Question

我使用故事板创建了一个视图应用程序。我将mkMapView放在ViewController上并将其嵌入导航控制器中。因此程序显示MKMapView中两个引脚之间的路径，即源和目标坐标。

   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，我正在更改地图引脚位置通过将当前源引脚位置分配到目标和源引脚位置纬度 s = s + 0.02000 递增。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)

}

我已从旧源和旧目的地位置移除旧针，但旧路线仍在那里我想删除旧路线。如何删除旧路线？

   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)


        }

    }

我使用about refresh（）函数

中的以下语句从KMmapView中删除旧引脚

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

如何删除路线？。

您可以从此链接https://www.dropbox.com/s/77m0395nyho9die/IOS9DrawRouteMapKitTutorial1.zip?dl=0

下载示例项目

Answer 1

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

尝试此操作即可从地图中删除叠加层。

更改位置坐标，更改引脚并在地图上重绘路线

1 个答案: