TexturepackerGUI&Unity3d native2d Sprite

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TexturepackerGUI生成的图集如何在Unity3d里边用native 2d sprite显示切好的小图
a.解析Texturepacker的json用的是Litjson这个库
b.Texturepacker导出图集的时候不能用旋转(因为unity3d支持:(
上码:
using UnityEngine;using System.Collections;using System.Collections.Generic;using System.IO;using UnityEditor;using LitJson;public class EAtlasBuild  {    public class ERect     {        public int x, y;        public int w, h;        public ERect(JsonData jsonData)         {            x = (int)jsonData["x"];            y = (int)jsonData["y"];            w = (int)jsonData["w"];            h = (int)jsonData["h"];        }    }    public class ESpriteData     {        public string m_strName = "";        public ERect frame;        public bool rotated = false;        public bool trimmed = false;        public ERect spriteSourceSize;        public int sourceWidth;        public int sourceHeight;        public ESpriteData(JsonData jsonData,string _name)        {            m_strName = _name;            frame = new ERect(jsonData["frame"]);            rotated = (bool)jsonData["rotated"];            trimmed = (bool)jsonData["trimmed"];            spriteSourceSize = new ERect(jsonData["spriteSourceSize"]);            JsonData sourceSize = jsonData["sourceSize"];            sourceWidth = (int)sourceSize["w"];            sourceHeight = (int)sourceSize["h"];        }    }    [MenuItem("Custom/SetAtlas")]    static public void SetAtlas()     {        string atlasPath = Application.dataPath + "/_Atlas/UI/UI.png";        string atlasTxtPath = Application.dataPath + "/_Atlas/UI/UI.txt";        string jsonStr = File.ReadAllText(atlasTxtPath);        JsonData frames = JsonMapper.ToObject(jsonStr)["frames"];        IDictionary dict = frames as IDictionary;        List<ESpriteData> lstSprite = new List<ESpriteData>();                foreach (string key in dict.Keys)         {            string fileName = key;            ESpriteData sprite = new ESpriteData(frames[fileName], fileName);            lstSprite.Add(sprite);        }        Debug.Log("count:" + lstSprite.Count);        string atlasAssetsPath = atlasPath.Substring(atlasPath.IndexOf("Assets"));        TextureImporter textureImporter = AssetImporter.GetAtPath(atlasAssetsPath) as TextureImporter;        if (textureImporter != null)         {            Texture2D texture2d = Resources.LoadAssetAtPath<Texture2D>(atlasAssetsPath);            int width = texture2d.width;            int height = texture2d.height;                        SpriteMetaData[] sprites = new SpriteMetaData[lstSprite.Count];            for (int i = 0; i < lstSprite.Count; i++)             {                ESpriteData spriteData = lstSprite[i];                ERect frame = spriteData.frame;                sprites[i] = new SpriteMetaData();                sprites[i].name = spriteData.m_strName;                sprites[i].pivot = new Vector2(0.5f, 0.5f);                sprites[i].rect = new Rect(                    frame.x,                     height - frame.y - frame.h,                     frame.w, frame.h);            }            Debug.Log("XD");            textureImporter.textureType = TextureImporterType.Sprite;            textureImporter.spriteImportMode = SpriteImportMode.Multiple;            textureImporter.spritesheet = sprites;            textureImporter.spritePixelsToUnits = 100;            textureImporter.filterMode = FilterMode.Point;            TextureImporterSettings tipSeting = new TextureImporterSettings();            textureImporter.ReadTextureSettings(tipSeting);            textureImporter.SetTextureSettings(tipSeting);            AssetDatabase.ImportAsset(atlasAssetsPath);        }    }}
效果图:
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