Cocos2d-x应用程序代码不允许在iPhone或iPad上使用音量控制按钮

// 在你的场景类中添加以下代码

#include "cocos2d.h"
#include "SimpleAudioEngine.h"

USING_NS_CC;

class MyScene : public Scene
{
public:
    virtual bool init()
    {
        if (!Scene::init())
        {
            return false;
        }

        // 监听音量变化事件
        auto listener = EventListenerKeyboard::create();
        listener->onKeyPressed = CC_CALLBACK_2(MyScene::onKeyPressed, this);
        _eventDispatcher->addEventListenerWithSceneGraphPriority(listener, this);

        return true;
    }

    void onKeyPressed(EventKeyboard::KeyCode keyCode, Event* event)
    {
        if (keyCode == EventKeyboard::KeyCode::KEY_VOLUME_UP)
        {
            // 增加音量
            CocosDenshion::SimpleAudioEngine::getInstance()->setEffectsVolume(
                CocosDenshion::SimpleAudioEngine::getInstance()->getEffectsVolume() + 0.1f);
        }
        else if (keyCode == EventKeyboard::KeyCode::KEY_VOLUME_DOWN)
        {
            // 减少音量
            CocosDenshion::SimpleAudioEngine::getInstance()->setEffectsVolume(
                CocosDenshion::SimpleAudioEngine::getInstance()->getEffectsVolume() - 0.1f);
        }
    }

    CREATE_FUNC(MyScene);
};

// 在你的应用程序入口中创建并运行场景

int main(int argc, char** argv)
{
    // 初始化游戏引擎
    Application app(argc, argv);

    // 创建场景
    auto scene = MyScene::create();

    // 运行场景
    Director::getInstance()->runWithScene(scene);

    // 开始游戏循环
    return app.run();
}