How to implement this pattern in Lua with Cocos2d-x - lua

Question

I wanna call GameScene setSpecificSquare function in Square, it will occur 'attempt to index field 'squares' error.
In my understanding, require("GameScene") in onTouchEnded(touch event) do not get the last variable of GameScene, it has not been constructed, so it does not have squares attribute.
How to call GameScene static function setSpecificSquare in Square? Or in other word, how to get the last GameScene so I can set self.squares table?
Thanks in advanced!! :)
Square.lua
require "Cocos2d"
require "Cocos2dConstants"
local Square = class("Square",function()
return cc.Node:create()
end)
function Square.create()
local square = Square.new()
return square
end
function Square:ctor()
self.bg = cc.Sprite:create("square_bg.png")
self:addChild(self.bg)
self.isHighlight = true
local function onTouchEnded(touch,event)
--occur error here
require("GameScene"):setSpecificSquare()
end
end
return Square
GameScene.lua
require "Cocos2d"
require "Cocos2dConstants"
local GameScene = class("GameScene",function()
return cc.Scene:create()
end)
function GameScene.create()
local scene = GameScene.new()
return scene
end
function GameScene:ctor()
self.visibleSize = cc.Director:getInstance():getVisibleSize()
self.x = cc.Director:getInstance():getVisibleOrigin().x
self.y = cc.Director:getInstance():getVisibleOrigin().y
self.squares = {}
for i=0, 5 do
self.squares[i] = {} -- create a new row
for j=0, 5 do
self.squares[i][j] = nil
end
end
--add layer
self.bombLayer = cc.Layer:create()
self:addChild(self.bombLayer)
--add squares
self:addSquares()
end
function GameScene:addSquares()
for i=0,5 do
for j=0,5 do
local square = require("src/Square"):create()
square:setPosition(0+j*70,0+i*70)
self.bombLayer:addChild(square)
self.squares[i][j] = square
end
end
end
function GameScene:setSpecificSquare()
--can not access self.square here, occur attempt to index field 'squares' error
self.square[0][0].isHighLight
end
return GameScene

Answer 1

Move self.squares = {} out of ctor function, or call ctor function before calling addSquares, or you can just call this function inside addsquares.
The recommended method is moving it out of function and creating it on creation of your GameScene object:
require "Cocos2d"
require "Cocos2dConstants"
local GameScene = class("GameScene",function()
return cc.Scene:create()
end)
function GameScene.create()
local scene = GameScene.new()
return scene
end
GameScene.squares = {}
...