如何在ios swift 4中获得可用的wifi网络

import CoreLocation
import SystemConfiguration.CaptiveNetwork

func getWiFiSSID() -> String? {
    var ssid: String?
    
    if let interfaces = CNCopySupportedInterfaces() as NSArray? {
        for interface in interfaces {
            if let interfaceInfo = CNCopyCurrentNetworkInfo(interface as! CFString) as NSDictionary? {
                ssid = interfaceInfo[kCNNetworkInfoKeySSID as String] as? String
                break
            }
        }
    }
    
    return ssid
}

if let wifiSSID = getWiFiSSID() {
    print("当前连接的WiFi网络名称：\(wifiSSID)")
} else {
    print("当前未连接到WiFi网络")
}