使用swift和Mapkit显示用户当前位置到特定位置之间的路径

let locationManager = CLLocationManager()
locationManager.requestWhenInUseAuthorization()

locationManager.delegate = self

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    guard let location = locations.last else { return }
    let userLocation = location.coordinate
    // 在地图上显示用户当前位置
    mapView.showsUserLocation = true
    mapView.userLocation.title = "Your Location"
    mapView.setCenter(userLocation, animated: true)
}

let destinationCoordinate = CLLocationCoordinate2D(latitude: destinationLatitude, longitude: destinationLongitude)
let destinationAnnotation = MKPointAnnotation()
destinationAnnotation.coordinate = destinationCoordinate
destinationAnnotation.title = "Destination"
mapView.addAnnotation(destinationAnnotation)

let request = MKDirections.Request()
request.source = MKMapItem(placemark: MKPlacemark(coordinate: userLocation))
request.destination = MKMapItem(placemark: MKPlacemark(coordinate: destinationCoordinate))
request.transportType = .automobile

let directions = MKDirections(request: request)
directions.calculate { (response, error) in
    guard let route = response?.routes.first else { return }
    // 在地图上显示路径
    self.mapView.addOverlay(route.polyline)
}

mapView.delegate = self

func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
    if let polyline = overlay as? MKPolyline {
        let renderer = MKPolylineRenderer(overlay: polyline)
        renderer.strokeColor = UIColor.blue
        renderer.lineWidth = 3
        return renderer
    }
    return MKOverlayRenderer()
}