

static func isReachable(completed: @escaping (ConnectionManager) -> Void) {
    if (ConnectionManager.sharedInstance.reachability).connection != .none {
        completed(ConnectionManager.sharedInstance)
    }
}

static func isUnreachable(completed: @escaping (ConnectionManager) -> Void) {
    if (ConnectionManager.sharedInstance.reachability).connection == .none {
        completed(ConnectionManager.sharedInstance)
    }
}

static func isReachableViaWWAN(completed: @escaping (ConnectionManager) -> Void) {
    if (ConnectionManager.sharedInstance.reachability).connection == .cellular {
        completed(ConnectionManager.sharedInstance)
    }
}

static func isReachableViaWiFi(completed: @escaping (ConnectionManager) -> Void) {
    if (ConnectionManager.sharedInstance.reachability).connection == .wifi {
        completed(ConnectionManager.sharedInstance)
    }
}    }

我應該在重試操作處理程序上放什么以使用戶重新連接到互聯網？ 謝謝你的幫助。

Answer 1

Swift 4的工作代碼

import SystemConfiguration

func InternetCheck () -> Bool {

    var zeroAddress = sockaddr_in()
    zeroAddress.sin_len = UInt8(MemoryLayout.size(ofValue: zeroAddress))
    zeroAddress.sin_family = sa_family_t(AF_INET)

    let defaultRouteReachability = withUnsafePointer(to: &zeroAddress) {
            $0.withMemoryRebound(to: sockaddr.self, capacity: 1) {zeroSockAddress in
            SCNetworkReachabilityCreateWithAddress(nil, zeroSockAddress)
        }
    }

    var flags = SCNetworkReachabilityFlags()
    if !SCNetworkReachabilityGetFlags(defaultRouteReachability!, &flags) {
        return false
    }
    let isReachable = flags.contains(.reachable)
    let needsConnection = flags.contains(.connectionRequired)
    return (isReachable && !needsConnection)
}

支票

if InternetCheck() == false {

   let alert = UIAlertView(title:"Uhhhh :(",message: "No internet connection.",delegate: nil ,cancelButtonTitle: "Ok")
   alert.show()
   return

}
// Internet Connection Available

Answer 2

我找到了解決問題的辦法。 由於可達性檢查應用程序是否可以訪問以及網絡狀態是否發生更改，因此我在重試處理程序上執行的操作是在視圖控制器上聲明該函數，該函數在檢查網絡連接時再次調用API。