Question

如何在选择新地图后从地图中删除注释？所以，假设我在X和Y坐标上选择了引脚，并希望将此引脚移动到另一个地方而不添加新引脚。同样简单的map.RemoveAnnotations();不起作用。

以下是依赖于它的代码：

map = new MKMapView(new CGRect(0, 74 + point * 13, UIScreen.MainScreen.Bounds.Width, (UIScreen.MainScreen.Bounds.Height - (74 + point * 20))));
map.UserInteractionEnabled = true;
map.ZoomEnabled = true;
map.ScrollEnabled = true;
map.MapType = MKMapType.Standard;
map.ShowsUserLocation = true;


var longTap = new UILongPressGestureRecognizer() { };
longTap.AddTarget(() => AddPin(longTap, slider.Value));
longTap.MinimumPressDuration = 2.0;
map.AddGestureRecognizer(longTap);

map.GetViewForAnnotation += (mapView, annotation) =>
{

        anView = new MKAnnotationView(annotation, Resources.kClusterAnnotationId);
        anView.ClipsToBounds = true;
        anView.CanShowCallout = false;
        anView.Image = UIImage.FromFile("Icons/customMapPin.png");


    return anView;
};

private void AddPin(UILongPressGestureRecognizer longTap, float value)
{
    if (ifPointExist == false)
    {
        ifPointExist = true;
        touchPoint = longTap.LocationInView(map);
        pinMapCords = this.map.ConvertPoint(touchPoint, map);
        CLLocation loc = new CLLocation(pinMapCords.Latitude, pinMapCords.Longitude);
        map.AddAnnotations(new MKPointAnnotation()
        {
            Coordinate = new CLLocationCoordinate2D(pinMapCords.Latitude, pinMapCords.Longitude)
        });
        CLGeocoder geocoder = new CLGeocoder();
        geocoder.ReverseGeocodeLocation(loc, (CLPlacemark[] placemarks, NSError error) =>
        {
            str = placemarks[0].AddressDictionary;
            str.ToString();
        });
        AddCircle(value);
        MKCoordinateSpan span = new MKCoordinateSpan(0.10, 0.10);
        var coords = new CLLocationCoordinate2D(pinMapCords.Latitude, pinMapCords.Longitude);
        map.Region = new MKCoordinateRegion(coords, span);
        ifPointExist = false;
    }
}

提前致谢

从地图中删除注释

0 个答案: