Can't increment integer in Cocos2d-x V 3.0 - c++

Question

I need to increment an integer.I have this code here :
Utils.h :
class Utils{
static HUD* hudLayer();
static Layer* layerWithTag(int tag);
};
Utils.cpp :
HUD* Utils::hudLayer(){
return (HUD*)Utils::layerWithTag(TAG_HUD);
}
Layer* Utils::layerWithTag(int tag)
{
Scene *sc = Director::getInstance()->getRunningScene();
if (sc->getTag() == TAG_GAME_SCENE) {
Layer *layer = (Layer *)sc->getChildByTag(tag);
return layer;
}
return NULL;
}
HUD.h
class HUD : public Layer{
public:
int score1;
Label* scoreLabel1;
virtual bool init();
void didScore();
CREATE_FUNC(HUD);
};
HUD.cpp :
bool HUD::init(){
if(!Layer::init()){return false;}
score1 = 0;
scoreLabel1 = Label::createWithSystemFont(CCString::createWithFormat("Score : %d",score1)->getCString(), “Arial“, 64);
scoreLabel1->setAnchorPoint(Point(0.0f, 1.0f));
scoreLabel1->setPosition(Point(20, Utils::s().height-10));
this->addChild(scoreLabel1);
return true;
}
void HUD::didScore(){
score1+=10; // Error HERE after coming from onTouchBegan (says parentis null)
scoreLabel1->setString(CCString::createWithFormat("Score : %d",score1)->getCString());
}
In GameScene.h now i have this in onTouchBegan method :
bool GameScene::onTouchBegan(cocos2d::Touch *touch, cocos2d::Event *unused_event)
{
Point location = touch->getLocationInView();
location = Director::getInstance()->convertToGL(location);
if(location.x < 300.0f){
Utils::hudLayer()->didScore();
}
return true;
}
What am i doing wrong here ?
I can increment an integer in V 2.x the same way but not in V 3.0 . WHY ?

Answer 1

In cocos2d-x v3 is a new listener system for events (touches, accelerometr etc.), you need to create listener for getting touches. In GameScene::init you should put something like that
auto listener1 = EventListenerTouchOneByOne::create();
listener1->setSwallowTouches(true);
listener1->onTouchBegan = CC_CALLBACK_2(GameScene::onTouchBegan, this);
this->getEventDispatcher()->addEventListenerWithSceneGraphPriority(listener1, this);
Look at:
http://www.cocos2d-x.org/wiki/EventDispatcher_Mechanism