title: drop pin with long touch in google maps
body: <p>i can't add marker with long touch in google maps in swift 
  i have try lots of codes but it doesn't work for me
  what should i do !?</p>
  
  <pre><code>override func viewDidLoad() {
  
      super.viewDidLoad()        
      GMSServices.provideAPIKey("AIzaSyBw95wEhcSiSBmPWuYkiK0_IBnZQK-Lm7I")
  
  
      locationManager.delegate = self
      locationManager.requestWhenInUseAuthorization()
      locationManager.desiredAccuracy = kCLLocationAccuracyBest
      locationManager.startUpdatingLocation()
  }
  
  func locationManager(manager: CLLocationManager, didFailWithError error: NSError) {
      print("Error" + error.description)
  }
  
  func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
      let userLocation = locations.last
      let center = CLLocationCoordinate2D(latitude: userLocation!.coordinate.latitude, longitude: userLocation!.coordinate.longitude)
  
      let camera = GMSCameraPosition.cameraWithLatitude(userLocation!.coordinate.latitude,
                                                        longitude: userLocation!.coordinate.longitude, zoom: 16)
      let mapView = GMSMapView.mapWithFrame(CGRectZero, camera: camera)
      mapView.myLocationEnabled = true
      mapView.settings.myLocationButton = true
      view = mapView
  
     let  position = CLLocationCoordinate2DMake(10, 10)
      let marker = GMSMarker(position: position)
  
  
      marker.opacity = 0.6
      marker.position = center
      marker.title = "Current Location"
      marker.snippet = ""
      marker.map = mapView
      //mapView.clear()
  }
  </code></pre>
  
  <p>Ant help would be appreciate  </p>