如何使用Xamarin.Forms在iOS中创建圆角进度条

<ProgressBar x:Name="progressBar" HeightRequest="10" WidthRequest="200" Progress="0.5" ProgressColor="Blue" BackgroundColor="LightGray" />

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

[assembly: ExportRenderer(typeof(ProgressBar), typeof(YourNamespace.iOS.CustomProgressBarRenderer))]
namespace YourNamespace.iOS
{
    public class CustomProgressBarRenderer : ProgressBarRenderer
    {
        protected override void OnElementChanged(ElementChangedEventArgs<ProgressBar> e)
        {
            base.OnElementChanged(e);

            if (Control != null)
            {
                Control.Layer.CornerRadius = 5; // 设置圆角半径
                Control.ClipsToBounds = true; // 设置为true以裁剪圆角
            }
        }
    }
}

using YourNamespace.iOS;

namespace YourNamespace.iOS
{
    [Register("AppDelegate")]
    public partial class AppDelegate : global::Xamarin.Forms.Platform.iOS.FormsApplicationDelegate
    {
        public override bool FinishedLaunching(UIApplication app, NSDictionary options)
        {
            global::Xamarin.Forms.Forms.Init();
            LoadApplication(new App());

            // 注册自定义渲染器
            Xamarin.Forms.Platform.iOS.FormsMaterial.Init();
            Xamarin.Forms.Forms.SetFlags("CollectionView_Experimental");
            Xamarin.Forms.Forms.SetFlags("Shell_Experimental");
            Xamarin.Forms.Forms.SetFlags("RadioButton_Experimental");
            Xamarin.Forms.Forms.SetFlags("IndicatorView_Experimental");
            Xamarin.Forms.Forms.SetFlags("SwipeView_Experimental");
            Xamarin.Forms.Forms.SetFlags("Expander_Experimental");
            Xamarin.Forms.Forms.SetFlags("CarouselView_Experimental");
            Xamarin.Forms.Forms.SetFlags("Shapes_Experimental");
            Xamarin.Forms.Forms.SetFlags("MediaElement_Experimental");
            Xamarin.Forms.Forms.SetFlags("AppTheme_Experimental");
            Xamarin.Forms.Forms.SetFlags("AppThemeExperimental_Experimental");
            Xamarin.Forms.Forms.SetFlags("FastRenderers_Experimental");
            Xamarin.Forms.Forms.SetFlags("Markup_Experimental");
            Xamarin.Forms.Forms.SetFlags("Expander_Experimental");
            Xamarin.Forms.Forms.SetFlags("RadioButton_Experimental");
            Xamarin.Forms.Forms.SetFlags("SwipeView_Experimental");
            Xamarin.Forms.Forms.SetFlags("IndicatorView_Experimental");
            Xamarin.Forms.Forms.SetFlags("CarouselView_Experimental");
            Xamarin.Forms.Forms.SetFlags("Shapes_Experimental");
            Xamarin.Forms.Forms.SetFlags("MediaElement_Experimental");
            Xamarin.Forms.Forms.SetFlags("AppTheme_Experimental");
            Xamarin.Forms.Forms.SetFlags("AppThemeExperimental_Experimental");
            Xamarin.Forms.Forms.SetFlags("FastRenderers_Experimental");
            Xamarin.Forms.Forms.SetFlags("Markup_Experimental");

            return base.FinishedLaunching(app, options);
        }
    }
}