iOS 9: How to change volume programmatically without showing system sound bar popup?

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For 2018, working on iOS 11.4

You need to change slider.value after a small delay.

extension MPVolumeView {
  static func setVolume(_ volume: Float) {
    let volumeView = MPVolumeView()
    let slider = volumeView.subviews.first(where: { $0 is UISlider }) as? UISlider

    DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 0.01) {
      slider?.value = volume
    }
  }
}

Usage:

MPVolumeView.setVolume(0.5)

Objective-C version

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