cocos2d-x 使用schedule实现倒计时

//实现倒计时 this->_down_Label =CCLabelTTF::create(); CCString* downStr = CCString::createWithFormat("%d",this->_dowmTime); this->_down_Label->setString(downStr->m_sString.c_str()); this->addChild(this->_down_Label,3); this->_down_Label->setPosition(ccp(this->_shootCard->getPosition().x,this->_shootCard->getPosition().y)); this->_down_Label->setFontSize(30); //更新倒计时 void GameLayer::downTime(float dt) { this->_dowmTime =this->_dowmTime -1; CCString* downStr = CCString::createWithFormat("%d",this->_dowmTime); this->_down_Label->setString(downStr->m_sString.c_str()); } schedule(schedule_selector(GameLayer::downTime),1.0f);