学步园

如果你想在layer子类里像原来那样override CClayer里的这几个函数：

   // Deprecated touch callbacks.
    CC_DEPRECATED_ATTRIBUTE virtual bool ccTouchBegan(Touch *pTouch, Event *pEvent)  final{CC_UNUSED_PARAM(pTouch); CC_UNUSED_PARAM(pEvent); return false;};
    CC_DEPRECATED_ATTRIBUTE virtual void ccTouchMoved(Touch *pTouch, Event *pEvent)  final{CC_UNUSED_PARAM(pTouch); CC_UNUSED_PARAM(pEvent);}
    CC_DEPRECATED_ATTRIBUTE virtual void ccTouchEnded(Touch *pTouch, Event *pEvent)  final{CC_UNUSED_PARAM(pTouch); CC_UNUSED_PARAM(pEvent);}
    CC_DEPRECATED_ATTRIBUTE virtual void ccTouchCancelled(Touch *pTouch, Event *pEvent)  final{CC_UNUSED_PARAM(pTouch); CC_UNUSED_PARAM(pEvent);}
    
    CC_DEPRECATED_ATTRIBUTE virtual void ccTouchesBegan(Set *pTouches, Event *pEvent)  final{CC_UNUSED_PARAM(pTouches); CC_UNUSED_PARAM(pEvent);}
    CC_DEPRECATED_ATTRIBUTE virtual void ccTouchesMoved(Set *pTouches, Event *pEvent)  final{CC_UNUSED_PARAM(pTouches); CC_UNUSED_PARAM(pEvent);}

你会发现编译错误，因为C++11的新关键字final被添加上去了，不允许被重载了。

那该怎么办呢？

cocos2d-x增加了新的机制来添加事件：

举个例子就明白了：

void OptionLayer::createEventListener()
{
	 auto dispatcher = EventDispatcher::getInstance();
	 auto listener = EventListenerTouch::create(Touch::DispatchMode::ALL_AT_ONCE);

	 listener->onTouchesBegan = CC_CALLBACK_2(OptionLayer::myTouchesBegan, this)	;

	 listener->onTouchesMoved = CC_CALLBACK_2(OptionLayer::myTouchesMoved, this)	;

	 listener->onTouchesEnded = CC_CALLBACK_2(OptionLayer::myTouchesEnded, this)	;

	 dispatcher->addEventListenerWithSceneGraphPriority(listener, this);
}

void OptionLayer::myTouchesBegan( const std::vector<Touch*>& ts, Event* event )
{
	auto winSize = Director::getInstance()->getWinSize();
	auto iter = ts.begin();

	while (iter != ts.end()) {
		Touch *t = (Touch*)(*iter);
		Point p = t->getLocation();
		// left，当触控操作的起点小于屏幕宽度的一半，说明触控发生在左屏
		if (p.x <= winSize.width / 2) {
			_activityJoystick(p);
		} else {
			// right，否则发生在右屏，会产生“攻击”信号
			_delegator->onAttack();
		}

		iter++;
	}
}

好了，注意lamba函数的建立，一般按照上面建立比较好！