unity3d对象池的使用

说对象池之前首先来看看单例类和单例脚本的区别。这里有介绍

http://blog.csdn.net/lzhq1982/article/details/12649281

使用对象池的好处是不用每次都创建对象。销毁在创建，比如子弹的发射，当创建好的子弹。可以在使用后保存到对象池里面。当用的时候。直接从对象池中取即可

这里随便举个列子

鼠标左键单击发射蓝色球。右键发射红色球

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Main Camera挂载Fire.cs脚本

GameObject挂载单列脚本ObjectPools.cs

Fire.cs代码

 using UnityEngine;
 using System.Collections;

 public class Fire : MonoBehaviour
 {

     public GameObject builPrefabRed;

     public GameObject builPrefabGreen;

     GameObject o;

     // Use this for initialization
     void Start()
     {

     }

     // Update is called once per frame
     void Update()
     {

         if (Input.GetMouseButtonDown())
         {

             o = ObjectPools.Instance.MyInstantiate(builPrefabRed, transform.position, Quaternion.identity) as GameObject;

             //o = Instantiate(builPrefab, transform.position, Quaternion.identity) as GameObject;

             o.rigidbody.AddForce(Vector3.forward * );

             //Destroy(o, 2);
         }
         else if (Input.GetMouseButtonDown())
         {
             o = ObjectPools.Instance.MyInstantiate(builPrefabGreen, transform.position, Quaternion.identity) as GameObject;

             o.rigidbody.AddForce(Vector3.forward * );
         }
     }
 }

ObjectPools.cs类

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

 /// <summary>
 /// 对象池脚本
 ///
 /// 管理子弹。当子弹用完后。回收
 /// </summary>
 public class ObjectPools : MonoBehaviour
 {

     GameObject result;

     List<GameObject> poolsred;

     Dictionary<string, List<GameObject>> poolList;

     private static ObjectPools instance;

     public static ObjectPools Instance
     {
         get { return instance; }
         //set { ObjectPools.instance = value; }
     }

     void Awake()
     {
         poolsred = new List<GameObject>(); //实例化对象池

         instance = this; //单列

         poolList = new Dictionary<string, List<GameObject>>();
     }
     string tag;
     public GameObject MyInstantiate(GameObject prefab, Vector3 position, Quaternion rotation)
     {
         tag = prefab.tag;
         //如果有某个小集合的key，并且小集合内元素数量大于0
         if (poolList.ContainsKey(tag) && poolList[tag].Count > ) //弹夹里面有子弹
         {
             result = poolList[tag][];//取弹夹里面的第一颗子弹
             poolList[tag].Remove(result); //从弹夹移除子弹

             result.transform.position = position;
             result.transform.rotation = rotation;
         }
         else
         {

             if (!poolList.ContainsKey(tag))
             {
                 poolList.Add(tag, new List<GameObject>());
             }
             result = Instantiate(prefab, position, rotation) as GameObject;
         }
         //开启协程方法
         StartCoroutine(ReturnToPools(result));
         result.SetActive(true);
         return result;
     }

     /// <summary>
     /// 协程 同步方法 在同一个线程里面
     /// </summary>
     /// <param name="bullet"></param>
     /// <returns></returns>
     public IEnumerator ReturnToPools(GameObject bullet)
     {
         yield return new WaitForSeconds(2f); //等待2秒

         poolList[bullet.tag].Add(bullet);

         //poolsred.Add(bullet);

         //取消力
         bullet.rigidbody.velocity = Vector3.zero;

         bullet.SetActive(false);
     }

     // Use this for initialization
     void Start()
     {

     }

     // Update is called once per frame
     void Update()
     {

     }
 }