cocos2dx 每次单点触碰后回调函数出发两次

Question

本意是想点击一次屏幕生成一个小球，然后测试一下物理引擎。但是运行后每次点击会出现两个小球，我试着在生成小球的函数addNewSpriteAtPosition里Log了一下，发现这个函数执行了两次，但仍然找不到解决的办法。以下为截图和代码，感谢解答:

#include "HelloWorldScene.h"
#include "SimpleAudioEngine.h"

USING_NS_CC;

Scene* HelloWorld::createScene()
{
    auto scene = Scene::createWithPhysics();
    scene->getPhysicsWorld()->setDebugDrawMask(PhysicsWorld::DEBUGDRAW_ALL); 
    auto layer = HelloWorld::create();
    scene->addChild(layer);
    return scene;
}

void HelloWorld::addNewSpriteAtPosition(Vec2 p) {
    auto sp = Sprite::create("ball.png");
    sp->setContentSize(Size(50, 50));
    auto body = PhysicsBody::createCircle(sp->getContentSize().width / 2);
    sp->setPhysicsBody(body);
    sp->setPosition(p);
    this->addChild(sp);
    /*检查出这个函数执行了两次*/
    int temp = rand() % 100;
    CCLOG("%d\n",temp);
}

bool HelloWorld::TouchBegan(Touch *touch, Event *unused_event) {
    Vec2 location = touch->getLocation();
    addNewSpriteAtPosition(location);
    return true;
}

bool HelloWorld::init()
{

    if (!Scene::init())
{
    return false;
}
Size visiableSize = Director::getInstance()->getVisibleSize();
Vec2 origin = Director::getInstance()->getVisibleOrigin();
auto body = PhysicsBody::createEdgeBox(visiableSize, PHYSICSBODY_MATERIAL_DEFAULT, 5.0f);
auto edgeNode = Node::create();
edgeNode->setPosition(Vec2(visiableSize.width / 2, visiableSize.height / 2));
edgeNode->setPhysicsBody(body);
this->addChild(edgeNode);
/*单点触控*/
auto listener = EventListenerTouchOneByOne::create();
listener->onTouchBegan = CC_CALLBACK_2(HelloWorld::TouchBegan, this);
listener->onTouchMoved = NULL;
listener->onTouchEnded = NULL;
_eventDispatcher->addEventListenerWithSceneGraphPriority(listener, this);

return true;
}


void HelloWorld::menuCloseCallback(Ref* pSender)
{
    //Close the cocos2d-x game scene and quit the application
    Director::getInstance()->end();

    #if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
exit(0);
#endif
    
    /*To navigate back to native iOS screen(if present) without quitting the application  ,do not use Director::getInstance()->end() and exit(0) as given above,instead trigger a custom event created in RootViewController.mm as below*/
    
    //EventCustom customEndEvent("game_scene_close_event");
    //_eventDispatcher->dispatchEvent(&customEndEvent);
    
    
}