class LifeCircleLog 
{
 std::string m_msg;
public:
  LifeCircleLog  (){};
  LifeCircleLog  (const string& msg):m_msg(msg)
 {
  CCLog("%s BEGINS!",m_msg.c_str());
 }
 ~ LifeCircleLog  ()
 {
  CCLog("%s ENDS!",m_msg.c_str());
 }
};

AppDelegate::AppDelegate() {
 LOG_FUNCTION_LIFE
}

AppDelegate::~AppDelegate() 
{
 LOG_FUNCTION_LIFE
}

bool AppDelegate::applicationDidFinishLaunching() {
 LOG_FUNCTION_LIFE

    // initialize director
    auto director = Director::getInstance();
    auto glview = director->getOpenGLView();
    if(!glview) {
        glview = GLView::create(FontChina::G2U("郝萌主之找小三"));
        director->setOpenGLView(glview);
    }

    // turn on display FPS
    director->setDisplayStats(false);

    // set FPS. the default value is 1.0/60 if you don‘t call this
    director->setAnimationInterval(1.0 / 60);

    // create a scene. it‘s an autorelease object
    auto scene = HelloWorld::createScene();

    // run
    director->runWithScene(scene);

    return true;
}

// This function will be called when the app is inactive. When comes a phone call,it‘s be invoked too
void AppDelegate::applicationDidEnterBackground() {
 LOG_FUNCTION_LIFE

    Director::getInstance()->stopAnimation();

    // if you use SimpleAudioEngine, it must be pause
    SimpleAudioEngine::getInstance()->pauseBackgroundMusic();
}

// this function will be called when the app is active again
void AppDelegate::applicationWillEnterForeground() {
 LOG_FUNCTION_LIFE

    Director::getInstance()->startAnimation();

    // if you use SimpleAudioEngine, it must resume here
    SimpleAudioEngine::getInstance()->resumeBackgroundMusic();
}

12、Cocos2dx 3.0遊戲開發找小三之3.0中的生命周期分析