Swift MapKit ne montre pas les directions à épingler

Question

J'ai écrit le code pour laisser tomber une épingle, puis montrer les directions sur un MapKitView et pour une raison quelconque, la broche tombe mais les directions ne seront pas affichées sur la carte. Toute aide est la bienvenue, merci.

import UIKit 
import MapKit 
import CoreLocation 

class ViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate { 

    @IBOutlet weak var MapView: MKMapView! 

    let locationManager = CLLocationManager() 
    var movedToUserLocation = false 

    func clean() { 
     MapView.removeAnnotations(MapView.annotations) 
     MapView.removeOverlays(MapView.overlays) 
    } 

    func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) { 
     switch status { 
     case .denied, .restricted: 
      print("Disable Parental Controles") 
     case .notDetermined: 
      manager.requestWhenInUseAuthorization() 
     default: 
      manager.startUpdatingLocation() 
     } 
    } 

    func mapView(_ mapView: MKMapView, didUpdate userLocation: MKUserLocation) { 
     if !movedToUserLocation { 
      mapView.region.center = mapView.userLocation.coordinate 
      movedToUserLocation = true 
     } 
    } 


    func addDirections(coor: CLLocationCoordinate2D) { 
     let directionsRequest = MKDirectionsRequest() 
     directionsRequest.source = MKMapItem(placemark: MKPlacemark(coordinate: MapView.userLocation.coordinate)) 
     directionsRequest.destination = MKMapItem(placemark: MKPlacemark(coordinate: coor)) 
     directionsRequest.requestsAlternateRoutes = false 
     directionsRequest.transportType = .any 

     let directions = MKDirections(request: directionsRequest) 
     directions.calculate { response, error in 
      if let res = response { 
       if let route = res.routes.first { 
        self.MapView.add(route.polyline) 
        self.MapView.region.center = coor 
       } 
      } 
      else { 
       print(error) 
      } 
     } 
    } 

    @IBAction func B1(_ sender: Any) { 
     let lat = 30.2817 
     let lon = -86.0188 

     self.clean() 

     let coord = CLLocationCoordinate2DMake(CLLocationDegrees(lat), CLLocationDegrees(lon)) 
     let annotationView: MKPinAnnotationView! 
     let annotationPoint = MKPointAnnotation() 

     annotationPoint.coordinate = coord 
     annotationPoint.title = "Pizza By The Sea" 

     annotationView = MKPinAnnotationView(annotation: annotationPoint, reuseIdentifier: "Annotation") 
     MapView.addAnnotation(annotationView.annotation!) 
     addDirections(coor: coord) 
    } 


    @IBAction func B2(_ sender: Any) { 
     let lat = 30.2844 
     let lon = -86.0272 

     self.clean() 

     let coord = CLLocationCoordinate2DMake(CLLocationDegrees(lat), CLLocationDegrees(lon)) 
     let annotationView: MKPinAnnotationView! 
     let annotationPoint = MKPointAnnotation() 

     annotationPoint.coordinate = coord 
     annotationPoint.title = "George's" 

     annotationView = MKPinAnnotationView(annotation: annotationPoint, reuseIdentifier: "Annotation") 
     MapView.addAnnotation(annotationView.annotation!) 
     addDirections(coor: coord) 
    } 

    @IBAction func B3(_ sender: Any) { 
     let lat = 30.2815 
     let lon = -86.0191 

     self.clean() 

     let coord = CLLocationCoordinate2DMake(CLLocationDegrees(lat), CLLocationDegrees(lon)) 
     let annotationView: MKPinAnnotationView! 
     let annotationPoint = MKPointAnnotation() 

     annotationPoint.coordinate = coord 
     annotationPoint.title = "Ticheli's Pizza" 

     annotationView = MKPinAnnotationView(annotation: annotationPoint, reuseIdentifier: "Annotation") 
     MapView.addAnnotation(annotationView.annotation!) 
     addDirections(coor: coord) 
    } 

    @IBAction func B4(_ sender: Any) { 
     let lat = 30.2794074 
     let lon = -86.0816672 

     self.clean() 

     let coord = CLLocationCoordinate2DMake(CLLocationDegrees(lat), CLLocationDegrees(lon)) 
     let annotationView: MKPinAnnotationView! 
     let annotationPoint = MKPointAnnotation() 

     annotationPoint.coordinate = coord 
     annotationPoint.title = "Big Bad Breakfast" 

     annotationView = MKPinAnnotationView(annotation: annotationPoint, reuseIdentifier: "Annotation") 
     MapView.addAnnotation(annotationView.annotation!) 
     addDirections(coor: coord) 
    } 

    @IBAction func B5(_ sender: Any) { 
     let lat = 30.3129063 
     let lon = -86.1119704 

     self.clean() 

     let coord = CLLocationCoordinate2DMake(CLLocationDegrees(lat), CLLocationDegrees(lon)) 
     let annotationView: MKPinAnnotationView! 
     let annotationPoint = MKPointAnnotation() 

     annotationPoint.coordinate = coord 
     annotationPoint.title = "Cafe Thirty-A" 

     annotationView = MKPinAnnotationView(annotation: annotationPoint, reuseIdentifier: "Annotation") 
     MapView.addAnnotation(annotationView.annotation!) 
     addDirections(coor: coord) 
    } 

    func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKPolylineRenderer { 
     let renderer = MKPolylineRenderer(overlay: overlay as! MKPolyline) 

     renderer.strokeColor = .yellow 
     renderer.lineWidth = 5.0 

     return renderer 
    } 

    @objc func dropAnnotation(gestureRecogniser: UIGestureRecognizer) { 
     if gestureRecogniser.state == .began { 
      let holdLocation = gestureRecogniser.location(in: MapView) 
      let coord = MapView.convert(holdLocation, toCoordinateFrom: MapView) 

      let annotationView: MKPinAnnotationView! 
      let annotationPoint = MKPointAnnotation() 

      self.clean() 

      annotationPoint.coordinate = coord 
      annotationPoint.title = "\(coord.latitude), \(coord.longitude)" 

      annotationView = MKPinAnnotationView(annotation: annotationPoint, reuseIdentifier: "Annotation 2") 
      MapView.addAnnotation(annotationView.annotation!) 
      addDirections(coor: coord) 
     } 
    } 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     MapView.delegate = self 
     locationManager.delegate = self 

     locationManager.desiredAccuracy = kCLLocationAccuracyBest 

     let span = MKCoordinateSpan(latitudeDelta: MapView.region.span.latitudeDelta/200, longitudeDelta: MapView.region.span.longitudeDelta/200) 
     let region = MKCoordinateRegion(center: MapView.region.center, span: span) 

     let dropPin = UILongPressGestureRecognizer(target: self, action: #selector(self.dropAnnotation(gestureRecogniser:))) 
     dropPin.minimumPressDuration = CFTimeInterval(1.0) 
     MapView.addGestureRecognizer(dropPin) 

     MapView.setRegion(region, animated: true) 
    } 

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

Answer 1

Peut-être MapView.userLocation.coordinate est nil.

Cochez la case "Emplacement de l'utilisateur" de MapView sur le Storyboard.

Answer 2

mapView(_:rendererFor:) retourne l'objet MKOverlayRenderer.

Remplacer

func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKPolylineRenderer { 

avec

func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {