如何在Xamarin表单中向条目中添加文本之前加载视图

public class LoadingView : View
{
    // 添加自定义属性和方法
}

[assembly: ExportRenderer(typeof(LoadingView), typeof(LoadingViewRenderer))]
namespace YourNamespace.Droid
{
    public class LoadingViewRenderer : ViewRenderer<LoadingView, Android.Views.View>
    {
        public LoadingViewRenderer(Context context) : base(context)
        {
        }

        protected override void OnElementChanged(ElementChangedEventArgs<LoadingView> e)
        {
            base.OnElementChanged(e);

            if (Control == null)
            {
                // 创建并设置原生控件
                var nativeView = new Android.Views.View(Context);
                SetNativeControl(nativeView);
            }
        }
    }
}

[assembly: ExportRenderer(typeof(LoadingView), typeof(LoadingViewRenderer))]
namespace YourNamespace.iOS
{
    public class LoadingViewRenderer : ViewRenderer<LoadingView, UIView>
    {
        protected override void OnElementChanged(ElementChangedEventArgs<LoadingView> e)
        {
            base.OnElementChanged(e);

            if (Control == null)
            {
                // 创建并设置原生控件
                var nativeView = new UIView();
                SetNativeControl(nativeView);
            }
        }
    }
}

var loadingView = new LoadingView();
// 将loadingView添加到条目中