ios - Swift: Setting AVAudioSession Output Volume

Question

Is there a way to set the AVAudioSession outputVolume?

    self.audioSession = AVAudioSession.sharedInstance()
    self.audioSession.setActive(true, error: nil)
    self.audioSession.addObserver(self, forKeyPath: "outputVolume", options: NSKeyValueObservingOptions.New, context: nil)
    self.audioSession.outputVolume

Currently I am able to access the outputVolume, but I am having troubles of finding a way to set it.

Thanks!

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];