unity 游戏开发——倒计时功能

using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.Threading;
using UnityEngine;

public class CountDownTool
{
    static Timer timer = new Timer(TimerCallBack);
    static Stopwatch stopwatch = new Stopwatch();

    /// <summary>
    /// 是否完成
    /// </summary>
    public static bool Complete { get; private set; }

    /// <summary>
    /// 时间限制
    /// </summary>
    static TimeSpan Restrict { get; set; }

    /// <summary>
    /// 倒计时时间
    /// </summary>
    public static TimeSpan CountDown
    {
        get
        {
          &nbs