如何使用Google api Swift在GMSmap视图swift上绘制路线（非直线）

Question

我正在尝试使用Google Direction API在mapview上绘制路线。我正在使用来自stackoverflow本身的解决方案，但是我遇到了一些关于初始化器的错误。方向路线也将与google map本身相同或为一条直线。任何帮助表示赞赏。 也应该在哪里调用此方法我收到错误消息无法为类型为'（g坐标：字符串，字符串，坐标：字符串，字符串）的参数列表的'GMSCoordinateBounds'类型调用初始化程序]下面是代码。

 func getRouteSteps(from source: CLLocationCoordinate2D, to destination: CLLocationCoordinate2D) {

        let session = URLSession.shared

        let url = URL(string: "https://maps.googleapis.com/maps/api/directions/json?origin=\(lat),\(long)&destination=\(directionlat),\(directionlong)&sensor=false&mode=driving&key=\(API KEY)")!

        let task = session.dataTask(with: url, completionHandler: {
            (data, response, error) in

            guard error == nil else {
                print(error!.localizedDescription)
                return
            }

            guard let jsonResult = try? JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? [String: Any] else {

                print("error in JSONSerialization")
                return

            }



            guard let routes = jsonResult!["routes"] as? [Any] else {
                return
            }

            guard let route = routes[0] as? [String: Any] else {
                return
            }

            guard let legs = route["legs"] as? [Any] else {
                return
            }

            guard let leg = legs[0] as? [String: Any] else {
                return
            }

            guard let steps = leg["steps"] as? [Any] else {
                return
            }
            for item in steps {

                guard let step = item as? [String: Any] else {
                    return
                }

                guard let polyline = step["polyline"] as? [String: Any] else {
                    return
                }

                guard let polyLineString = polyline["points"] as? String else {
                    return
                }

                //Call this method to draw path on map
                DispatchQueue.main.async {
                    self.drawPath(from: polyLineString)
                }

            }
        })
        task.resume()
    } 

绘制折线的功能

 func drawPath(from polyStr: String){
        let mapView: GMSMapView
        let path = GMSPath(fromEncodedPath: polyStr)
        let polyline = GMSPolyline(path: path)
        polyline.strokeWidth = 3.0
        polyline.map = mapView // Google MapView

//
        let cameraUpdate = GMSCameraUpdate.fit(GMSCoordinateBounds(coordinate: "\(lat)","\(long)", coordinate: "\(directionlat)","\(directionlong)")) as? [String : AnyObject]
        mapView.moveCamera(cameraUpdate)
        let currentZoom = mapView.camera.zoom
        mapView.animate(toZoom: currentZoom - 1.4)
    }

Answer 1

GMSCoordinatesBounds将CLLocationCoordinates2D类型作为参数，而不是String。

这里是正确的代码：

let camera = GMSCameraUpdate.fit(GMSCoordinateBounds(coordinate: CLLocationCoordinate2D(latitude: Double(lat), longitude: Double(long)), coordinate: CLLocationCoordinate2D(latitude: Double(directionlat), longitude: Double(directionlat))))