MapView委托返回nil

Question

我正在做一个应用程序，我在一个ViewController中输入一个地址，该地址转到另一个ViewController中的MapView并添加注释。 但是，当我在返回mapview时添加地址时，应用崩溃了，并显示了我的mapview.delegate为零。 这是我输入地址的代码：

 @IBAction func createButtonPressed(_sender: Any) {

            guard let address = addresTxtFd.text else { return }
            guard let date = dateTxtFd.text else { return }
            let geocoder = CLGeocoder()
            geocoder.geocodeAddressString((address)) { (placemarks, error) in
                if error == nil {
                    if let placemark = placemarks?[0] {
                        let location = placemark.location!
                        let latitude = location.coordinate.latitude
                        let longitude = location.coordinate.longitude
                        self.locatinService.setLocation(address: address, date: date, latidude: latitude, longitude: longitude, completion: { (success) in
                            if success {
                                let map = MapVC()
                                map.modalPresentationStyle = .custom
                                self.present(map, animated: true, completion: nil)
    //                             LocationServices().dropPin()
                            }
                        })
                    }
                }
            }

这是我的地图视图：

class MapVC: UIViewController {

//    Outlets
    @IBOutlet weak var mapView: MKMapView!
    @IBOutlet weak var newGSButton: UIButton!
//    Variables

    var locationManager = CLLocationManager()
    var locationAuthorization = CLLocationManager.authorizationStatus()

    var regionRadius: Double = 1000

    let annotations = MKPointAnnotation()


    override func viewDidLoad() {
        super.viewDidLoad()
        mapView.delegate = self
        locationManager.delegate = self
        configureCurrentLocation()
    }

    @IBAction func centerUserLocation(_ sender: Any) {
       centerUserCurrentLocation()
    }

    @IBAction func newGSButtonPressed(_ sender: Any) {
        if AuthService.instance.isLoggedIn
        {
            let newGs = NewGarageSaleVC()
            newGs.modalPresentationStyle = .custom
            present(newGs, animated: true, completion: nil)
        } else {
            performSegue(withIdentifier: TO_LOGIN, sender: nil)
        }
    }

}

这是错误：

  

线程1：致命错误：展开包装时意外发现nil   可选值

谢谢。