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项目中碰到个需求，需要去监听苹果手机的音量键点击事件。现在监听事件的需求，我已实现，可是我在网上查了很多资料，还是没解决如何去判断，我点击的是增大按钮，还是减小按钮，求方法，谢谢
学习是最好的投资！
http://stackoverflow.com/questions/18257199/how-to-get-system-volume-ios
float volume = [[AVAudioSession sharedInstance] outputVolume];
既然可以监听到，那一定可以获取值了，至于增大减小或许比较一下就好了吧？
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
http://stackoverflow.com/questions/18257199/how-to-get-system-volume-ios
既然可以监听到，那一定可以获取值了，至于增大减小或许比较一下就好了吧？