对象池的作用

避免一直重复的创建和销毁某个对象，增加消耗

理解

就是在开辟一个地方，去储存会大量实例化和销毁的对象（最典型的就是FPS游戏里面的子弹），对象池就是给这些实例化的对象有个地方住着，而不是因为无家可归就被鲨了，当下次再需要的时候就可以直接利用而不是需要再生一个（毕竟生孩子需要很大的消耗哈哈哈哈o(*≧▽≦)ツ┏━┓）。

对象池最少需要两个功能

1.获取对象
2.回收对象

不说废话上代码

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

public class ObjPool : MonoBehaviour
{
    // Use this for initialization
    public static ObjPool _instance;
    private Dictionary<string, List<GameObject>> _pool = new Dictionary<string, List<GameObject>>();
    private Dictionary<string, GameObject> _prefab = new Dictionary<string, GameObject>();
    void Awake()
    {
        _instance = this;
    }
    // Update is called once per frame
    void Update()
    {
    }
    /// <summary>
    /// 在对象池获取对象
    /// </summary>
    /// <param name="objName">对象名称</param>
    /// <returns></returns>
    public GameObject GetObj(string objName)
    {
        GameObject result = null;
        if (_pool.ContainsKey(objName))
        {
            if (_pool[objName].Count > 0)
            {
                result = _pool[objName][0];
                result.SetActive(true);
                _pool[objName].Remove(result);
                return result;
            }
        }
        GameObject prefab = null;
        if (_prefab.ContainsKey(objName))
        {
            prefab = _prefab[objName];
        }
        else
        {
            prefab = Resources.Load<GameObject>("Prefabs/" + objName);
            _prefab.Add(objName, prefab);
        }
        result = Instantiate(prefab);
        result.name = objName;
        return result;
    }
    /// <summary>
    /// 回收到对象池
    /// </summary>
    /// <param name="obj"></param>
    public void RecycleObj(GameObject obj)
    {
        obj.SetActive(false);
        if (_pool.ContainsKey(obj.name))
        {
            _pool[obj.name].Add(obj);
        }
        else
        {
            _pool.Add(obj.name, new List<GameObject> { obj });
        }
    }
}

测试一哈

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

public class TestObjPool : MonoBehaviour {

    public GameObject[] gameObjects=new GameObject[10];
    public void Start()
    {
        for (int i = 0; i < 10; i++)
        {
            gameObjects[i]=ObjPool._instance.GetObj("Obj");
        }

        for (int i = 0; i < 5; i++)
        {
            ObjPool._instance.RecycleObj(gameObjects[i]);
        }
    }
    
}