Xamarin iOS后台任务

using System;
using UIKit;

namespace BackgroundTaskExample
{
    public class BackgroundTaskManager
    {
        private UIApplication _application;
        private nint _taskId;

        public BackgroundTaskManager()
        {
            _application = UIApplication.SharedApplication;
        }

        public void StartBackgroundTask()
        {
            _taskId = _application.BeginBackgroundTask("MyBackgroundTask");
            if (_taskId != UIApplication.BackgroundTaskInvalid)
            {
                // 执行后台任务
                Task.Run(() =>
                {
                    // 模拟长时间运行的任务
                    System.Threading.Thread.Sleep(30000);

                    // 结束后台任务
                    _application.EndBackgroundTask(_taskId);
                });
            }
        }
    }
}