ios - 在 iOS 11 中播放音乐库时更改和隐藏音量 HUD(音量叠加)

Question

我正在使用 MPMusicPlayerController.applicationQueuePlayer 来控制播放内部音乐。

extension MPVolumeView {
    var volumeSlider: UISlider? {
        showsRouteButton = false
        showsVolumeSlider = false
        isHidden = true
        for subview in subviews where subview is UISlider {
            let slider =  subview as! UISlider
            slider.isContinuous = false
            slider.value = AVAudioSession.sharedInstance().outputVolume
            return slider
        }
        return nil
    }
}

let player = MPMusicPlayerController.applicationQueuePlayer
player.shuffleMode = .off
player.setQueue(with: MPMediaItemCollection(items: [mediaItem]))
player.play()

let volView = MPVolumeView()
view.addSubview(volView)
UIApplication.shared.keyWindow?.insertSubview(volView, at: 0)
volView.frame.origin.x = -1000

/* I also tried:
MPVolumeView(frame: .zero)
MPVolumeView(frame: CGRect(x: -1000, y: -1000, width: 0, height: 0))
none of them works.
*/

// get the slider to change to volume
let slider = volView.volumeSlider!

// set the volume. when I change, the volume HUD appears. but I want to stop appearing.
slider.setValue(1, animated: false)

我想知道在更改音量时，如何停止弹出音量 HUD？

已编辑。

Answer 1

系统音量是用户体验 任何你可以使用它的方式

UIApplication.shared.keyWindow?.insertSubview(MPVolumeView(), at: 0)