How to minimize the ringer and alert volume programmatically in iOS using Swift?

Question

如果不可能，那么是否有任何Apple文档？

Answer 1

please try using this piece of code:

func setSystemVolume(volume: Float) {
    let volumeView = MPVolumeView()

    for view in volumeView.subviews {
        if (NSStringFromClass(view.classForCoder) == "MPVolumeSlider") {
            let slider = view as! UISlider
            slider.setValue(volume, animated: false)
        }
    }
}

Hope this helps!