自定义泛型对象池

封装泛型类

public abstract class MyPool<T> : MonoBehaviour where T :Component
{
    [SerializeField] protected T prefab; // 生成的预制体
    [SerializeField] protected int defaultNum; // 池子的大小
    protected Queue<T> pool = new Queue<T>(); // 队列存储池子

    protected bool IsPoolEmpty() => pool.Count == 0;
    protected bool IsPoolFull() => pool.Count > prefab;
	
	// 对象池四件套
    protected virtual T OnCreateItem() => Instantiate(prefab, transform);
    protected virtual void OnGetItem(T obj) => obj.gameObject.SetActive(true);
    protected virtual void OnReleaseItem(T obj) => obj.gameObject.SetActive(false);
    protected virtual void OnDestroy(T obj) => Destroy(obj.gameObject);
	
	// 用来获得对象后初始化一些信息
    protected abstract void InitializedObj(T obj); 
    protected T Get()
    {
        T obj;
        if (IsPoolEmpty()) obj = OnCreateItem();
        else
        {
            obj = pool.Dequeue();
            OnGetItem(obj);
        }

        InitializedObj(obj);
        return obj;
    }

    protected void Release(T obj)
    {
        if (IsPoolFull()) OnDestroy(obj);
        else
        {
            pool.Enqueue(obj);
            OnReleaseItem(obj);
        }
    }

}

例子

BoxPool：

public class BoxPool : MyPool<Box> 
{
    public float IntervalTime = 0.1f;
    void Start()
    {
        StartCoroutine(ContinueCreateBox());
    }
	
	// 不断生成对象
    private IEnumerator ContinueCreateBox()
    {
        while (true)
        {
            Box box = Get(); // 获得出来使用
            yield return new WaitForSeconds(IntervalTime);
        }
    }
	
	// 重写创建对象方法，添加委托
    protected override Box OnCreateItem()
    {
        Box box = base.OnCreateItem();
        box.SetBackDestroy(() => {
            Release(box);
        });
        return box;
    }
	
	// 完成抽象方法，初始化信息
    protected override void InitializedObj(Box obj)
    {
        obj.transform.position = transform.position + Random.insideUnitSphere * 2f; // 半径2内随机 
        obj.transform.rotation = Quaternion.identity;
        obj.GetComponent<Rigidbody>().velocity = Vector3.zero; // 重置刚体速度，否则会越掉越快
    }

}

Box：

public class Box : MonoBehaviour
{
    public UnityAction backDestroy;

    private float intervalTime = 1.5f;
    private float nowTime;

    private void Update() 
    {
        nowTime += Time.deltaTime;
        if (nowTime > intervalTime)
        {
            nowTime = 0;
            backDestroy?.Invoke();
        }
    }

    public void SetBackDestroy(UnityAction back)
    {
        backDestroy = back;
    }
}

使用Unity自带对象池