2.2.6版本的sprite怎么拉伸全屏？

Cocos2d-x
#1

2.2.6版本的sprite怎么拉伸全屏？
CCSize visibleSize = CCDirector::sharedDirector()->getVisibleSize();
backgroundSpite->setContentSize(visibleSize);
这样不行

#2

试下这样…

CCSize visibleSize = CCDirector::sharedDirector()->getVisibleSize();
CCSize sprSize = backgroundSpite->getContentSize();
backgroundSpite->setScaleX(visibleSize.x / sprSize.x);
backgroundSpite->setScaleX(visibleSize.y / sprSize.y);

#3

上面错了这一句
backgroundSpite->setScaleY(visibleSize.y / sprSize.y);