cocos2dx触摸事件问题

下面是教程中正确的代码

   bool TowerPanleLayer::init()

{

   if(!Layer::init())
   {
       return false;
   }
      //初始化缓存帧
   auto cache = SpriteFrameCache::sharedSpriteFrameCache();
   cache->addSpriteFramesWithFile("TArrow-hd.plist","TArrow-hd.png");
   cache->addSpriteFramesWithFile("TPin-hd.plist","TPin-hd.png");
   cache->addSpriteFramesWithFile("TSun-hd.plist","TSun-hd.png");
      //定义菜单精灵
   this->sprite = Sprite::createWithSpriteFrame(cache->spriteFrameByName("select_01.png"));
   this->addChild(sprite,0);
       //定义菜单项精灵
   this->sprite1 = Sprite::createWithSpriteFrame(cache->spriteFrameByName("Arrow01.png"));
   this->sprite1->setPosition(- this->sprite1->getContentSize().width,- this->sprite1->getContentSize().height);
   this->addChild(sprite1,1);

   this->sprite2 = Sprite::createWithSpriteFrame(cache->spriteFrameByName("Pin01.png"));
   this->sprite2->setPosition(0,- this->sprite2->getContentSize().height);
   this->addChild(sprite2,1);

   this->sprite3 = Sprite::createWithSpriteFrame(cache->spriteFrameByName("Sun01.png"));
   this->sprite3->setPosition(this->sprite3->getContentSize().width,- this->sprite3->getContentSize().height);
   this->addChild(sprite3,1);
   //监听器
   auto touchListener = EventListenerTouchOneByOne::create();
   touchListener->setSwallowTouches(true);
   touchListener->onTouchBegan = CC_CALLBACK_2(TowerPanleLayer::onTouchBegan,this);
   touchListener->onTouchEnded = CC_CALLBACK_2(TowerPanleLayer::onTouchEnded,this);
       //到下面这个位置，我就不懂了
   _eventDispatcher->addEventListenerWithSceneGraphPriority(touchListener,sprite1);
   _eventDispatcher->addEventListenerWithSceneGraphPriority(touchListener->clone(),sprite2);
   _eventDispatcher->addEventListenerWithSceneGraphPriority(touchListener->clone(),sprite3);    
   return true;

}

bool TowerPanleLayer::onTouchBegan(Touch touch,Event event)
{

   auto target = static_cast<Sprite*>(event->getCurrentTarget());
   
   Point locationInNode = target->convertTouchToNodeSpace(touch);
   Size size = target->getContentSize();
   Rect rect = Rect(0, 0, size.width, size.height);
   
   if (rect.containsPoint(locationInNode))
   {
       target->setOpacity(180);
       return true;
   }
   return false;
   //return true;

}

void TowerPanleLayer::onTouchEnded(Touch touch,Event event)
{

   auto tagert = static_cast<Sprite*>(event->getCurrentTarget());
   if(tagert == sprite1)
   {
       this->setChooseTower(ARROW);
   }
   else if(tagert == sprite2)
   {
       this->setChooseTower(PIN);
   }
   else if(tagert == sprite3)
   {
       this->setChooseTower(SUN);
   }
   else 
   {
       this->setChooseTower(ANOTHER);
   }

}

3.当我修改代码后就不对了,无论我点哪个菜单选项，都会选在sprite3上

bool TowerPanleLayer::onTouchBegan(Touch* touch,Event* event)
{
    //auto target = static_cast<Sprite*>(event->getCurrentTarget());
    //Point locationInNode = target->convertTouchToNodeSpace(touch);
    //Size size = target->getContentSize();
    //Rect rect = Rect(0, 0, size.width, size.height);
    //if (rect.containsPoint(locationInNode))
    //{
    //    target->setOpacity(180);
    //    return true;
    //}
    //return false;
    return true;
}

我觉得我注释掉的代码可有可无，但为什么不能去掉。
我注释掉的代码的作用是什么？
谢谢您阅读到这。

auto target = static_cast<Sprite*>(event->getCurrentTarget());//获取到你点击的对象具体是哪个精灵
Point locationInNode = target->convertTouchToNodeSpace(touch);//获取到点击位置在你这个对象的相对位置
Size size = target->getContentSize();//对象内容大小，在后面用来判断是否点中了某对象的区域
Rect rect = Rect(0, 0, size.width, size.height);//包含这个对象的矩形区域
if (rect.containsPoint(locationInNode))//矩形局域检测，点是否在矩形内部
{//在内部就执行下面，设置透明度给你看到，并且前面设置了吞噬（setSwallowTouches），那么这里传递return true会传递消息到你的onTouchEnded，并且其他注册了精灵对象的会收不到点击事件了，被吞噬了。
    target->setOpacity(180);
    return true;
}
return false;

希望对你有用！

onTouchBegan返回值决定是否将按键响应延场景树往下传。原来的代码用于判断有没有按到sprite 上。按到了刚设置半透明并不再往下传了，去掉判断后强制响应场景中最后的sprite3并不再往下传事件了。

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