各位大大，最近在学习Cocos2dx的过程中，有个问题弄了好久都没有结果，就上来论坛问问。
如图有两个蓝色小球，做贝塞尔曲线运动。
想得到的结果做曲线运动的同时向上移动。
一开始是直接做曲线运动，而小球所在的Layer在update中下移，但是小球也会跟着下移，想了好久都不知道如何解决，求救。。
Sprite *ball1 = Sprite::create("circle_2.png");
ball1->setPosition(Point(visibleSize.width / 2, visibleSize.height * 2 / 11));
ball1->setTag(1);
Sprite *ball2 = Sprite::create("circle_2.png");
ball2->setPosition(Point(visibleSize.width / 2, visibleSize.height * 4 / 11));
ball2->setTag(2);
this->addChild(ball1);
this->addChild(ball2);
ccBezierConfig bezierCon_1;
bezierCon_1.controlPoint_1 = Point(visibleSize.width / 2 + visibleSize.height / 11 + ball1->getContentSize().width, visibleSize.height * 2 / 11);
bezierCon_1.controlPoint_2 = Point(visibleSize.width / 2 + visibleSize.height / 11 + ball1->getContentSize().width, visibleSize.height * 4 / 11);
bezierCon_1.endPosition = Point(visibleSize.width / 2, visibleSize.height * 4 / 11);
BezierTo *bottomToTop = BezierTo::create(1, bezierCon_1);
ccBezierConfig bezierCon_2;
bezierCon_2.controlPoint_1 = Point(visibleSize.width / 2 - visibleSize.height / 11 - ball1->getContentSize().width, visibleSize.height * 4 / 11);
bezierCon_2.controlPoint_2 = Point(visibleSize.width / 2 - visibleSize.height / 11 - ball1->getContentSize().width, visibleSize.height * 2 / 11);
bezierCon_2.endPosition = Point(visibleSize.width / 2, visibleSize.height * 2 / 11);
BezierTo *topToBottom = BezierTo::create(1, bezierCon_2);
Sequence *ball1Sequence = Sequence::create(bottomToTop, DelayTime::create(0.5), topToBottom, DelayTime::create(0.5), NULL);
Sequence *ball2Sequence = Sequence::create(topToBottom, DelayTime::create(0.5), bottomToTop, DelayTime::create(0.5), NULL);
ball1->runAction(RepeatForever::create(ball1Sequence));
ball2->runAction(RepeatForever::create(ball2Sequence));
```