unity对象池

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参考另一篇

避免了重复创建对象，而将对象放入一个List中（池里面），获取显示隐藏等方法来处理，提高执行效率

大概截图：类似捕鱼达人的demo

1 创建脚本，旋转大炮，按钮按下，调用对象池开始操作创建对象，显示隐藏对象

using UnityEngine;using System.Collections;public class SpawnFire : MonoBehaviour {    public float time = 0;// Use this for initializationvoid Start () {}// Update is called once per framevoid Update () {        time -= Time.deltaTime;        if (time < 0) {            time = 0.1f;            Vector3 mousepos = Input.mousePosition;            mousepos = Camera.main.ScreenToWorldPoint(mousepos);  //鼠标按下的坐标            Vector3 ownPos = this.transform.position; // 大炮的位置            if (Input.GetMouseButton(0)) {                Vector3 angelV = mousepos - ownPos;                float angele = Vector2.Angle(angelV,Vector3.up);  //  一直正的,二维向量夹角                //Debug.Log(angele);                if (mousepos.x > ownPos.x)                    angele = -angele;                this.transform.eulerAngles = new Vector3(0,0,angele);                GameObject go = (GameObject)Resources.Load("fire");//  创建               // Fire.CreateFire(go, this.transform.TransformPoint(0,1,0),new Vector3(0, 0, angele));               FishPool._instance.CreateObj(go,this.transform.TransformPoint(0,1,0),new Vector3(0,0,angele));// 将位置角度传入对象池脚本            }                  }}}

2 对象池脚本，如果list为空，这创建gameobject，等子弹消失后，Add进list，同时将对象active设置成false，如果list不为空，取出ist的第一个元素，remove出list，同时将对象active设置成true

using UnityEngine;using System.Collections;using System.Collections.Generic;public class FishPool : MonoBehaviour{    // Use this for initialization    public static FishPool _instance;    public List<GameObject> list=new List<GameObject>();    int a = 0;    private void Awake()    {        _instance = this;    }    void Start () {}    public static FishPool GetInstance() {        if (_instance == null)            _instance = new FishPool();        return _instance;    }// Update is called once per framevoid Update () {}    public void CreateObj(GameObject prefab,Vector3 pos,Vector3 angel) {                     if (list.Count == 0)        {            GameObject go = (GameObject)Instantiate(prefab, pos, Quaternion.Euler(angel));            go.name = "--------------";            go.AddComponent<Fire>();            StartCoroutine(Fly(go));        }        else        {            Debug.Log("list cout "+list.Count);            GameObject go = list[0];            go.active = true;            go.transform.position = pos;            go.transform.eulerAngles = angel;            list.Remove(go);            StartCoroutine(Fly(go));        }    }    IEnumerator Fly(GameObject go)    {        yield return new WaitForSeconds(1f);        go.active = false;        list.Add(go);    }}

最后绑定在子弹上的移动脚本，其实文章开头连接文章是将显示隐藏放在子弹的脚本里面，然后在对象池的脚本对外开放一个方法，让外面来操作里面的list，这个比较好

void Update () {        this.transform.Translate(new Vector3(0,Time.deltaTime*speed,0));}

BUG再现，警示作用

结合单例模式

using UnityEngine;using System.Collections;using System.Collections.Generic;public class FishPool : MonoBehaviour{    // Use this for initialization    public static FishPool _instance;    public List<GameObject> list=new List<GameObject>();    int a = 0;    private void Awake()    {        _instance = this;    }    void Start () {}    public static FishPool GetInstance() {        Debug.Log("hehe");        if (_instance == null)            _instance = new FishPool();        Debug.Log("haha");        return _instance;    }// Update is called once per framevoid Update () {}    public void CreateObj() {              Debug.Log("a "+a++);            }}

FishPool._instance.CreateObj());
类继承MonoBehaviour，但是这个类没有绑到物体上，那么由于没有绑到物体，Awake就不会执行，需要手动创建返回静态对象的方法，然后就是继承MonoBehavior后，导致单例模式失效，该情况下每次都会实例化一个instance ，Debug语句会一直是0

类继承MonoBehaviour，但是这个类有绑到物体上，单例模式正常，a会一累加，同时可以在Awake中初始化

类不继承Monobehaviour，单例模式正常，a会一累加

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