在setRegion中封装路径MapKit swift

Question

我有一个带有标记（注释）的mapView和用户的地理位置。当用户点击其中一个标记时，我在用户位置和针尖位置之间画一条路线。

然而，用户位置上的地图缩放范围以及我能够做的唯一事情是将地图区域设置为远离用户。这不是正确的方法，所以我愿意找到放大或缩小的方法来最大化路线视图。

有办法吗？

这是我的代码：

//来自故事板的地图套接字     @IBOutlet弱var mapView：MKMapView！

//Geolocation variables
var locationManager = CLLocationManager()
var destination: MKMapItem?

在viewDidLoad

中

//Setting up delegate and CoreLocaton setup
        locationManager = CLLocationManager()
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.requestWhenInUseAuthorization()
        locationManager.startUpdatingLocation()

mapView.delegate = self
        mapView.showsUserLocation = true

let initialLocation = CLLocation(latitude: 45.5215374, longitude: -73.5811606)

        let regionRadius: CLLocationDistance = 2000
        func centerMapOnLocation(location: CLLocation) {
            let coordinateRegion = MKCoordinateRegionMakeWithDistance(location.coordinate,
                regionRadius * 2.0, regionRadius * 2.0)
            mapView.setRegion(coordinateRegion, animated: true)
        }

        //Ask the map to center itself
        centerMapOnLocation(initialLocation)

代表

//MAP DELEGATES
    func mapView(mapView: MKMapView!,
        didSelectAnnotationView view: MKAnnotationView!){

            //remove existing routes
            mapView.removeOverlays(mapView.overlays)

            //call for new route
            var destination = MKPlacemark(coordinate: view.annotation.coordinate, addressDictionary: nil)
            getDirection(destination)
    }


    //INTERACTION WITH ANNOTATIONS (MARKER)
    func mapView(mapView: MKMapView!, annotationView view: MKAnnotationView!,
        calloutAccessoryControlTapped control: UIControl!) {

            if control == view.rightCalloutAccessoryView {
                println("Disclosure Pressed! \(view.annotation.subtitle)")

                if let cpa = view.annotation as? MapArtwork {
                    println("cpa.imageName")
                }
            }

    }

    //UPDATE LOCATION
    func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {

        if (!locations.isEmpty)
        {

            let myLocation  = locations[0] as! CLLocation

            mapView.setRegion(MKCoordinateRegionMake(CLLocationCoordinate2DMake(myLocation.coordinate.latitude, myLocation.coordinate.longitude),
                MKCoordinateSpanMake(0.06, 0.06)), animated: true)
        }

        locationManager.stopUpdatingLocation()

    }

    //GET DIRECTION BETWEEN GEOPOSITION AND TOUCHED MARKER
    func getDirection(location:MKPlacemark){
        println("getting direction")
        destination = MKMapItem(placemark:location)

        let request = MKDirectionsRequest()
        request.setSource(MKMapItem.mapItemForCurrentLocation())
        request.setDestination(destination!)
        request.requestsAlternateRoutes = false

        let directions = MKDirections(request: request)

        directions.calculateDirectionsWithCompletionHandler({(response:
            MKDirectionsResponse!, error: NSError!) in

            if error != nil {
                // Handle error
                println(error)
            } else {
                self.showRoute(response)
            }

        })
    }

这是我在显示路线时设置地图区域的部分。

    //DISPLAY ROUTE OVERLAY
    func showRoute(response: MKDirectionsResponse) {
        println("showing route")
        for route in response.routes as! [MKRoute] {
            mapView.addOverlay(route.polyline,
                level: MKOverlayLevel.AboveRoads)

            for step in route.steps {
                println(step.instructions)
            }
        }
        let userLocation = mapView.userLocation
        let region = MKCoordinateRegionMakeWithDistance(
            userLocation.location.coordinate, 6000, 6000)

        mapView.setRegion(region, animated: true)
    }

    func mapView(mapView: MKMapView!, rendererForOverlay
        overlay: MKOverlay!) -> MKOverlayRenderer! {
            let renderer = MKPolylineRenderer(overlay: overlay)

            renderer.strokeColor = UIColor(red: 8.0/255.0, green: 47.0/255.0, blue: 62.0/255.0, alpha: 1.0)
            renderer.lineWidth = 5.0
            return renderer
    }