Unity性能优化 对象延迟创建

///by邓陶然

using UnityEngine;public class LaterCreator : MonoBehaviour{public delegate GameObject CreatorCallBack();public CreatorCallBack _creatorCallBack;public System.Object CallBackObj;    /// <summary>    /// 获取已创建成功的对象。    /// </summary>    public GameObject CreatedGameObject { get; private set; }    private bool allreadyCreator;    private UIWidget uiw;public UIPanel panel;    public bool alwaysShow;    private void Start (){if(panel == null){panel = GetComponentInParent<UIPanel>();}}    /// <summary>    /// 设置单元大小    /// </summary>    /// <param name="size"></param>public void SetSize(Vector3 size){uiw = gameObject.AddComponent<UIWidget>();uiw.SetRect(0,0,size.x,size.y);// Update();}private void OnEnable(){if(panel == null){panel = GetComponentInParent<UIPanel>();}}private void Update (){if(IsInView()){if(allreadyCreator && CreatedGameObject != null){CreatedGameObject.SetActive(true);}else{if(_creatorCallBack != null && !allreadyCreator){                    CreatedGameObject = _creatorCallBack();                    allreadyCreator = true; }}}else{if(allreadyCreator && CreatedGameObject != null){                if (alwaysShow)   {                    CreatedGameObject.SetActive(true);   }   else   {                    CreatedGameObject.SetActive(false);   }}}}    public void Reflush(){Update();}    /// <summary>    /// 强制创建或使对象可见    /// </summary>public void ForceOpen(){if(allreadyCreator && CreatedGameObject != null){CreatedGameObject.SetActive(true);}else{if(_creatorCallBack != null && !allreadyCreator){CreatedGameObject = _creatorCallBack();allreadyCreator = true;}}}    /// <summary>    /// 是否在视图中可见    /// </summary>    /// <returns></returns>    private bool IsInView()    {        if (panel == null)        {            return false;        }        return panel.IsVisible(uiw);    }}