4.3 finally :) I am searching right now how to add air play button to custom view. I have MPMoviePlayer that load movie. I disabled standard controls and added overlay view with my custom play, pause, stop, volume buttons. If anybody know how to add button that will be air play please share knowledge? I cant't find what notification to send, what to listen...:(
If you want just the AirPlay button without the volume slider follow the instructions in Jilouc's answer and then set the following properties on the myVolumeView:
[myVolumeView setShowsVolumeSlider:NO];
[myVolumeView setShowsRouteButton:YES];
That will hide the volume slider but keep the route button.