Question

我正在Xamarin.IOS中编写一个应用程序，它有一个显示Google Maps MapView的控制器，我想在用户点击并保持地图中的任何一点时添加一个标记

到目前为止，我已尝试将手势识别器添加到MapView对象，但它无法正常工作。这是我的地图控制器代码：

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);
}

永远不会调用手势处理程序！

Answer 1

事实证明，我不需要添加手势来完成此任务。 MapView对象公开了一个我可以订阅的事件：

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

添加谷歌地图标记，点击并按住手势

1 个答案: