ios - 如何在谷歌地图 iOS swift 中绘制两个位置之间的路线

Question

我在我的 iOS swift 项目中使用谷歌地图。我想在 map 上的两个位置之间绘制一条路径(不是直线)。知道怎么做吗？

Answer 1

在 Swift 中在 Google map 上的两个位置之间绘制折线。

//在此方法中传递您的源坐标和目标坐标。

func fetchRoute(from source: CLLocationCoordinate2D, to destination: CLLocationCoordinate2D) {
    
    let session = URLSession.shared
    
    let url = URL(string: "http://maps.googleapis.com/maps/api/directions/json?origin=\(source.latitude),\(source.longitude)&destination=\(destination.latitude),\(destination.longitude)&sensor=false&mode=driving")!
    
    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], let jsonResponse = jsonResult else {
            print("error in JSONSerialization")
            return
        }
        
        guard let routes = jsonResponse["routes"] as? [Any] else {
            return
        }
        
        guard let route = routes[0] as? [String: Any] else {
            return
        }

        guard let overview_polyline = route["overview_polyline"] as? [String: Any] else {
            return
        }
        
        guard let polyLineString = overview_polyline["points"] as? String else {
            return
        }
        
        //Call this method to draw path on map
        self.drawPath(from: polyLineString)
    })
    task.resume()
}

在 map 上绘制折线。

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