更改位置坐标，更改图钉并在地图上重新绘制路线

Question

我已经使用故事板创建了一个单视图应用程序。我将 mkMapView 放在 ViewController 上并将其嵌入导航 controller.so 中，该程序显示了 MKMapView 中作为源坐标和目标坐标的两个引脚之间的路线。

   import UIKit
import MapKit

class ViewController: UIViewController, MKMapViewDelegate {
    @IBOutlet weak var mapView: MKMapView!
    var s = 0.0
    var t = 0.0
     var sourceLocation = CLLocationCoordinate2D(latitude: 40.759011, longitude: -73.984472)
    var destinationLocation = CLLocationCoordinate2D(latitude: 40.748441, longitude: -73.985564)

    override func viewDidLoad() {
        super.viewDidLoad()

        mapView.delegate = self

        self.dummy()
    }


    func dummy()
    {
        // 1.


        // 2.


        // 3.
        let sourcePlacemark = MKPlacemark(coordinate: sourceLocation, addressDictionary: nil)
        let destinationPlacemark = MKPlacemark(coordinate: destinationLocation, addressDictionary: nil)

        // 4.
        let sourceMapItem = MKMapItem(placemark: sourcePlacemark)
        let destinationMapItem = MKMapItem(placemark: destinationPlacemark)

        // 5.
        let sourceAnnotation = MKPointAnnotation()
        sourceAnnotation.title = "Times Square"

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


        let destinationAnnotation = MKPointAnnotation()
        destinationAnnotation.title = "Empire State Building"

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

        // 6.
        self.mapView.showAnnotations([sourceAnnotation,destinationAnnotation], animated: true )

        // 7.
        let directionRequest = MKDirectionsRequest()
        directionRequest.source = sourceMapItem
        directionRequest.destination = destinationMapItem
        directionRequest.transportType = .automobile

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

        // 8.
        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)
        }

    }

我在 mapView 上放置了一个 changeLatitude 按钮，我正在更改地图通过将当前源引脚位置分配给目标和源引脚位置纬度 s=s+0.02000 来增加引脚位置。并将源引脚放在新位置。

@IBAction func changeLatitude(_ sender: Any) {
     destinationLocation = CLLocationCoordinate2D(latitude: t, longitude: -73.984472)

    s=s+0.02000
    sourceLocation = CLLocationCoordinate2D(latitude: 40.759011-s, longitude: -73.984472)

     t=40.759011-s;
    self.refresh()
    self.dummy()

    //self.refresh(sender: AnyObject)

}

我已经从旧的源位置和旧的目标位置删除了旧的引脚，但旧的路线仍然存在我想删除旧的路线。我如何删除旧的路线？

   func refresh() {
        mapView.setCenter(mapView.userLocation.coordinate, animated: true)
        if self.mapView.overlays.count > 0
        {
            //let allAnnotations = self.mapView.annotations
            //self.mapView.removeAnnotations(allAnnotations)
           // self.mapView.removeOverlays(self.mapView.layoutGuides)
            self.mapView.removeAnnotations(self.mapView.annotations)


        }

    }

我在 about refresh() 函数中使用以下语句从 KMmapView 中删除旧图钉

self.mapView.removeAnnotations(self.mapView.annotations)

如何去除路由线？

您可以从这里下载示例项目 link https://www.dropbox.com/s/77m0395nyho9die/IOS9DrawRouteMapKitTutorial1.zip?dl=0

Answer 1

 self.mapView.removeOverlays(self.mapView.overlays)

试试这个，它会从您的地图中删除叠加层。

更改位置坐标，更改图钉并在地图上重新绘制路线

Change the location coordinates, change the pin and redraw the routes on a map

ios

swift3

mkmapview

mkannotation