cocos2d-x lua 示例Demo
具体代码：
新建之后，你首先看到的main.lua启动到MyApp.lua。
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require("app.MyApp"):create():run()
看MyApp.lua文件：
1、require("app.MyApp")
这里执行的MyApp.lua的代码是：
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local MyApp = class("MyApp", cc.load("mvc").AppBase) -- 继承cc.mvc.AppBase
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function MyApp:onCreate()
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math.randomseed(os.time())
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end
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return MyApp
MyApp.create()执行后，执行的代码是：
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function MyApp:ctor()
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MyApp.super.ctor(self)
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end
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cls.new = function(...)
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local instance
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if cls.__create then
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instance = cls.__create(...)
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else
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instance = {}
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end
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setmetatableindex(instance, cls)
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instance.class = cls
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instance:ctor(...)
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return instance
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end
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cls.create = function(_, ...)
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return cls.new(...)
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end
可以看到，在class的实现方法里面，给每个创建的类声明了一个new()方法，方法里面调用了ctor()构造方法（ctor只是个名字，所以不是有些人认为的create了之后，当然会调用构造方法，lua没有类，只是我们模仿了类）
3.require("app.MyApp").create():run()
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function AppBase:run(initSceneName)
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initSceneName = initSceneName or self.configs_.defaultSceneName
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self:enterScene(initSceneName)
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end
其实：self.configs_.defaultSceneName = “MainScene”，就是进入初始界面。
对于MyApp.lua文件，如果我修改成下面的样子，是不是你就理解了上面所做的事情：
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local AppBase = class("AppBase")
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-- 初始化调用
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function AppBase:ctor(configs)
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self.configs_ = {
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viewsRoot = "app.views",
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modelsRoot = "app.models",
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defaultSceneName = "MainScene",
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}
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for k, v in pairs(configs or {}) do
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self.configs_[k] = v
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end
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if type(self.configs_.viewsRoot) ~= "table" then
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self.configs_.viewsRoot = {self.configs_.viewsRoot}
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end
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if type(self.configs_.modelsRoot) ~= "table" then
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self.configs_.modelsRoot = {self.configs_.modelsRoot}
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end
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if DEBUG > 1 then
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dump(self.configs_, "AppBase configs")
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end
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if CC_SHOW_FPS then
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cc.Director:getInstance():setDisplayStats(true)
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end
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-- event
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self:onCreate()
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end
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-- 运行场景
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function AppBase:run(initSceneName)
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initSceneName = initSceneName or self.configs_.defaultSceneName
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self:enterScene(initSceneName)
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end
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-- 选择场景
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function AppBase:enterScene(sceneName, transition, time, more)
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local view = self:createView(sceneName)
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view:showWithScene(transition, time, more)
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return view
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end
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-- 选择UI，即是view
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function AppBase:createView(name)
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for _, root in ipairs(self.configs_.viewsRoot) do
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local packageName = string.format("%s.%s", root, name)
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local status, view = xpcall(function()
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return require(packageName)
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end, function(msg)
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if not string.find(msg, string.format("'%s' not found:", packageName)) then
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print("load view error: ", msg)
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end
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end)
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local t = type(view)
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if status and (t == "table" or t == "userdata") then
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return view:create(self, name)
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end
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end
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error(string.format("AppBase:createView() - not found view "%s" in search paths "%s"",
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name, table.concat(self.configs_.viewsRoot, ",")), 0)
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end
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-- 创建时调用
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function AppBase:onCreate()
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end
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return AppBase
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local MainScene = class("MainScene", cc.load("mvc").ViewBase)
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function MainScene:onCreate()
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-- add background image
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display.newSprite("MainSceneBg.jpg")
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:move(display.center)
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:addTo(self)
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-- add play button
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local playButton = cc.MenuItemImage:create("PlayButton.png", "PlayButton.png")
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:onClicked(function()
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self:getApp():enterScene("PlayScene") -- 进入游戏界面
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end)
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cc.Menu:create(playButton)
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:move(display.cx, display.cy - 200)
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:addTo(self)
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end
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return MainScene