在xcode中反向地理编码

import CoreLocation

class ViewController: UIViewController, CLLocationManagerDelegate {

    let locationManager = CLLocationManager()

    override func viewDidLoad() {
        super.viewDidLoad()

        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.requestWhenInUseAuthorization()
        locationManager.startUpdatingLocation()
    }

    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        if let location = locations.last {
            CLGeocoder().reverseGeocodeLocation(location) { (placemarks, error) in
                if let placemark = placemarks?.first {
                    let address = "\(placemark.subThoroughfare ?? "") \(placemark.thoroughfare ?? "")\n\(placemark.locality ?? "")\n\(placemark.administrativeArea ?? "")\n\(placemark.postalCode ?? "")\n\(placemark.country ?? "")"
                    print(address)
                }
            }
        }
    }

    func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
        print("Error: \(error.localizedDescription)")
    }

}