How to change an iOS device volume programmatically?

问题

Is there a way to change the device volume programmatically? maybe using audio session?

回答1:

I'm pretty sure that it is not possible to control the actual device volume (as this would also be a bit obtrusive) Controlling some media you're playing is another thing. You could however look into MPVolumeView: https://developer.apple.com/library/ios/documentation/MediaPlayer/Reference/MPVolumeView_Class/index.html for displaying a view for setting the volume.

The question has also been discussed here: How to change device Volume on iOS - not music volume

回答2:

Look at this:

import MediaPlayer

let volumeView = MPVolumeView()
if let view = volumeView.subviews.first as? UISlider{
    view.value = 0.1 //---0 t0 1.0---

}

Its working for me

回答3:

Here you go, this worked for me.

#import <MediaPlayer/MediaPlayer.h>
musicPlayer = [MPMusicPlayerController applicationMusicPlayer];
musicPlayer.volume = 1; // max volume
musicPlayer.volume = 0; // min volume (mute)
musicPlayer.volume = 0.0625; // 1 bar on the overlay volume display

回答4:

Hacky but works (Swift 3):

func setVolumeTo(volume: Float) {
  (MPVolumeView().subviews.filter{NSStringFromClass($0.classForCoder) == "MPVolumeSlider"}.first as? UISlider)?.setValue(volume, animated: false)
}

Don't forget to import MediaPlayer

来源：https://stackoverflow.com/questions/29049699/how-to-change-an-ios-device-volume-programmatically