為了節省記憶體,避免同種物體的反覆生成銷燬,衍生了物件池的概念
  物件池實現的簡單示例如下:

程式碼如下:

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

public class ObjectPool : MonoBehaviour
{
    //monster的預製體
    public GameObject MonsterPrefab;
    //monster的物件池
    private Stack<GameObject> monsterPool;
 

    //在當前場景中正在使用的  啟用的monster
    private Stack<GameObject> activeMonsterPool;

    void Start()
    {
        monsterPool = new Stack<GameObject>();
        activeMonsterPool = new Stack<GameObject>();
    }
    void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            //獲取一個monster物件
 

            GameObject monster = GetMonster();
            monster.transform.position = new Vector3(Random.Range(-8,8),Random.Range(-3,4),0);
            activeMonsterPool.Push(monster);
        }
        if (Input.GetMouseButtonDown(1))
        {
            if (activeMonsterPool.Count > 0)
            {
 

                PushGameObjectToPool(activeMonsterPool.Pop());
            }
        }
    }
    private GameObject GetMonster()
    {
        GameObject monsterTemp = null;
        if (monsterPool.Count > 0)
        {
            //池子中有物件
            monsterTemp = monsterPool.Pop();
            monsterTemp.SetActive(true);
        }
        else
        {
            //物件池中沒有物件 去例項化
            monsterTemp = Instantiate(MonsterPrefab);
        }
        return monsterTemp;
    }
    // 把一個monster物件推進物件池
    private void PushGameObjectToPool(GameObject monster)
    {
        monster.transform.SetParent(transform);
        monster.SetActive(false);
        monsterPool.Push(monster);
    }
}