在 Xamarin.Forms.GoogleMaps 中带有点击事件的 pin 标记工具提示内的多个标签

Question

我正在使用 XamarinForms.GoogleMaps。是否可以在 Pin 的工具提示内显示堆叠的多个标签？我想通过单击每个标签来执行某些操作。 我看到我只能将标签文本传递给Label属性

  Pins.Add(new Pin
                    {
                        Type = PinType.Place,
                        Address = ””,
                        Label = “label text goes here”,
                        Position = new Position(Convert.ToDouble(obj.GeoLat),
                            Convert.ToDouble(obj.GeoLng))
                    });

要求输出应该是这样的：

Answer 1

1. 在CustomPin 类中添加新属性。

public string[] Details { get; set; }

1. 赋值。

CustomPin pin = new CustomPin
{
    Type = PinType.Place,
    Position = new Position(37.79752, -122.40183),
    Label = "Test",
    Address = "394 Pacific Ave, San Francisco CA",
    Name = "Xamarin",
    Url = "http://xamarin.com/about/",

    Details = new string[] {"111","222","333"}  //this line
};

1. 在自定义渲染器中构建界面。

 void OnDidSelectAnnotationView(object sender, MKAnnotationViewEventArgs e)
        {
            CustomMKAnnotationView customView = e.View as CustomMKAnnotationView;
            CustomPin pin = GetCustomPin(customView.Annotation as MKPointAnnotation);

            customPinView = new UIView();
            customPinView.BackgroundColor = UIColor.Red;
            if (customView.Name.Equals("Xamarin"))
            {

                int index = 0;
                foreach(var item in pin.Details)
                {
                    UILabel label = new UILabel(new CGRect(0, index * 30, 100, 20));
                    label.BackgroundColor = UIColor.White;
                    label.TextAlignment = UITextAlignment.Center;
                    label.Text = item;
                    customPinView.Add(label);
                    index++;
                }
                customPinView.Frame = new CGRect(0, 0, 100, index*30);
                customPinView.Center = new CGPoint(0, -(e.View.Frame.Height + 75));
                e.View.AddSubview(customPinView);
            }
        }

更新

如果你使用 XamarinForm.GoogleMaps，Pin类是密封类所以我们不能创建子类，但是我们可以用Tag 属性设置值，参考here。

//xaml

pin.Tag = new string[] {"111","222","333"};

//custom renderer
 string[] details = pin.Tag as string[];
 foreach(var item in details)
 {
      UILabel label = new UILabel(new CGRect(0, index * 30, 100, 20));
      label.BackgroundColor = UIColor.White;
      label.TextAlignment = UITextAlignment.Center;
      label.Text = item;
      customPinView.Add(label);
      index++;
 }