1、游戲從main文件開始

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Application::getInstance()->run() 啟動游戲

2、AppDelegate.h 游戲生命周期

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四個純虛構函數(shù)

（1）applicationDidFinishLaunching 正在運行

   bool AppDelegate::applicationDidFinishLaunching() {
    // initialize director
    // 初始化 director
    // auto C++ 11 自動類型識別，類似java中的object，typeid(director).name() 能輸出類型
    auto director = Director::getInstance();
    auto glview = director->getOpenGLView();
    if(!glview) {
    #if (CC_TARGET_PLATFORM == CC_PLATFORM_WIN32) || (CC_TARGET_PLATFORM == CC_PLATFORM_MAC)     || (CC_TARGET_PLATFORM == CC_PLATFORM_LINUX)
        glview = GLViewImpl::createWithRect("GameDemo1", cocos2d::Rect(0, 0, designResolutionSize.width,         designResolutionSize.height));
    #else
        glview = GLViewImpl::create("GameDemo1");
    #endif
        director->setOpenGLView(glview);
    }

    // 設置是否顯示fps幀數(shù)
    director->setDisplayStats(true);

    // 1秒60fps
    director->setAnimationInterval(1.0f / 60);

    // Set the design resolution
    glview->setDesignResolutionSize(designResolutionSize.width, designResolutionSize.height, ResolutionPolicy::NO_BORDER);
    auto frameSize = glview->getFrameSize();
    // if the frame's height is larger than the height of medium size.
    if (frameSize.height > mediumResolutionSize.height)
    {        
        director->setContentScaleFactor(MIN(largeResolutionSize.height/designResolutionSize.height, largeResolutionSize.width/designResolutionSize.width));
    }
    // if the frame's height is larger than the height of small size.
    else if (frameSize.height > smallResolutionSize.height)
    {        
        director->setContentScaleFactor(MIN(mediumResolutionSize.height/designResolutionSize.height, mediumResolutionSize.width/designResolutionSize.width));
    }
    // if the frame's height is smaller than the height of medium size.
    else
    {        
        director->setContentScaleFactor(MIN(smallResolutionSize.height/designResolutionSize.height, smallResolutionSize.width/designResolutionSize.width));
    }

    register_all_packages();

    // 創(chuàng)建一個場景
    // create a scene. it's an autorelease object
    auto scene = HelloWorld::createScene();

    // 運行場景
    director->runWithScene(scene);

return true;
}

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applicationDidEnterBackground 進入后臺

applicationWillEnterForeground 從后臺切換至前臺