添加谷歌地圖標記點擊並按住手勢

Question

我正在Xamarin.IOS中編寫一個應用程序，它有一個顯示Google Maps MapView的控制器，並且我想在用戶點擊並保留任何點時添加標記在地圖

到目前爲止，我試圖將手勢識別器添加到MapView對象，但它不工作。這是我的地圖控制器的代碼：

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); 
} 

手勢處理程序永遠不會被調用！

Answer 1

事實證明，我不需要添加手勢來完成此操作。 MapView對象公開了我可以訂閱的事件：

mapView.LongPress += HandleLongPress; 
void HandleLongPress (object sender, GMSCoordEventArgs e) 
{ 
//Here I can add my marker. e contains the location point where the user tapped... 
}