Retrieving user postal code for use in Swift Project

@IBOutlet var localityTxtField: UITextField!
@IBOutlet var postalCodeTxtField: UITextField!
@IBOutlet var aAreaTxtField: UITextField!
@IBOutlet var countryTxtField: UITextField!

let locationManager = CLLocationManager()

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}

@IBAction func findMyLocation(_ sender: AnyObject) {
    locationManager.delegate = self
    locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
    locationManager.requestWhenInUseAuthorization()
    locationManager.startUpdatingLocation()
}

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    CLGeocoder().reverseGeocodeLocation(manager.location!, completionHandler: {(placemarks, error)->Void in

        if (error != nil) {
            print("Reverse geocoder failed with error" + (error?.localizedDescription)!)
            return
        }

        if (placemarks?.count)! > 0 {
            let pm = placemarks?[0]
            self.displayLocationInfo(pm)
            print (self.displayLocationInfo(pm))
        } else {
            print("Problem with the data received from geocoder")
        }
    })
}

func displayLocationInfo(_ placemark: CLPlacemark?) {
    if let containsPlacemark = placemark {
      //stop updating location to save battery life
        locationManager.stopUpdatingLocation()
        //let locality = (containsPlacemark.locality != nil) ? containsPlacemark.locality : ""
        let postalCode = (containsPlacemark.postalCode != nil) ? containsPlacemark.postalCode : ""
        //let administrativeArea = (containsPlacemark.administrativeArea != nil) ? containsPlacemark.administrativeArea : ""
       // let country = (containsPlacemark.country != nil) ? containsPlacemark.country : ""

        /*
        localityTxtField.text = locality
        postalCodeTxtField.text = postalCode
        aAreaTxtField.text = administrativeArea
        countryTxtField.text = country

}


func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
      print("Error while updating location " + error.localizedDescription)
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

   // func yup() -> (Int) {
    self.getAddress() { (address) in

        //(address)

       print(address)
        //step 4, finishing the execution
    }

}




func getAddress(handler: @escaping (String) -> ())
{

    self.locationManager.requestAlwaysAuthorization()
    self.locationManager.requestWhenInUseAuthorization()

    if CLLocationManager.locationServicesEnabled() {

    locationManager.delegate = self
    locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
    locationManager.requestWhenInUseAuthorization()
    //locationManager.startUpdatingLocation()
   // let locationManager = CLLocationManager()

    var userLatitude:CLLocationDegrees! //= 0
    var userLongitude:CLLocationDegrees!// = 0

        //if self.locationManager != nil {

            //assign your loaction values here
            userLatitude = locationManager.location?.coordinate.latitude

            userLongitude = locationManager.location?.coordinate.latitude

       // } else {
            //print("locationManager.location is nil")
        //}

    userLatitude = locationManager.location?.coordinate.latitude

    userLongitude = locationManager.location?.coordinate.latitude


    Latitude_Double = Double(userLatitude)
    Longitude_Double = Double(userLongitude)


    var address: String = ""
    let geoCoder = CLGeocoder()
    let location = CLLocation(latitude: Latitude_Double, longitude: Longitude_Double)
    //selectedLat and selectedLon are double values set by the app in a previous process

    geoCoder.reverseGeocodeLocation(location, completionHandler: { (placemarks, error) -> Void in

        // Place details
        var placeMark: CLPlacemark?
        placeMark = placemarks?[0]

        // Address dictionary
        //print(placeMark.addressDictionary ?? "")
      /*
        // Location name
        if let locationName = placeMark?.addressDictionary?["Name"] as? String {
            address += locationName + ", "
        }

        // Street address
        if let street = placeMark?.addressDictionary?["Thoroughfare"] as? String {
            address += street + ", "
        }
        // City
        if let city = placeMark?.addressDictionary?["City"] as? String {
            address += city + ", "
        }
       */

        // Zip code
        if let zip = placeMark?.addressDictionary?["ZIP"] as? String {
            address += zip + ", "
        }

        /*

        // Country
        if let country = placeMark?.addressDictionary?["Country"] as? String {
            address += country
        }
       */

        // Passing address back
        handler(address)
    })
    }
}