（六）

事件监听

    auto listen = EventListenerTouchOneByOne::create();
    listen->setSwallowTouches(true);
    listen->onTouchBegan = [](Touch* touch,Event* event){
        CCLog("onTouchBegan");
        return true;
    };

    listen->onTouchMoved = [](Touch* touch,Event* event){
        CCLog("onTouchMoved");
    };

    listen->onTouchEnded = [](Touch* touch,Event* event){
        CCLog("onTouchEnded");
    };

    Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraphPriority(listen, this);

同一个事件监听器可以绑定多个对象，但必须使用事件监听器的复本，如：

Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraphPriority(listen, sprite);
Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraphPriority(listen->clone(), ttf);

Director::getInstance()->getEventDispatcher() 也可以用 _eventDispatcher 代替。

（六）