我知道这有点晚了，但这就是我在Xamarin中实现它的方式。我使用了一个带有按钮的框架作为组件的根元素，并创建了一个新的FrameRenderer。

using static Android.Views.Accessibility.AccessibilityNodeInfo;
using Action = Android.Views.Accessibility.Action;

...

[assembly: ExportRenderer(typeof(CustomStepper), typeof(CustomStepperRenderer))]
namespace MyApp.Core.Android.Renderers
{
    public class CustomStepperRenderer : FrameRenderer
    {

        public CustomStepperRenderer(Context context) : base(context) { }

        public override void OnInitializeAccessibilityEvent(AccessibilityEvent e)
        {
            base.OnInitializeAccessibilityEvent(e);
            e.ContentDescription = (Element as CustomStepper)?.Value.ToString();
        }

        public override bool PerformAccessibilityAction([GeneratedEnum] global::Android.Views.Accessibility.Action action, Bundle arguments)
        {
            var stepper = Element as CustomStepper;
            switch (action)
            {
                case ScrollForward: return stepper.Increment();
                case ScrollBackward: return stepper.Decrement();
            }
            return base.PerformAccessibilityAction(action, arguments);
        }

        public override void OnInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info)
        {
            base.OnInitializeAccessibilityNodeInfo(info);
            info.ClassName = "android.widget.seekbar";
            info.AddAction(AccessibilityAction.ActionScrollForward);
            info.AddAction(AccessibilityAction.ActionScrollBackward);
            info.ContentDescription = (Element as CustomStepper)?.Value.ToString();
        }
    }

}