Unity中对象池的使用

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

public class GameObjectPool : MonoBehaviour {
    //单例模式
    private static GameObjectPool instance;

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

    private static Dictionary<string, ArrayList> pool = new Dictionary<string, ArrayList>{ };
    // Use this for initialization
    void Start ()
    {
        Instance = this;
    }
    public static Object Get(string prefabName, Vector3 position, Quaternion rotation)
    {
        string key = prefabName + "(Clone)";
        Object o;
       //池中存在，则从池中取出
        if (pool.ContainsKey(key) && pool[key].Count>0)
        {
            ArrayList list=pool[key];
            o=list[0] as Object;
            list.Remove(o);
            //重新初始化相关状态
            (o as GameObject).SetActive(true);
            (o as GameObject).transform.position = position;
            (o as GameObject).transform.rotation = rotation;
        }
        //池中没有则实例化gameobejct
        else
        {
            o = Instantiate(Resources.Load(prefabName),position,rotation);
        }
          return o;
    }
    

    public static Object Return(GameObject o)
    {
        string key = o.name;
        if (pool.ContainsKey(key))
        {
            ArrayList list=pool[key];
            list.Add(o);
        }
        else
        {
            pool[key] = new ArrayList(){ o};
        }
        o.SetActive(false);
        return o;
    }
}