如何实现一个定时器

Timer:

代码语言：javascript复制

using System;
using UnityEngine;

/// <summary>
/// 时间单位
/// </summary>
public enum TimeUnit
{
    MILLSECOND, //毫秒
    SECOND,     //秒
    MINUTE,     //分钟
    HOUR,       //小时
}

/// <summary>
/// 定时器
/// </summary>
public class Timer
{
/// <summary>
/// 计时结束回调事件
/// </summary>
public event Action OnEnd;
/// <summary>
/// 计时更新事件
/// </summary>
public event Action<float> OnUpdate;

//定时时长
private float duration;
//开始计时时间
private float beginTime;
//已计时间
private float elapsedTime;
//缓存时间（用于暂停）
private float cacheTime;
//是否循环
private bool loop;
//是否暂停
private bool isPaused;
//是否计时完成
private bool isFinished;

/// <summary>
/// 构造函数
/// </summary>
/// <param name="duration">定时时长</param>
/// <param name="timeUnit">时间单位</param>
/// <param name="loop">是否循环</param>
public Timer(float duration, TimeUnit timeUnit = TimeUnit.SECOND, bool loop = false)
    {
switch (timeUnit)
        {
case TimeUnit.MILLSECOND:   this.duration = duration / 1000;  break;
case TimeUnit.SECOND:       this.duration = duration;         break;
case TimeUnit.MINUTE:       this.duration = duration * 60;    break;
case TimeUnit.HOUR:         this.duration = duration * 3600;  break;
        }
this.loop = loop;
        beginTime = Time.realtimeSinceStartup;
    }
/// <summary>
/// 更新定时器
/// </summary>
public void Update()
    {
if(!isFinished && !isPaused)
        {
            elapsedTime = Time.realtimeSinceStartup - beginTime;
            OnUpdate?.Invoke(Mathf.Clamp(elapsedTime, 0, duration));
if(elapsedTime >= duration)
            {
                OnEnd?.Invoke();
if (loop)
                {
                    beginTime = Time.realtimeSinceStartup;
                }
else
                {
                    isFinished = true;
                }
            }
        }
    }
/// <summary>
/// 暂停定时器
/// </summary>
public void Pause()
    {
if (!isFinished)
        {
            isPaused = true;
            cacheTime = Time.realtimeSinceStartup;
        }
    }
/// <summary>
/// 恢复定时器
/// </summary>
public void Unpause()
    {
if(!isFinished && isPaused)
        {
            beginTime  = Time.realtimeSinceStartup - cacheTime;
            isPaused = false;
        }
    }
/// <summary>
/// 停止定时器
/// </summary>
public void Stop()
    {
        isFinished = true;
    }
}

Example:

代码语言：javascript复制

    Timer timer;
private void Start()
    {
        timer = new Timer(3f);
        timer.OnEnd  = () => Debug.Log("计时结束 总计时长3秒");
        timer.OnUpdate  = v => Debug.Log($"计时中 已计时长{v}秒");
    }

private void Update()
    {
        timer.Update();
    }

timer

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