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	对象池模式经常用在频繁创建、销毁对象(并且对象创建、销毁开销很大)的场景。对象池模式管理一个可代替对象的集合。组件**从池中借出对象，用它来完成一些任务并当任务完成时归还该对象**。
被归还的对象接着满足请求，不管是同一个组件还是其他组件的请求。对象池模式可以管理那些代表的现实资源
或者通过重用来分摊昂贵初始化代价的对象。一般通过字典（Dictionary）来存储

using System.Collections;
using System.Collections.Generic;
using UnityEngine;namespace ns
{public interface IResetable{void OnReset();}///<summary>//////</summary>public class GameObjectPool : MonoBehaviour{private Dictionary<string, List<GameObject>> cache;private void Awake(){cache = new Dictionary<string, List<GameObject>>();}//public GameObject CreateObject(string key, GameObject prefab, Vector3 pos, Quaternion dir)//{//    //在池中查找禁用的物体//    GameObject go = null;//    if (cache.ContainsKey(key))//        go = cache[key].Find(o => !o.activeInHierarchy);//    if (go != null)//    {//        go.transform.position = pos;//        go.transform.rotation = dir;//        go.SetActive(true);//    }//    else//    {//        go = Instantiate(prefab, pos, dir);//        if (!cache.ContainsKey(key)) cache.Add(key, new List<GameObject>());//        cache[key].Add(go);//    }//    return go;//}/// <summary>/// 使用对象池创建对象/// </summary>/// <param name="key">对象种类</param>/// <param name="prefab">对象预制件</param>/// <param name="pos">位置</param>/// <param name="dir">旋转</param>/// <returns></returns>public GameObject CreateObject(string key, GameObject prefab, Vector3 pos, Quaternion dir){//1. 在池中查找可以使用的对象GameObject go = FindUsableObject(key);//2. 如果没有找到，则创建再加入池中。if (go == null){go = Instantiate(prefab);Add(key, go);}//3.使用对象UseObject(pos, dir, go);return go;}private void UseObject(Vector3 pos, Quaternion dir, GameObject go){go.transform.position = pos;go.transform.rotation = dir;go.SetActive(true);//go.GetComponent<Bullet>().CalculateTargetPosition();//go.GetComponent<IResetable>().OnReset();//遍历物体中所有需要重置的脚本foreach (var item in go.GetComponents<IResetable>()){item.OnReset();}}private void Add(string key, GameObject go){if (!cache.ContainsKey(key)) cache.Add(key, new List<GameObject>());cache[key].Add(go);}private GameObject FindUsableObject(string key){//字典如果存在当前记录，则在集合中查找禁用的物体if (cache.ContainsKey(key))return cache[key].Find(o => !o.activeInHierarchy);return null;}/// <summary>/// 立即回收/// </summary>/// <param name="go"></param>public void CollectObject(GameObject go){go.SetActive(false);}/// <summary>/// 延迟回收/// </summary>/// <param name="go"></param>public void CollectObject(GameObject go,float delay){StartCoroutine(DelayCollect(go, delay));}private IEnumerator DelayCollect(GameObject go, float delay){yield return new WaitForSeconds(delay);CollectObject(go);}public void Clear(string key){//释放游戏对象foreach (var item in cache[key]){Destroy(item);}//移除键cache.Remove(key);}public void ClearAll(){//Bug 1:异常 -- 无效的操作List<string> keyList = new List<string>(cache.Keys);foreach (var item in keyList){//遍历集合  移除字典记录Clear(item);} }//Bug 2 : 子弹不能沿枪的正前方发射 //解决方案：每次通过对象池创建对象，都调用IResetable接口方法，达到逻辑(计算目标点)重置的目的。}
}