WaitTimeManagerDemo

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;

public class WaitTimeManager  
{
    private static TaskBehaviour m_Task;
    static WaitTimeManager()
    {
        GameObject go = new GameObject("#WaitTimeManager#");
        GameObject.DontDestroyOnLoad(go);
        m_Task = go.AddComponent ();
    }

    //等待
    static public Coroutine WaitTime(float time,UnityAction callback)
    {
        return m_Task.StartCoroutine (Coroutine(time,callback));
    }
    //取消等待
    static public void CancelWait(ref Coroutine coroutine)
    {
        if (coroutine != null) {
            m_Task.StopCoroutine (coroutine);
            coroutine = null;
        }
    }

    static IEnumerator Coroutine(float time,UnityAction callback){
        yield return new WaitForSeconds (time);
        if (callback != null) {
            callback ();
        }
    }
    //内部类
    class TaskBehaviour : MonoBehaviour{}
}
 

Demo:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class WaitTimeManagerDemo : MonoBehaviour {
    void Start () {

        //开启
        Coroutine coroutine = WaitTimeManager.WaitTime(5f,delegate {
            Debug.LogFormat("等待5秒后回调");
        });
        Coroutine coroutine2 = WaitTimeManager.WaitTime(2f, delegate {
            Debug.LogFormat("等待2秒后回调");
        });
        Coroutine coroutine3 = WaitTimeManager.WaitTime(3f, delegate {
            Debug.LogFormat("等待3秒后回调");
        });
        Coroutine coroutine4 = WaitTimeManager.WaitTime(4f, () => {
            Debug.LogFormat("等待4秒后回调");
        });     

        //取消
        WaitTimeManager.CancelWait(ref coroutine);

    }
}