当用户点击图钉时，我如何启动从用户位置固定注释的方向？

Posted 2023-02-27

【中文标题】当用户点击图钉时，我如何启动从用户位置固定注释的方向？

【英文标题】：How do i initiate directions to pin annotations from user location when the user taps the pin?

【发布时间】：2020-11-05 04:00:29

【问题描述】：

我有一个 mkannotationview 来生成我的注释点。我已经设置了用户位置权限，因此如果启用了授权，则会显示用户的位置。我现在希望当用户单击 pin 时，生成从用户位置到 pin 的最快路线（仅在启用位置授权时）。

【参考方案1】：

假设您已经创建了位置管理器

var currentPlacemark: CLPlacemark? 

@IBAction func getDirectionsTapped(_ sender: Any)  //action from storyboard to viewcontroller (command + drag)
    getAddress()


func getAddress()
    let overlays = mapView.overlays // these lines of code
    mapView.removeOverlays(overlays) // are to clean up your mapview when
    locationManager.stopUpdatingLocation() // a new directions request is made
    
    guard let currentPlacemark = currentPlacemark else 
        return
    
    
    let directionRequest = MKDirections.Request()
    let destinationPlacemark = MKPlacemark(placemark: currentPlacemark)
    
    directionRequest.source = MKMapItem.forCurrentLocation()
    directionRequest.destination = MKMapItem(placemark: destinationPlacemark)
    
    directionRequest.transportType = ."[your transport type]"

    let directions = MKDirections(request: directionRequest)
    directions.calculate  (directionsResponse, error) in
        guard let directionsResponse = directionsResponse else 
            if let error = error  // unused variable
                print("Error")
        
            return
    
        for route in directionsResponse.routes //for loop to show all possible routes or let route = directionsResponse.route[0] to get first route only
            self.mapView.addOverlay(route.polyline, level: .aboveRoads) //level is optional
            self.mapView.setVisibleMapRect(route.polyline.boundingMapRect, animated: true)
        
        
    
    locationManager.startUpdatingLocation()


func mapView(_ mapView: MKMapView, didSelect view: MKAnnotationView) 
    if let location = view.annotation as? [pointannotation name] 
    self.currentPlacemark = MKPlacemark(coordinate: location.coordinate)
    


func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer 
    let render = MKPolylineRenderer(overlay: overlay as! MKPolyline)
    render.strokeColor = //choose a color
    return render