Check if iOS app is connected to VPN

is_connected_to_vpn.swift

func isConnectedToVpn() -> Bool {
    let host = "www.example.com"
    guard let reachability = SCNetworkReachabilityCreateWithName(nil, host) else {
        return false
    }
    var flags = SCNetworkReachabilityFlags()
    if SCNetworkReachabilityGetFlags(reachability, &flags) == false {
        return false
    }
    let isOnline = flags.contains(.reachable) && !flags.contains(.connectionRequired)
    if !isOnline {
        return false
    }
    let isMobileNetwork = flags.contains(.isWWAN)
    let isTransientConnection = flags.contains(.transientConnection)
    if isMobileNetwork {
        if let settings = CFNetworkCopySystemProxySettings()?.takeRetainedValue() as? Dictionary<String, Any>,
            let scopes = settings["__SCOPED__"] as? [String:Any] {
            for (key, _) in scopes {
                if key.contains("tap") || key.contains("tun") || key.contains("ppp") {
                    return true
                }
            }
        }
        return false
    } else {
        return isTransientConnection
    }
}