点击以在 Swift 后重试连接互联网

Question

我是 Swift 的初学者，我正在尝试提醒用户重试连接到互联网。我正在使用 ashleymills 的 Reachability。我对在我的警报处理程序上放什么感到困惑，因为这不起作用：

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
}

这是我的 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)
    }
}    }

我应该在我的重试操作处理程序中放置什么才能让用户重新连接到互联网？感谢您的帮助。

Answer 1

Swift 4

的工作代码

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) {
            [=10=].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)
}

待检查

if InternetCheck() == false {

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

}
// Internet Connection Available

Answer 2

我找到了解决问题的办法。由于 Reachability 检查应用程序是否可访问以及网络状态是否发生变化，我在 Retry 处理程序上所做的是在我的视图控制器上声明该函数，该函数在检查网络连接时再次调用 API 。

点击以在 Swift 后重试连接互联网

Tap to retry connect internet in Swift

uialertview

ios

swift

uialertcontroller

reachability-swift