listener事件不响应啊 ，求解。。。。
m_root=GUIReader::getInstance()->widgetFromJsonFile(“BagCell/BagCell_1.json”);
m_root->setTouchEnabled(true);
this->addChild(m_root);
auto listener=EventListenerTouchOneByOne::create();
listener->onTouchBegan=CC_CALLBACK_2(HelloWorld::touchBegan, this);
listener->onTouchMoved=CC_CALLBACK_2(HelloWorld::touchMove, this);
listener->onTouchEnded=CC_CALLBACK_2(HelloWorld::touchEnd, this);
this->getEventDispatcher()->addEventListenerWithSceneGraphPriority(listener, this);