如何在Xamarin表单中自定义AutoCompleteTextView

using Xamarin.Forms;

namespace CustomControls
{
    public class CustomAutoCompleteTextView : View
    {
        public static readonly BindableProperty ItemsSourceProperty =
            BindableProperty.Create(nameof(ItemsSource), typeof(IEnumerable), typeof(CustomAutoCompleteTextView), null);

        public IEnumerable ItemsSource
        {
            get { return (IEnumerable)GetValue(ItemsSourceProperty); }
            set { SetValue(ItemsSourceProperty, value); }
        }

        public CustomAutoCompleteTextView()
        {
            var entry = new Entry();
            var listView = new ListView
            {
                IsVisible = false,
                ItemTemplate = new DataTemplate(() =>
                {
                    var cell = new TextCell();
                    cell.SetBinding(TextCell.TextProperty, ".");
                    return cell;
                })
            };

            entry.TextChanged += (sender, e) =>
            {
                var searchText = e.NewTextValue;
                var filteredItems = ItemsSource?.Cast<string>().Where(item => item.Contains(searchText));
                listView.ItemsSource = filteredItems;
                listView.IsVisible = !string.IsNullOrEmpty(searchText);
            };

            listView.ItemSelected += (sender, e) =>
            {
                entry.Text = e.SelectedItem as string;
                listView.IsVisible = false;
            };

            Content = new StackLayout
            {
                Children = { entry, listView }
            };
        }
    }
}

var autoCompleteTextView = new CustomAutoCompleteTextView();
autoCompleteTextView.ItemsSource = new List<string> { "Apple", "Banana", "Orange", "Mango" };