title: add google map marker with tap and hold gesture
body: <p>I'm writing an app in Xamarin.IOS which has a controller that displays a Google Maps MapView, and I would like to add a marker when the user taps and holds over any point in the map</p>
  
  <p>So far I've tried to add the gesture recognizer to the MapView object, but its not working. This is my code for the map controller:</p>
  
  <pre class="lang-cs prettyprint-override"><code>public async override void ViewDidLoad ()
  {
      base.ViewDidLoad ();
      View.BackgroundColor = UIColor.White;
      var geolocator = new Geolocator { DesiredAccuracy = 50 };
      location = await geolocator.GetPositionAsync (10000);
  
      var camera = CameraPosition.FromCamera (latitude: location.Latitude, 
              longitude: location.Longitude, zoom: 6);
      mapView = MapView.FromCamera (RectangleF.Empty, camera);
      mapView.MyLocationEnabled = true;
  
      var longGesture = new UILongPressGestureRecognizer (LongPress);
      longGesture.MinimumPressDuration = 2.0;
      mapView.AddGestureRecognizer (longGesture);
  
      mapView.StartRendering ();
      View = mapView;
  }
  
  public override void ViewWillDisappear (bool animated)
  {   
      mapView.StopRendering ();
      base.ViewWillDisappear (animated);
  }
  
  [Export("LongPress")]
  void LongPress (UILongPressGestureRecognizer gesture)
  {
      Console.WriteLine (gesture.LocationInView(mapView).X + gesture.LocationInView(mapView).Y);
  }
  </code></pre>
  
  <p>the gesture handler is never called!</p>