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【本段代码可以单独使用在一个场景中，作为一个独立完整的功能模块使用！】

该段代码可以实现滑动改变音量以及自动保存的功能，

可以在单独设定的页面中对音量，以及音效进行单独分别的设定。

图片使用的附件是cocos引擎text例子内的代码。

【效果图】

【实例代码】

<span style="font-size:14px;">#include "ui/CocosGUI.h"
USING_NS_CC;
using namespace ui;

Scene* AudioControl::createScene(){
    auto scene =Scene::create();
    auto layer =AudioControl::create();
    scene->addChild(layer);
    return scene;
}


bool AudioControl::init(){
    if(!Layer::init()){
        return false;
    }
    
    //获得设备尺寸
    Size visibleSize = Director::getInstance()->getVisibleSize();
    
    //BGM条
    //创建背景音乐文本，并添加为当前层的子节点
    auto music_text = Text::create("音乐音量","Arial",32);
    music_text->setPosition(Vec2(visibleSize.width*0.25,visibleSize.height*0.7));
    this->addChild(music_text);
    //创建一个滑动进度条
    auto music_slider=Slider::create();
    music_slider->loadBarTexture("sliderTrack.png");
    music_slider->loadSlidBallTextures("sliderThumb.png","sliderThumb.png","");
    music_slider->loadProgressBarTexture("sliderProgress.png");
    //获取之前设置的音乐音量
    float musicPercent = UserDefault::getInstance()->getFloatForKey("musicPercent");
    
//    //第一次默认100
//    if(musicPercent == 0.0f){
//        musicPercent = 100.0f;
//    }
    
    //设置背景初始值
    music_slider->setPercent(musicPercent);
    music_slider->cocos2d::Node::setPosition(Vec2(visibleSize.width*0.6,visibleSize.height*0.7));
    //添加监听器
    music_slider->addEventListener([=](Ref* pSender,Slider::EventType type){
        //当滑块的百分比发生变化的时候
        if(type== Slider::EventType::ON_PERCENTAGE_CHANGED){
            //获得滑动条的百分比
            int percent = music_slider->getPercent();
            SimpleAudioEngine::getInstance()->setBackgroundMusicVolume(float(percent)/100);
            UserDefault::getInstance()->setFloatForKey("musicPercent",percent);
        }
    });
    this->addChild(music_slider);
    
    //EF条
    //文
    auto sound_text =Text::create("音效音量",32);
    sound_text->setPosition(Vec2(visibleSize.width*0.25,visibleSize.height*0.5));
    this->addChild(sound_text);
    
    //条
    auto effects_slider =Slider::create();
    effects_slider->loadBarTexture("sliderTrack.png");//条材质
    effects_slider->loadSlidBallTextures("sliderThumb.png","");
    effects_slider->loadProgressBarTexture("sliderProgress.png");
    
    float effectPercent = UserDefault::getInstance()->getFloatForKey("effectPercent");//获取之前设定EF值
    
//    if (effectPercent == 0.0f) {//初次进入100
//        effectPercent = 100.0f;
//    }
    
    effects_slider->setPercent(effectPercent);//设定初始值
    effects_slider->cocos2d::Node::setPosition(Vec2(visibleSize.width*0.6,visibleSize.height*0.5));
    effects_slider->addEventListener([=](Ref* pSender,Slider::EventType type){//获取，改变
        if(type== Slider::EventType::ON_PERCENTAGE_CHANGED){
        int percent = effects_slider->getPercent();
        SimpleAudioEngine::getInstance()->setEffectsVolume(float(percent)/100);
        UserDefault::getInstance()->setFloatForKey("effectPercent",percent);
        }
    });
    this->addChild(effects_slider);
    
    //返回
    auto return_button = Button::create("b1.png");
    return_button->setPosition(Vec2(visibleSize.width/2,visibleSize.width/2-300));
    return_button->getContentSize().width/2;
    return_button->getContentSize().height/2;
    
    return_button->addTouchEventListener([](Ref* pSender,Widget::TouchEventType type){
        
    if (type == Widget::TouchEventType::ENDED) {
        auto transition = TransitionSlideInL::create(0.3,GameMenu::createScene());
        Director::getInstance()->replaceScene(transition);
        }
    });
    this->addChild(return_button);
    
    //版权
    auto banner_text = Text::create("『帮助』自动保存设置声量大小","Arial-BoldMT",32);
    banner_text->setPosition(Vec2(visibleSize.width/2,visibleSize.height*0.15));
    this->addChild(banner_text);
    
    //网址
    auto email_text = Text::create("wy66666666@qq.com",32);
    email_text->setPosition(Vec2(visibleSize.width/2,visibleSize.height*0.1));
    this->addChild(email_text);
    
    return true;
}</span>

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