ios - Swift iOS-有wifi连接但没有互联网连接怎么办？

Question

我在我的 iOS 应用程序中使用 Alamofire。我在 viewWillAppear 和带有 NSNotifications 的 AppDelegate 中使用 bool 值来检查是否有互联网连接。如果没有 wifi 连接，则会出现一个弹出窗口通知用户。如果有 wifi 连接，弹出窗口消失，一切正常。只要 wifi 明显无法正常工作，我就没有遇到任何问题。

我在一次聚会上有人向我解释说它的工作方式是寻找 wifi 连接而不是互联网连接。例如，如果我有一个 wifi 路由器并且它已插入但路由器未连接到互联网，Alamofire 会将此视为成功连接，因为它实际上正在连接到 wifi，尽管它不知道 wifi 无法连接上网。

我只是处于连接到开放网络的情况，我的应用程序最初的响应就像我实际上连接到互联网一样(没有弹出窗口)，但我无法连接到任何东西。无线网络信号是满的。在终端中，我运行了一个 ping 命令，结果发现连接已断开。我的应用程序无法区分。

如何在这种情况下显示弹出窗口？

还有什么是 .case unknown 的？

Alamofire.Swift:

import Foundation
import Alamofire

open class NetworkManager {

    open static var sharedManager: NetworkReachabilityManager = {

        let reachabilityManager = NetworkReachabilityManager()

        reachabilityManager?.listener = { (status) in

            switch status {

            case .notReachable:
                print("The network is not reachable")
                NotificationCenter.default.post(name: NSNotification.Name(rawValue: "unsuccessful"), object: nil)

            case .unknown : //???????
                print("It is unknown wether the network is reachable")
                //I'm not sure whether to put a Notification for successful or unsuccessful???

            case .reachable(.ethernetOrWiFi):
                print("The network is reachable over the WiFi connection")
                NotificationCenter.default.post(name: NSNotification.Name(rawValue: "successful"), object: nil)

            case .reachable(.wwan):
                print("The network is reachable over the WWAN connection")
                NotificationCenter.default.post(name: NSNotification.Name(rawValue: "successful"), object: nil)
            }
        }

        reachabilityManager?.startListening()
        return reachabilityManager!
    }()
}

应用委托(delegate):

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

        NetworkManager.sharedManager.startListening()

一些VC:

override func viewWillAppear() {
        super.viewWillAppear()

        NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(successful), name: "successful", object: nil)

        NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(unsuccessful), name: "unsuccessful", object: nil)

       if NetworkManager.sharedManager.isReachable == true{
            self.successful()
       }else{
            self.unsuccessful()
       }

       if NetworkManager.sharedManager.isReachableOnWWAN == true{ 
            self.successful()
       }else{
            self.unsuccessful()
       }

       if NetworkManager.sharedManager.isReachableOnEthernetOrWiFi == true{ 
            self.successful()
       }else{
            self.unsuccessful()
       }
}

func successful(){
    //dismiss pop up
}

func unsuccessful(){
    //show pop up
}

deinit{
    NSNotificationCenter.defaultCenter().removeObserver(self, name: "successful", object: nil)
    NSNotificationCenter.defaultCenter().removeObserver(self, name: "unsuccessful", object: nil)
}
}

Answer 1

您可以使用主机初始化 NetworkReachabilityManager，例如 google 主机，因为默认值为 0.0.0.0

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

当您开始监听可达性管理器对主机执行 ping 操作时。如果网络可用，您可以缓存 SSID 并在 SSID 更改时再次 ping。

对于 case .unknown 最好放一个不成功的通知。

获取 SSID 的示例(在模拟器中不起作用):

func fetchSSIDInfo() ->  String? {  
        if let interfaces = CNCopySupportedInterfaces() {  
            for i in 0..<CFArrayGetCount(interfaces){  
                let interfaceName: UnsafeRawPointer = CFArrayGetValueAtIndex(interfaces, i)  
                let rec = unsafeBitCast(interfaceName, to: AnyObject.self)  
                let unsafeInterfaceData = CNCopyCurrentNetworkInfo("\(rec)" as CFString)  

                if let unsafeInterfaceData = unsafeInterfaceData as? Dictionary<AnyHashable, Any> {  
                    return unsafeInterfaceData["SSID"] as? String  
                }  
            }  
        }  
        return nil  
    }