SLua-Lua调用自定义C#类

在Lua中通过Resources.load加载一个图片只能得到testure2D，而我们使用UGUI想改变Image的图片的时候需要的是Sprite图片，这时我们在C#中定义一个Resouce加载的类使用范型加载Sprite图片，在Lua中调用这个类。

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using SLua;
using System.IO;
using System;

[CustomLuaClass]
public class CustomTest : MonoBehaviour {
    LuaSvr luaSvr;
    static CustomTest c;
    // Use this for initialization
    void Start () {
        c = this;
        luaSvr = new LuaSvr();
        luaSvr.init(null, () =>
         {
             LuaState.main.loaderDelegate += LuaLoader;
             luaSvr.start("mycustom");
         });

    }
    
    // Update is called once per frame
    void Update () {
        
    }

    [MonoPInvokeCallbackAttribute(typeof(LuaCSFunction))]
    [StaticExport]
    static public int StaticCustom(IntPtr l)
    {
        LuaObject.pushValue(l, true);
        LuaDLL.lua_pushstring(l, "Tom Cat");
        LuaObject.pushObject(l, c);
        return 3;
    }

    [MonoPInvokeCallbackAttribute(typeof(LuaCSFunction))]
    static public int InstanceCustom(IntPtr l)
    {
        CustomTest self = (CustomTest)LuaObject.checkSelf(l);
        LuaObject.pushValue(l, true);
        LuaDLL.lua_pushstring(l, "Jerry m");
        LuaDLL.lua_pushinteger(l, 6);
        return 3;
    }

    public Sprite GetSprite(string path)
    {
        return Resources.Load(path);
    }
    private byte[] LuaLoader(string fn, ref string absoluteFn)
    {
        string newFn = fn.Replace(".", "/");
        string path = Application.dataPath + "/Slua/Resources/" + newFn + ".lua";
        byte[] data = null;
        if (File.Exists(path))
        {
            data = File.ReadAllBytes(path);
        }
        else
        {
            TextAsset txt = Resources.Load(newFn);
        }
        return data;
    }
}

Lua

function main()
    local s,c = CustomTest.StaticCustom()
    local a,b = c:InstanceCustom()
    print(c:GetSprite("trophy2")) 
    print(a,b)
end