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How can I hide a popup message when the up / down zoom button is pressed

I am trying to create an application that uses this event when I press the volume up / down buttons. I use the event as follows:

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(volumeChanged:) 
                                             name:@"AVSystemController_SystemVolumeDidChangeNotification" 
                                           object:nil];

when one of the volume buttons is pressed, the "VolumeChanged:" function is called.

My problem is that when I press one of the volume buttons, I also get a default notification that shows the current level of bars. I want to hide this message, so when you press the volume buttons nothing will appear. Does anyone know how to do this?

ps I do not care about the volume itself. all i care about is the button events and the message that appears when one of them is pressed.

thank.

this notification

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1

Edit:
. .

- , MPVolumeView.
4.2 : showsVolumeSlider showsRouteButton.

P.S. StackOverflow:) , ;)

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