Comment dessiner une route entre deux emplacements en utilisant MapKit dans Swift?

class MapController: UIViewController, MKMapViewDelegate {

func showRouteOnMap() {
    let request = MKDirectionsRequest()
    request.source = MKMapItem(placemark: MKPlacemark(coordinate: annotation1.coordinate, addressDictionary: nil))
    request.destination = MKMapItem(placemark: MKPlacemark(coordinate: annotation2.coordinate, addressDictionary: nil))
    request.requestsAlternateRoutes = true
    request.transportType = .Automobile

    let directions = MKDirections(request: request)

    directions.calculateDirectionsWithCompletionHandler { [unowned self] response, error in
        guard let unwrappedResponse = response else { return }

        if (unwrappedResponse.routes.count > 0) {
            self.mapView.addOverlay(unwrappedResponse.routes[0].polyline)
            self.mapView.setVisibleMapRect(unwrappedResponse.routes[0].polyline.boundingMapRect, animated: true)
        }
    }
}

func mapView(mapView: MKMapView!, rendererForOverlay overlay: MKOverlay!) -> MKOverlayRenderer! {
    if overlay is MKPolyline {
            var polylineRenderer = MKPolylineRenderer(overlay: overlay)
            polylineRenderer.strokeColor = UIColor.blueColor()
        polylineRenderer.lineWidth = 5
        return polylineRenderer
    }
    return nil
}

Le retour est un tableau de routes possibles, habituellement, nous voulons juste montrer la première. Les annotations sont les annotations de carte.

Swift 4

class MapController: UIViewController, MKMapViewDelegate {

// MARK: - showRouteOnMap

func showRouteOnMap(pickupCoordinate: CLLocationCoordinate2D, destinationCoordinate: CLLocationCoordinate2D) {

    let sourcePlacemark = MKPlacemark(coordinate: pickupCoordinate, addressDictionary: nil)
    let destinationPlacemark = MKPlacemark(coordinate: destinationCoordinate, addressDictionary: nil)

    let sourceMapItem = MKMapItem(placemark: sourcePlacemark)
    let destinationMapItem = MKMapItem(placemark: destinationPlacemark)

    let sourceAnnotation = MKPointAnnotation()

    if let location = sourcePlacemark.location {
        sourceAnnotation.coordinate = location.coordinate
    }

    let destinationAnnotation = MKPointAnnotation()

    if let location = destinationPlacemark.location {
        destinationAnnotation.coordinate = location.coordinate
    }

    self.mapView.showAnnotations([sourceAnnotation,destinationAnnotation], animated: true )

    let directionRequest = MKDirectionsRequest()
    directionRequest.source = sourceMapItem
    directionRequest.destination = destinationMapItem
    directionRequest.transportType = .automobile

    // Calculate the direction
    let directions = MKDirections(request: directionRequest)

    directions.calculate {
        (response, error) -> Void in

        guard let response = response else {
            if let error = error {
                print("Error: \(error)")
            }

            return
        }

        let route = response.routes[0]

        self.mapView.add((route.polyline), level: MKOverlayLevel.aboveRoads)

        let rect = route.polyline.boundingMapRect
        self.mapView.setRegion(MKCoordinateRegionForMapRect(rect), animated: true)
    }
}

// MARK: - MKMapViewDelegate

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

    let renderer = MKPolylineRenderer(overlay: overlay)

    renderer.strokeColor = UIColor(red: 17.0/255.0, green: 147.0/255.0, blue: 255.0/255.0, alpha: 1)

    renderer.lineWidth = 5.0

    return renderer
}