UGUI图集管理

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 //纹理图集加载管理
 public class PPTextureManage : MonoBehaviour {
     private static GameObject m_pMainObject;
     private static PPTextureManage m_pContainer = null;
     public static PPTextureManage getInstance(){
         if(m_pContainer == null){
             m_pContainer = m_pMainObject.GetComponent<PPTextureManage> ();
         }
         return m_pContainer;
     }
     private Dictionary<string, Object[]> m_pAtlasDic;//图集的集合
     void Awake(){
         initData ();
     }
     private void initData(){
         PPTextureManage.m_pMainObject = gameObject;
         m_pAtlasDic = new Dictionary<string, Object[]> ();
     }
     // Use this for initialization
     void Start () {
     }
     //加载图集上的一个精灵
     public Sprite LoadAtlasSprite(string _spriteAtlasPath,string _spriteName){
         Sprite _sprite = FindSpriteFormBuffer (_spriteAtlasPath,_spriteName);
         if (_sprite == null) {
             Object[] _atlas = Resources.LoadAll (_spriteAtlasPath);
             m_pAtlasDic.Add (_spriteAtlasPath,_atlas);
             _sprite = SpriteFormAtlas (_atlas,_spriteName);
         }
         return _sprite;
     }
     //删除图集缓存
     public void DeleteAtlas(string _spriteAtlasPath){
         if (m_pAtlasDic.ContainsKey (_spriteAtlasPath)) {
             m_pAtlasDic.Remove (_spriteAtlasPath);
         }
     }
     //从缓存中查找图集，并找出sprite
     private Sprite FindSpriteFormBuffer(string _spriteAtlasPath,string _spriteName){
         if (m_pAtlasDic.ContainsKey (_spriteAtlasPath)) {
             Object[] _atlas = m_pAtlasDic[_spriteAtlasPath];
             Sprite _sprite = SpriteFormAtlas(_atlas,_spriteName);
             return _sprite;
         }
         return null;
     }
     //从图集中，并找出sprite
     private Sprite SpriteFormAtlas(Object[] _atlas,string _spriteName){
         for (int i = ; i < _atlas.Length; i++) {
             if (_atlas [i].GetType () == typeof(UnityEngine.Sprite)) {
                 if(_atlas [i].name == _spriteName){
                     return (Sprite)_atlas [i];
                 }
             }
         }
         Debug.LogWarning ("图片名:"+_spriteName+";在图集中找不到");
         return null;
     }
 }