polyline in subview (googlemaps) (swift)

func callWebService(){

        let url = NSURL(string: "https://maps.googleapis.com/maps/api/directions/json?origin=\(17.421542),\(78.452169)&destination=\(18.7603),\(73.8630)&waypoints=\(21.146052),\(79.088196)&key=AIzaSyDxSgGQX6jrn4iq6dyIWAKEOTneZ3Z8PtU")

        print(url)

        let request = NSURLRequest(URL: url!)

        

        let config = NSURLSessionConfiguration.defaultSessionConfiguration()

        let session = NSURLSession(configuration: config)

        

        let task = session.dataTaskWithRequest(request, completionHandler: {(data, response, error) in

            

            // notice that I can omit the types of data, response and error

            do{

                if let jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers) as? NSDictionary {

                    

                   print(jsonResult)

                     dispatch_async(dispatch_get_main_queue()) {

                    let routes = jsonResult.valueForKey("routes")

                   print(routes)

                    

                    let overViewPolyLine = routes![0]["overview_polyline"]!!["points"] as! String

                    print(overViewPolyLine)

//                    }

                    if overViewPolyLine != ""{

                        

                        //Call on Main Thread

//                        dispatch_async(dispatch_get_main_queue()) {

                        

                            self.addPolyLineWithEncodedStringInMap(overViewPolyLine)

                        }

                        

                        

                    }

                    

                }

            }

            catch{

                

                print("Somthing wrong")

            }

        });

        

        // do whatever you need with the task e.g. run

        task.resume()

    }

    

    func addPolyLineWithEncodedStringInMap(encodedString: String) {

        

        

        let camera = GMSCameraPosition.cameraWithLatitude(18.5204, longitude: 73.8567, zoom: 10.0)

        let mapView = GMSMapView.mapWithFrame(homeMapView.bounds, camera: camera)

//        mapView.myLocationEnabled = true

         homeMapView .addSubview(mapView)

        

        let path = GMSMutablePath(fromEncodedPath: encodedString)

        let polyLine = GMSPolyline(path: path)

        polyLine.strokeWidth = 5

        polyLine.strokeColor = UIColor.redColor()

        polyLine.map = mapView

        

        let smarker = GMSMarker()

        smarker.position = CLLocationCoordinate2D(latitude:17.421542, longitude: 78.452169)

        smarker.title = "nizam"

        smarker.snippet = "hyderabad"

        smarker.map = mapView

        

        let dmarker = GMSMarker()

        dmarker.position = CLLocationCoordinate2D(latitude: 18.7603, longitude: 73.8630)

        dmarker.title = "Chakan"

        dmarker.snippet = "Maharshtra"

        dmarker.map = mapView

        

      //  homeMapView = mapView

        

    }

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