如何在 Swift 中使用 MapKit 在两个位置之间绘制路线？

Question

How can I draw a route between user's current location to a specific location using MapKit in Swift?

I searched a lot, but didn't find any helpful Swift-specific links or tutorials.

Answer 1

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
}

Answer 2

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
}

The return is an array of possible routes, usually we just want to show the first. The annotations are the map annotations.

Answer 3

Swift 5 + Extension based on bdelrahman Mohamed's answer

extension MKMapView {

  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.showAnnotations([sourceAnnotation,destinationAnnotation], animated: true )
    
    let directionRequest = MKDirections.Request()
    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.addOverlay((route.polyline), level: MKOverlayLevel.aboveRoads)
        let rect = route.polyline.boundingMapRect
        self.setRegion(MKCoordinateRegion(rect), animated: true)
    }
}}

Answer 4

override func viewDidLoad() { super.viewDidLoad()

     mapView.delegate = self
    
    let sourceLocation = CLLocationCoordinate2D(latitude: 22.4649, longitude: 69.0702)
    let destinationLocation = CLLocationCoordinate2D(latitude: 23.0225, longitude: 72.5714)
    
    let span = MKCoordinateSpan(latitudeDelta: 0.1, longitudeDelta: 0.1)
    
    let sourceRegion = MKCoordinateRegion(center: sourceLocation, span: span)
    mapView.setRegion(sourceRegion, animated: true)
    
    let destinationRegion = MKCoordinateRegion(center: destinationLocation, span: span)
    mapView.setRegion(destinationRegion, animated: true)
    
    let sourcePin = MKPointAnnotation()
    sourcePin.coordinate = sourceLocation
    mapView.addAnnotation(sourcePin)
    
    let destinationPin = MKPointAnnotation()
    destinationPin.coordinate = destinationLocation
    mapView.addAnnotation(destinationPin)
    

    let sourcePlacemark = MKPlacemark(coordinate: sourceLocation, addressDictionary: nil)
    let destinationPlacemark = MKPlacemark(coordinate: destinationLocation, addressDictionary: nil)
    
    let directionRequest = MKDirections.Request()
    directionRequest.source = MKMapItem(placemark: sourcePlacemark)
    directionRequest.destination = MKMapItem(placemark: destinationPlacemark)
    directionRequest.transportType = .automobile
    
    let directions = MKDirections(request: directionRequest)
    directions.calculate { (response, error) in
       guard let response = response else {
        if let error = error {
            print("Error: \(error)")
        }
            return
        }
        let route = response.routes[0]
        self.mapView.addOverlay((route.polyline), level: MKOverlayLevel.aboveRoads)
        
        let rect = route.polyline.boundingMapRect
        self.mapView.setRegion(MKCoordinateRegion(rect), animated: true)
    }

func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
     let renderer = MKPolylineRenderer(overlay: overlay)
    renderer.strokeColor = UIColor.red
    renderer.lineWidth = 4.0
    return renderer
}