tolua注册对象到lua，并在lua中调用的实现

本文基于tolua里C#与lua互调，在此基础上添加了对象的注册。具体看代码：

using System;
using UnityEngine;
using UnityEditor;
using LuaInterface;

public class LuaBehaviour : MonoBehaviour
{
    public string LuaFullPath;
    public string LuaName;
    private LuaState m_Lua;

    private int m_ClassRef = -1;//the lua class ref
    private int m_BindLuaRef = -1;//the lua class bind class ref
    private int m_StartRef = -1;//the 'Start' function of lua
    private int m_OnDestroyRef = -1;// the 'OnDestroy' function of lua

    public GameObject tempObj;

    public LuaBehaviour()
    {

    }
    void Awake()
    {
        m_Lua = LuaInstance.Instance.LuaState;

        if (!m_Lua.LuaDoFile(GameConfig.LuaPath + LuaFullPath))
        {
            Debug.LogError("load file failed, file name is " + LuaName);
        }

        m_Lua.LuaNewTable();
        m_Lua.LuaPushValue(-1);
        m_BindLuaRef = m_Lua.ToLuaRef();
        m_Lua.LuaRawSetI(LuaIndexes.LUA_REGISTRYINDEX, m_BindLuaRef);

        m_Lua.LuaGetGlobal(LuaName);
        m_ClassRef = m_Lua.ToLuaRef();
        if (m_ClassRef == LuaDLL.LUA_REFNIL)
        {
            Debug.LogError("not find the ref object");
        }
        m_Lua.LuaGetGlobal(LuaName);
        m_Lua.LuaRawSetI(LuaIndexes.LUA_REGISTRYINDEX, m_ClassRef);

        m_Lua.LuaRawGetI(LuaIndexes.LUA_REGISTRYINDEX, m_ClassRef);
        m_Lua.LuaRawGetI(LuaIndexes.LUA_REGISTRYINDEX, m_BindLuaRef);
        m_Lua.LuaSetMetaTable(-2);

        m_Lua.LuaGetGlobal(LuaName);

        m_Lua.LuaGetField(-1, "Start");
        m_StartRef = m_Lua.ToLuaRef();
        if (m_StartRef == LuaDLL.LUA_REFNIL)
        {
            Debug.LogError("not find the ref object");
        }
        m_Lua.LuaGetField(-1, "Start");
        m_Lua.LuaRawSetI(LuaIndexes.LUA_REGISTRYINDEX, m_StartRef);

        m_Lua.LuaGetField(-1, "OnDestroy");
        m_OnDestroyRef = m_Lua.ToLuaRef();
        if (m_OnDestroyRef == LuaDLL.LUA_REFNIL)
        {
            Debug.LogError("not find the ref object");
        }
        m_Lua.LuaGetField(-1, "OnDestroy");
        m_Lua.LuaRawSetI(LuaIndexes.LUA_REGISTRYINDEX, m_OnDestroyRef);
        RegisterParams();
    }

    void Start()
    {
        m_Lua.LuaRawGetI(LuaIndexes.LUA_REGISTRYINDEX, m_StartRef);
        m_Lua.LuaRawGetI(LuaIndexes.LUA_REGISTRYINDEX, m_ClassRef);
        m_Lua.PCall(1, 0);
        m_Lua.LuaPop(1);
    }

    void OnDestroy()
    {
        m_Lua.LuaRawGetI(LuaIndexes.LUA_REGISTRYINDEX, m_OnDestroyRef);
        m_Lua.PCall(0, 0);
        m_Lua.LuaPop(1);
    }

    private void RegisterParams()
    {
        m_Lua.LuaRawGetI(LuaIndexes.LUA_REGISTRYINDEX, m_ClassRef);
        m_Lua.PushObject(tempObj);
        m_Lua.LuaSetField(-2, "tempObj");
    }
}

在上一篇的基础上，我添加了一个LuaInstance类用于管理LuaState的使用，使用RegisterParam方法将C#中的对象注册到lua，并在lua中调用。本功能主要是解决NGUI对象的动态添加问题，比方，以后游戏上线后，可能会在预制体中添加个label，但是我们不能更新C#，所以只能通过动态注册到lua中。

lua中的使用

--Created By: xikuo yu
--Time: 2016-12-24

FirstLua = {}
setmetatable(FirstLua,{})
function FirstLua:Start()
	print("FirstLua Start")
	if self.tempObj ~= nil then
		print("tempObj is not nil")
		print( self.tempObj.tag )
		self.tempObj:SetActive(false);

	else
		print("tempObj is nil")
	end
end

function FirstLua:OnDestroy()
	print("FirstLua OnDestroy")
end

function FirstLua.Function1()
	if self == nil then
		print("FirstLua Function1 self is nil")
	else
		print("FirstLua Function1")
	end
end

function Function2()
	print("Function2")
end

关于调用：

tolua为我们将类的属性添加了get与set，在lua中使用时，通过点操作符，获取C#注册过来的对象，使用分号操作符，获取C#中Wraper文件中注册的方法。

以后可能打算用反射的方式来添加方法的注册，使热更新做的更彻底，缺点是性能会有损失。

结果：