iOS隐藏系统声音弹框并拦截音量变化

//隐藏系统声音弹框

1、声明两个变量

let volumeView = MPVolumeView() //} 为了隐藏声音弹框
var volumeViewSlider = UISlider() //} 为了隐藏声音弹框

2、循环遍历

  for view in volumeView.subviews{
        if view.classForCoder.description()== "MPVolumeSlider"{
            volumeViewSlider = UISlider()
            break
        }
    }
    volumeView.frame = CGRect(x: -100,y: -100,width: 40,height: 40)
    self.view.addSubview(volumeView)

//拦截系统声音调整

//添加监听

    NotificationCenter.default.addObserver(self,selector: #selector(self.changeVolumSlider),name: [NSNotification.Name](http://nsnotification.name/)(rawValue: "AVSystemController_SystemVolumeDidChangeNotification"),object: nil)

UIApplication.shared.beginReceivingRemoteControlEvents()

@objc func changeVolumSlider(notification:NSNotification){ //记得参数加上，才能得到信息
if let volum:Float = notification.userInfo?["AVSystemController_AudioVolumeNotificationParameter"]as! Float?{
print("蓝牙拦截")
}
}