title: Detect iPhone Volume Button Up Press?
body: <p>Is there a notification that I can listen to that will tell me when an iPhone's volume is turned <strong>up</strong>? </p>
  
  <p>I know about the <code>AVSystemController_SystemVolumeDidChangeNotification</code>, but it is essential that the notification only be triggered when the volume has been turned up, not up or down.</p>
  
  <p>Secondly, how can I hide the translucent view that appears when the volume up button is pressed, showing the system's volume?  <strong>Camera+</strong> has implemented this.</p>