Swift: Setting AVAudioSession Output Volume

Question

Is there a way to set the AVAudioSession outputVolume?

    self.audioSession = AVAudioSession.sharedInstance()
    self.audioSession.setActive(true, error: n         


        

Answer 1

The outputVolume property is read-only. This is due to Apple's conviction that a good user experience will be broken if apps unexpectedly modify sound volume beyond user control.

From the AVAudioSession docs:

The system wide output volume can be set directly only by the user; to provide volume control in your app, use the MPVolumeView class

So this is your only (easy) option...

  MPVolumeView *myVolumeView =
    [[MPVolumeView alloc] initWithFrame:frame];
    [self.view addSubview: myVolumeView];

Answer 2

I was able to change the main volume using the following on iOS 8

#import <MediaPlayer/MediaPlayer.h>

[[MPMusicPlayerController applicationMusicPlayer] setVolume:0.0];
[[MPMusicPlayerController iPodMusicPlayer] setVolume:0.0];

for info, the code is called thru a Cordova pluggin. This effects the main volume (the device volume popup show the new volume when code is called)