在xamarin ios中没有第二次触发本地通知

using Foundation;
using UIKit;
using UserNotifications;

namespace YourAppName.iOS
{
    [Register("AppDelegate")]
    public partial class AppDelegate : global::Xamarin.Forms.Platform.iOS.FormsApplicationDelegate
    {
        public override bool FinishedLaunching(UIApplication app, NSDictionary options)
        {
            // 注册通知设置
            UNUserNotificationCenter.Current.RequestAuthorization(UNAuthorizationOptions.Alert, (approved, error) => {
                // Handle approval
            });

            global::Xamarin.Forms.Forms.Init();
            LoadApplication(new App());

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

using Foundation;
using UIKit;
using UserNotifications;

namespace YourAppName.iOS
{
    public class LocalNotificationManager
    {
        public static void ScheduleNotification(string title, string body, double secondsFromNow)
        {
            // 创建通知内容
            var content = new UNMutableNotificationContent();
            content.Title = title;
            content.Body = body;

            // 创建通知触发器
            var trigger = UNTimeIntervalNotificationTrigger.CreateTrigger(secondsFromNow, false);

            // 创建通知请求
            var request = UNNotificationRequest.FromIdentifier("notification", content, trigger);

            // 安排通知请求
            UNUserNotificationCenter.Current.AddNotificationRequest(request, (error) => {
                if (error != null)
                {
                    // 处理错误
                }
            });
        }
    }
}