import Foundation
import SystemConfiguration.CaptiveNetwork

func getSSID() -> 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
}

import CoreLocation

func updateWiFi() {
    print("SSID: \(currentNetworkInfos?.first?.ssid)")
    ssidLabel.text = getSSID()
}

if #available(iOS 13.0, *) {
    let status = CLLocationManager.authorizationStatus()
    if status == .authorizedWhenInUse {
        updateWiFi()
    } else {
        locationManager.delegate = self
        locationManager.requestWhenInUseAuthorization()
    }
} else {
    updateWiFi()
}

class ViewController: UIViewController, CLLocationManagerDelegate {
    ...
    func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
        if status == .authorizedWhenInUse {
            updateWiFi()
        }
    }
    ...
}