UI开发之控件类-CCControlSlider

bool HelloWorld::init()
{
bool bRet = false;
do
{

CC_BREAK_IF(! CCLayer::init());

//设置一个显示字符串的label
CCLabelTTF * title = CCLabelTTF::create("slider value = 0.00","Arial",32);
title->setPosition(ccp(240,200));
//设置label的tag为1，方便以后获取
this->addChild(title,1,1);

CCControlSlider * slider = CCControlSlider::create("sliderTrack.png","sliderProgress.png",
"sliderThumb.png");

//设置slider的最大值最小值
slider->setMaximumValue(100.0);
slider->setMinimumValue(0.0);

//为slider添加事件监听函数
slider->addTargetWithActionForControlEvents(this,cccontrol_selector(HelloWorld::valueChanged),
CCControlEventValueChanged);

//设置位置
slider->setPosition(ccp(240,160));
this->addChild(slider);

bRet = true;
} while (0);

return bRet;
}

void HelloWorld::valueChanged(CCObject * pSender,CCControlEvent controlEvent)
{
CCControlSlider * slider = (CCControlSlider *)pSender;
CCLabelTTF * title = (CCLabelTTF *)this->getChildByTag(1);
title->setString(CCString::createWithFormat("slider value = %0.02f",slider->getValue())->getCString());
}