如何创建溢出菜单(不在工具栏上)- Xamarin.Forms

using Xamarin.Forms;

Button overflowButton = new Button
{
    Text = "溢出菜单",
    HorizontalOptions = LayoutOptions.Center,
    VerticalOptions = LayoutOptions.Center
};

MenuItem menuItem1 = new MenuItem { Text = "菜单项1" };
MenuItem menuItem2 = new MenuItem { Text = "菜单项2" };
MenuItem menuItem3 = new MenuItem { Text = "菜单项3" };

PopupMenu popupMenu = new PopupMenu();
popupMenu.Items.Add(menuItem1);
popupMenu.Items.Add(menuItem2);
popupMenu.Items.Add(menuItem3);

overflowButton.Clicked += async (sender, e) =>
{
    await popupMenu.ShowAsync(sender as View);
};

using Xamarin.Forms;

namespace YourNamespace
{
    public class YourPage : ContentPage
    {
        public YourPage()
        {
            Button overflowButton = new Button
            {
                Text = "溢出菜单",
                HorizontalOptions = LayoutOptions.Center,
                VerticalOptions = LayoutOptions.Center
            };

            MenuItem menuItem1 = new MenuItem { Text = "菜单项1" };
            MenuItem menuItem2 = new MenuItem { Text = "菜单项2" };
            MenuItem menuItem3 = new MenuItem { Text = "菜单项3" };

            PopupMenu popupMenu = new PopupMenu();
            popupMenu.Items.Add(menuItem1);
            popupMenu.Items.Add(menuItem2);
            popupMenu.Items.Add(menuItem3);

            overflowButton.Clicked += async (sender, e) =>
            {
                await popupMenu.ShowAsync(sender as View);
            };

            Content = new StackLayout
            {
                Children = { overflowButton }
            };
        }
    }
}