Entry render不在iOS Xamarin表单中添加下划线

using UIKit;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;

[assembly: ExportRenderer(typeof(Entry), typeof(CustomEntryRenderer))]
namespace YourNamespace
{
    public class CustomEntryRenderer : EntryRenderer
    {
        protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
        {
            base.OnElementChanged(e);

            if (Control != null)
            {
                // 创建一个带有下划线的文本样式
                var attributes = new UIStringAttributes
                {
                    UnderlineStyle = NSUnderlineStyle.Single
                };

                // 应用文本样式到原生文本输入框控件
                Control.AttributedText = new NSAttributedString(Control.Text, attributes);
            }
        }
    }
}