cocos2d-x - Cocos2dx 中的 CCScrollLayer

Question

我必须为我的图层进行垂直滚动。我尝试了 CCScrollLayer 但它不起作用。我怎样才能做到这一点？

MissionLayer.h

#include "cocos2d.h"

using namespace cocos2d;    
class MissionLayer : public CCLayer
{    
public:
    MissionLayer();
    virtual ~MissionLayer();
    CREATE_FUNC(MissionLayer);
};    

MissionLayer.cpp

MissionLayer::MissionLayer()
{
    // TODO Auto-generated constructor stub 
    CCSprite* sprite = CCSprite::create("tab2_scene.jpg");
    addChild(sprite,1);    
}    
MissionLayer::~MissionLayer() {
    // TODO Auto-generated destructor stub
}

Answer 1

首先，在Mission层启用触摸

setTouchEnabled(true); //in your constructor or init method

之后，对于仅在 Y 轴上的移动，您的 (ccTouchesMoved/ccTouchMoved) 将如下所示

void MissionLayer::ccTouchesMoved(CCSet* pTouches, CCEvent* event)
{
 CCTouch *touch=(CCTouch*)pTouches->anyObject();
 CCPoint newTouchLocation = touch->getLocationInView();
 newTouchLocation = CCDirector::sharedDirector()->convertToGL(newTouchLocation);

 CCPoint oldTouchLocation = touch->getPreviousLocationInView();
 oldTouchLocation = CCDirector::sharedDirector()->convertToGL(oldTouchLocation);

 //get the difference in the finger touches when the player was dragging
 float differenceY = newTouchLocation.y- oldTouchLocation.y; //Only in Y axis  
 float newPosY=getPositionY()+differenceY;

 // Now we have to check new position comes in bounding box .
 // Let assume maxY,minY are upper or lower limit    

 if (newPosY>minY) {
    newPosY=minY;
 }   
 if (newPosY < maxY) {
    newPosY=maxY;
 }
 setPositionY(newPosY);
}