Launching Map App with Navigation after pressing a button - ios

Question

I am trying to open automatically the Maps App with Navigation, when pressing a Button.
My ViewController look like this:
import UIKit
import MapKit
class WhereViewController: UIViewController {
#IBOutlet weak var MapView: MKMapView!
#IBAction func navigateButtonHandler(_ sender: UIButton) {
func mapView(_ mapView: MKMapView, annotationView view: MKAnnotationView,
calloutAccessoryControlTapped control: UIControl) {
let location = view.annotation as! Artwork
let launchOptions = [MKLaunchOptionsDirectionsModeKey: MKLaunchOptionsDirectionsModeDriving]
location.mapItem().openInMaps(launchOptions: launchOptions)
}
}
override func viewDidLoad() {
super.viewDidLoad()
// set initial location in Honolulu
let initialLocation = CLLocation(latitude: 21.282778, longitude: -157.829444)
centerMapOnLocation(location: initialLocation)
//MapView.delegate = self
// show artwork on map
let artwork = Artwork(title: "King David Kalakaua",
locationName: "Waikiki Gateway Park",
discipline: "Sculpture",
coordinate: CLLocationCoordinate2D(latitude: 21.283921, longitude: -157.831661))
MapView.addAnnotation(artwork)
}
let regionRadius: CLLocationDistance = 1000
func centerMapOnLocation(location: CLLocation) {
let coordinateRegion = MKCoordinateRegionMakeWithDistance(location.coordinate,
regionRadius, regionRadius)
MapView.setRegion(coordinateRegion, animated: true)
}
}
And my Artwork Swift File looks like this:
import Foundation
import MapKit
import Contacts
class Artwork: NSObject, MKAnnotation {
let title: String?
let locationName: String
let discipline: String
let coordinate: CLLocationCoordinate2D
init(title: String, locationName: String, discipline: String, coordinate: CLLocationCoordinate2D) {
self.title = title
self.locationName = locationName
self.discipline = discipline
self.coordinate = coordinate
super.init()
}
var subtitle: String? {
return locationName
}
// Annotation right callout accessory opens this mapItem in Maps app
func mapItem() -> MKMapItem {
let addressDict = [CNPostalAddressStreetKey: subtitle!]
let placemark = MKPlacemark(coordinate: coordinate, addressDictionary: addressDict)
let mapItem = MKMapItem(placemark: placemark)
mapItem.name = title
return mapItem
}
}
When i press the button, is doesn't work. Where is my mistake?
Hope you can help me.
I follow these Tutorial for the MapKit:
https://www.raywenderlich.com/548-mapkit-tutorial-getting-started
Thanks for your answer