iOS 判断VPN是否连接

#### 1.使用NEVPNManager框架检查VPN连接状态：

```

import NetworkExtension

let manager = NEVPNManager.shared()

switch manager.connection.status {

case .connected:

    print("VPN is connected")

case .disconnected:

    print("VPN is disconnected")

case .connecting:

    print("VPN is connecting")

case .disconnecting:

    print("VPN is disconnecting")

case .invalid:

    print("VPN is invalid")

@unknown default:

    print("Unknown VPN status")

}

```

#### 2.使用SCNetworkReachability框架检查VPN连接状态：

```

import SystemConfiguration

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 = SCNetworkReachabilityFlags()

if SCNetworkReachabilityGetFlags(defaultRouteReachability!, &flags) {

    if flags.contains(.reachable) && !flags.contains(.isWWAN) {

        if flags.contains(.connectionRequired) || flags.contains(.transientConnection) {

            // VPN is connecting or disconnecting

        } else if flags.contains(.connectionOnDemand) || flags.contains(.connectionOnTraffic) || flags.contains(.interventionRequired) {

            // VPN is connected

        } else {

            // VPN is disconnected

        }

    } else {

        // No internet connection

    }

}

```

请注意，这两种方法都需要在iOS应用程序中使用，并且需要在应用程序中设置网络权限。