我正在使用谷歌距离API["https://maps.googleapis.com/maps/api/directions/json?origin=" +start.latitude + "," + start.longitude +"&destination=" + end.latitude +"," + end.longitude + "&alternatives=false" +"&mode=driving&key=" + key;]来获取从起点到终点的路线。
我正在使用以下代码在起点和目的地之间绘制路线:
func drawPath()
{
if polylines != nil {
polylines?.map = nil
polylines = nil
}
if animationPolyline != nil {
self.animationIndex = 0
self.animationPath = GMSMutablePath()
self.animationPolyline.map = nil
if self.timer != nil {
self.timer.invalidate()
}
}
setupStartRideLocationMarkup(CLLocationCoordinate2D(latitude: (currentLocation?.coordinate.latitude)!, longitude: (currentLocation?.coordinate.longitude)!))
if currentLocation != nil && destinationLocation != nil {
let origin = "\((currentLocation?.coordinate.latitude)!),\((currentLocation?.coordinate.longitude)!)"
let destination = "\((destinationLocation?.latitude)!),\((destinationLocation?.longitude)!)"
let url = "https://maps.googleapis.com/maps/api/directions/json?origin=\(origin)&destination=\(destination)&mode=driving&key=MY_API_KEY"
Alamofire.request(url).responseJSON { response in
let json = JSON(data: response.data!)
self.jsonRoute = json
let routes = json["routes"].arrayValue
for route in routes
{
let routeOverviewPolyline = route["overview_polyline"].dictionary
let points = routeOverviewPolyline?["points"]?.stringValue
self.path = GMSPath.init(fromEncodedPath: points!)!
self.polylines = GMSPolyline.init(path: self.path)
self.polylines?.geodesic = true
self.polylines?.strokeWidth = 5
self.polylines?.strokeColor = UIColor.black
self.polylines?.map = self.mapView
}
self.shouldDrawPathToStartLocation()
self.shouldDrawPathToEndLocation()
if routes.count > 0 {
self.startAnimatingMap()
}
}
}
}
正如您所看到的,我正在使用来自api的编码路径初始化路径。现在我想从整个路径中删除已经行驶过的GMSPolyline。我该怎么做?我的当前直觉是应该在didUpdateLocations方法中实现。以下是我的didUpdateLocations方法的代码:
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
currentLocation = locations.last!
let camera = GMSCameraPosition.camera(withLatitude: (currentLocation?.coordinate.latitude)!,
longitude: (currentLocation?.coordinate.longitude)!,
zoom: zoomLevel)
if (mapView?.isHidden)! {
mapView?.isHidden = false
mapView?.camera = camera
} else {
mapView?.animate(to: camera)
}
updatePolyLineIfRequired()
}
在updatePolyLineIfRequired中,我想要移除已行驶的折线。
func updatePolyLineIfRequired(){
if GMSGeometryIsLocationOnPath((currentLocation?.coordinate)!, path, true) {
if startPolyline != nil {
startPolyline?.map = nil
startPolyline = nil
}
}
}
我希望实现类似于Uber或Careem的解决方案,其中绘制的GMSPolyline会被删除,直到用户当前位置。
提前感谢您。 附言:我正在使用Alamofire SwiftyJSON。