如何在xamarin窗体中使用自定义渲染器更改编辑器底部边框线颜色

// CustomEditor.cs
using Xamarin.Forms;

namespace YourNamespace
{
    public class CustomEditor : Editor
    {
        public static readonly BindableProperty BorderColorProperty =
            BindableProperty.Create(nameof(BorderColor), typeof(Color), typeof(CustomEditor), Color.Default);

        public Color BorderColor
        {
            get { return (Color)GetValue(BorderColorProperty); }
            set { SetValue(BorderColorProperty, value); }
        }
    }
}

// CustomEditorRenderer.Android.cs
using Android.Content;
using Android.Graphics;
using YourNamespace;
using Xamarin.Forms;
using Xamarin.Forms.Platform.Android;

[assembly: ExportRenderer(typeof(CustomEditor), typeof(CustomEditorRenderer))]
namespace YourNamespace.Droid
{
    public class CustomEditorRenderer : EditorRenderer
    {
        public CustomEditorRenderer(Context context) : base(context)
        {
        }

        protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.Editor> e)
        {
            base.OnElementChanged(e);
            if (Control != null)
            {
                var customEditor = Element as CustomEditor;
                Control.SetBackgroundColor(customEditor.BorderColor.ToAndroid());
                // 可以添加更多自定义样式设置
            }
        }
    }
}

// CustomEditorRenderer.iOS.cs
using UIKit;
using YourNamespace;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;

[assembly: ExportRenderer(typeof(CustomEditor), typeof(CustomEditorRenderer))]
namespace YourNamespace.iOS
{
    public class CustomEditorRenderer : EditorRenderer
    {
        protected override void OnElementChanged(ElementChangedEventArgs<Editor> e)
        {
            base.OnElementChanged(e);
            if (Control != null)
            {
                var customEditor = Element as CustomEditor;
                Control.Layer.BorderColor = customEditor.BorderColor.ToCGColor();
                Control.Layer.borderWidth = 1; // 设置边框宽度
            }
        }
    }
}

<!-- MainPage.xaml -->
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:YourNamespace"
             x:Class="YourNamespace.MainPage">
    <StackLayout>
        <local:CustomEditor BorderColor="Blue" />
    </StackLayout>
</ContentPage>