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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1.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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1.local MyApp = class("MyApp", cc.load("mvc").AppBase) -- 继承cc.mvc.AppBase

2. 

3.function MyApp:onCreate()

4.math.randomseed(os.time())

5.end

6. 

7.return MyApp

2、require("app.MyApp").create()
MyApp.create()执行后，执行的代码是：

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1.function MyApp:ctor()

2.MyApp.super.ctor(self)

3.end

为什么create()了之后会执行MyApp:ctor()？请看function.lua下的function class(classname, super)方法：

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01.cls.new = function(...)

02.local instance

03.if cls.__create then

04.instance = cls.__create(...)

05.else

06.instance = {}

07.end

08.setmetatableindex(instance, cls)

09.instance.class = cls

10.instance:ctor(...)

11.return instance

12.end

13.cls.create = function(_, ...)

14.return cls.new(...)

15.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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1.function AppBase:run(initSceneName)

2.initSceneName = initSceneName or self.configs_.defaultSceneName

3.self:enterScene(initSceneName)

4.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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01.local AppBase = class("AppBase")

02. 

03.-- 初始化调用

04.function AppBase:ctor(configs)

05.self.configs_ = {

06.viewsRoot  = "app.views",

07.modelsRoot = "app.models",

08.defaultSceneName = "MainScene",

09.}

10. 

11.for k, v in pairs(configs or {}) do

12.self.configs_[k] = v

13.end

14. 

15.if type(self.configs_.viewsRoot) ~= "table" then

16.self.configs_.viewsRoot = {self.configs_.viewsRoot}

17.end

18.if type(self.configs_.modelsRoot) ~= "table" then

19.self.configs_.modelsRoot = {self.configs_.modelsRoot}

20.end

21. 

22.if DEBUG > 1 then

23.dump(self.configs_, "AppBase configs")

24.end

25. 

26.if CC_SHOW_FPS then

27.cc.Director:getInstance():setDisplayStats(true)

28.end

29. 

30.-- event

31.self:onCreate()

32.end

33. 

34.-- 运行场景

35.function AppBase:run(initSceneName)

36.initSceneName = initSceneName or self.configs_.defaultSceneName

37.self:enterScene(initSceneName)

38.end

39. 

40.-- 选择场景

41.function AppBase:enterScene(sceneName, transition, time, more)

42.local view = self:createView(sceneName)

43.view:showWithScene(transition, time, more)

44.return view

45.end

46. 

47.-- 选择UI，即是view

48.function AppBase:createView(name)

49.for _, root in ipairs(self.configs_.viewsRoot) do

50.local packageName = string.format("%s.%s", root, name)

51.local status, view = xpcall(function()

52.return require(packageName)

53.end, function(msg)

54.if not string.find(msg, string.format("'%s' not found:", packageName)) then

55.print("load view error: ", msg)

56.end

57.end)

58.local t = type(view)

59.if status and (t == "table" or t == "userdata") then

60.return view:create(self, name)

61.end

62.end

63.error(string.format("AppBase:createView() - not found view "%s" in search paths "%s"",

64.name, table.concat(self.configs_.viewsRoot, ",")), 0)

65.end

66. 

67.-- 创建时调用

68.function AppBase:onCreate()

69.end

70. 

71.return AppBase

MainScene.lua

 

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01.local MainScene = class("MainScene", cc.load("mvc").ViewBase)

02. 

03.function MainScene:onCreate()

04.-- add background image

05.display.newSprite("MainSceneBg.jpg")

06.:move(display.center)

07.:addTo(self)

08. 

09.-- add play button

10.local playButton = cc.MenuItemImage:create("PlayButton.png", "PlayButton.png")

11.:onClicked(function()

12.self:getApp():enterScene("PlayScene")   -- 进入游戏界面

13.end)

14.cc.Menu:create(playButton)

15.:move(display.cx, display.cy - 200)

16.:addTo(self)

17.end

18. 

19.return MainScene