解释：

bool CCMenu::initWithArray(CCArray* pArrayOfItems)
{
    if (CCLayer::init())
    {

        // menu in the center of the screen
        CCSize s = CCDirector::sharedDirector()->getWinSize();

        this->ignoreAnchorPointForPosition(true);
        setAnchorPoint(ccp(0.5f,0.5f));
        this->setContentSize(s);

        setPosition(ccp(s.width/2,s.height/2));
        
        return true;
    }
    return false;
}