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

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(1))
        {

            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 * 200);

            //Destroy(o, 2);
        }
        else if (Input.GetMouseButtonDown(0))
        {
            o = ObjectPools.Instance.MyInstantiate(builPrefabGreen, transform.position, Quaternion.identity) as GameObject;

            o.rigidbody.AddForce(Vector3.forward * 200);
        }
    }
}

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 > 0) //弹夹里面有子弹
        {
            result = poolList[tag][0];//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()
    {

    }
}