Question

我在谷歌地图上显示了一些车辆（来自API的纬度和经度）。我正在获得纬度和来自storingDataOftripLocDetails()方法的经度。我每隔2秒就调用一次该方法。

获得lat＆amp;我正在展示一个标记。而这里因为计时器我的谷歌地图也令人耳目一新。但我的要求是我只需刷新标记。

我应该如何实现这一目标？

var driverLatitude: Double?
var driverLongitude: Double?

以下方法调用timer

override func viewDidLoad() {
        self.tripLocDetailsTimer = Timer.scheduledTimer(timeInterval: 2, target: self, selector: #selector(tripLocDetailCustomrWebserviceCall), userInfo: nil, repeats: true)
}

这是从API获取数据。并调用showsThePath（）

func storingDataOftripLocDetails(_ data: TripLocationDetailsResponse){
        self.driverLatitude = data.locationDetails?.driverDetails?.pickupLatitude
        self.driverLongitude = data.locationDetails?.driverDetails?.pickupLongitude
        self.showingThePath()
}

这里用以下方法显示1个标记＆amp;显示路径

 func showingThePath(){

            let vehicleLocation = CLLocationCoordinate2D(latitude: CLLocationDegrees(self.driverLatitude!), longitude: CLLocationDegrees(self.driverLongitude!))
            let cabIM = UIImageView(frame: CGRect(x: 0, y: 0, width: 40, height: 15))
            cabIM.image = UIImage(named: "bike_color")
            let vehicleImage = GMSMarker()
            vehicleImage.iconView = cabIM
            vehicleImage.infoWindowAnchor = CGPoint(x: 0.44, y: 0.40)
            vehicleImage.tracksViewChanges = false
            vehicleImage.position = vehicleLocation
            vehicleImage.map = self.mapView


        let origin = "\(String(describing: driverLatitude)),\(String(describing: driverLongitude))"
        let destination = "\(String(describing: pickupLatitude!)),\(String(describing: pickupLongitude!))"

        let url = URL(string: "https://maps.googleapis.com/maps/api/directions/json?origin=\(origin)&destination=\(destination)")
        URLSession.shared.dataTask(with: url!, completionHandler: {(data, response, error) in
            if(error != nil){
            }else{
                do{
                    let json = try JSONSerialization.jsonObject(with: data!, options:.allowFragments) as! [String : AnyObject]
                    print(json)
                    if json["status"] as! String == "OK"
                    {
                        let routes = json["routes"] as! [[String:AnyObject]]
                        OperationQueue.main.addOperation({
                            for route in routes
                            {
                                let routeOverviewPolyline = route["overview_polyline"] as! [String:String]
                                let points = routeOverviewPolyline["points"]
                                let path = GMSPath.init(fromEncodedPath: points!)
                                self.path = GMSPolyline(path: path)
                                self.path.strokeColor = .gray
                                self.path.strokeWidth = 3.0
                                self.path.map = self.mapView
                            }
                        })
                    }
                }catch let error as NSError{
                    print(error)
                }
            }
        }).resume()
    }

如何刷新谷歌地图上的标记，而不使用swift

0 个答案: