Cleanest Way of Capturing Volume Up/Down Button Press on iOS 8

Swift: Detect Volume Button Press NOT volume change events

So what I'd do is subscribe to the notification like they do in the questions you linked and then add a variable named say programmaticVolumeChange. When you change the volume programmatically set the variable to true, then in your function observeValueForKeyPath, if the variable is true don't cancel the alarm (and naturally set it to false after). That way when the user presses the volume buttons you know it wasn't your code. Maybe test the amount of time between a programmatic volume change and the function call but I think that would be fine.

Eg

var programmaticVolumeChange = false

func changeVolumeProgramatically() {

    programmaticVolumeChange = true
    //change volume programmatically after

}

override func observeValueForKeyPath(keyPath: String, ofObject object: AnyObject,
change: [NSObject : AnyObject], context: UnsafeMutablePointer) {

    if keyPath == "outputVolume"{

        if programmaticVolumeChange {

            programmaticVolumeChange = false

        } else {

            //handle logic for user volume button press

        }

    }

}

program access to iPhone volume buttons

After the recent rejections from Apple

Do not use this. Apple now uses some patch which would reject your app straightaway if it uses any of the private APIs - though should note here that quite some apps on the App Store use this already and are still there!

The only way to do this now is to have an AVAudioPlayer prepared to play but not playing ([player prepareToPlay]). This seems to take care of adjusting the app's volume according to the rocker buttons.

There's no other published way currently to handle this.

PLEASE READ THE ABOVE NOTE

Yes, Use the MPVolumeView

MPVolumeView *volume = [[[MPVolumeView alloc] initWithFrame:CGRectMake(18.0, 340.0, 284.0, 23.0)] autorelease];
  [[self view] addSubview:volume];

  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(volumeChanged:) 
                                        name:@"AVSystemController_SystemVolumeDidChangeNotification" 
                                        object:nil];    
  for (UIView *view in [volume subviews]){
    if ([[[view class] description] isEqualToString:@"MPVolumeSlider"]) {
      volumeViewSlider = view;  //volumeViewSlider is a UIView * object
    }
  }
  [volumeViewSlider _updateVolumeFromAVSystemController];

-(IBAction)volumeChanged:(id)sender{
  [volumeViewSlider _updateVolumeFromAVSystemController];
}

This will give you a slider (same as one used in ipod) whose value will change acc to volume of the phone

You will get a compile-time warning that view may not respond to _updateVolumeFromAVSystemControl, but just ignore it.

iOS use the volume buttons as input

See the Audio Session Services References for more details, but basically you start an audio session with AudioSessionInitialize. Then you make it active with AudioSessionSetActive. Then listen for changes in the volume with AudioSessionAddPropertyListener where you can pass a callback that has type AudioSessionPropertyListener.

Check the following website out for an example:
http://fredandrandall.com/blog/2011/11/18/taking-control-of-the-volume-buttons-on-ios-like-camera/

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