如何在iOS中以编程方式为连接的WiFi更改/添加DNS服务器？

import CoreFoundation

func changeDNSServer(forSSID ssid: String, withDNS dns: String) {
    let interfaces = CNCopySupportedInterfaces()
    if interfaces != nil {
        let interfacesArray = CFBridgingRetain(interfaces) as! [String]
        for interface in interfacesArray {
            let networkInfo = CNCopyCurrentNetworkInfo(interface as CFString)
            if networkInfo != nil {
                let networkInfoDict = CFBridgingRetain(networkInfo) as! [String: Any]
                if let currentSSID = networkInfoDict[kCNNetworkInfoKeySSID as String] as? String, currentSSID == ssid {
                    let dnsSettings = [kCNDNSServiceIdentifier: kCNDNSServiceTypeAutomatic, kCNDNSServiceAddresses: [dns]]
                    let dnsConfig = [kCNSupportedSSIDs: [ssid], kCNDNSServiceConfiguration: dnsSettings] as [String : Any]
                    let setDNS = CNSetSupportedSSIDs(dnsConfig as CFDictionary)
                    if setDNS {
                        print("DNS server changed successfully.")
                    } else {
                        print("Failed to change DNS server.")
                    }
                    return
                }
            }
        }
    }
    print("WiFi network not found.")
}

let ssid = "YourWiFiSSID"
let dns = "YourDNSServerAddress"
changeDNSServer(forSSID: ssid, withDNS: dns)