bool HelloWorld::init(){  bool bRet = false;  do  {    CC_BREAK_IF(! CCLayer::init());		//設置一個顯示字符串的label		CCLabelTTF * title = CCLabelTTF::create("slider value = 0.00","Arial",32);		title->setPosition(ccp(240,200));		//設置label的tag為1，方便以后獲取		this->addChild(title,0,1);		//這三張圖片分別是底部，進度條，控制按鈕		CCControlSlider * slider = CCControlSlider::create("sliderTrack.png","sliderProgress.png",			"sliderThumb.png");		//設置slider的最大值最小值		slider->setMaximumValue(100);		slider->setMinimumValue(0);		//為slider添加事件監聽函數		slider->addTargetWithActionForControlEvents(this,cccontrol_selector(HelloWorld::valueChanged),			CCControlEventValueChanged);		//設置位置		slider->setPosition(ccp(240,160));		this->addChild(slider);		//使用CCControlSlider實現血量條，只要將第三個控制按鈕改為透明的就可以了，就會貌似血量條了		CCControlSlider * slider2 = CCControlSlider::create("sliderTrack.png","progress.png","sliderThumb2.png");		//通過以下函數使得認為的不能改變它的值		slider2->setTouchEnabled(false);		slider2->setMaximumValue(100);		slider2->setMinimumValue(0);		//可以添加事件處理函數，在事件處理函數中改變它的value		slider2->setValue(100);		slider2->setPosition(ccp(240,100));		this->addChild(slider2);    bRet = true;  } while (0);  return bRet;}//注意這個函數需要傳入的倆個參數類型void HelloWorld::valueChanged(CCObject * pSender,CCControlEvent controlEvent) {	CCControlSlider * slider = (CCControlSlider *)pSender;	CCLabelTTF * title = (CCLabelTTF *)this->getChildByTag(1);	//使用CCLabelTTF的時候盡量不要重新改變它的內容，這里是為了簡便起見	title->setString(CCString::createWithFormat("slider value = %0.02f",slider->getValue())->getCString()); }