unity 多图集ab加载获取其中的sprite

这玩意简单 直接上脚本蛤：

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

public class SpriteManager 
{
    private static  Dictionary<string, Object[]> m_pAtlasDic= new Dictionary<string, Object[]>();//图集的集合  
   
    //加载图集上的一个精灵  
    public static Sprite LoadAtlasSprite(string _spriteAtlasPath, string _spriteName)
    {
        Sprite _sprite = FindSpriteFormBuffer(_spriteAtlasPath, _spriteName);
        if (_sprite == null)
        {
            AssetBundle modelAb = GameManager.Instance.abLoadManger.Load_assetBundle("item.unity3d");
            Object[] _atlas = modelAb.LoadAllAssets();// Resources.LoadAll(_spriteAtlasPath);
            m_pAtlasDic.Add(_spriteAtlasPath, _atlas);
            _sprite = SpriteFormAtlas(_atlas, _spriteName);
        }
        return _sprite;
    }
    //删除图集缓存  
    public static void DeleteAtlas(string _spriteAtlasPath)
    {
        if (m_pAtlasDic.ContainsKey(_sprit