iOS: Missing audio routes/sources in MPVolumeView
问题 I work on an audio app (using audio units). One of the requirements is to be able to change the audio route from the UI (Earpiece, Speaker, Connected Bluetooth device etc.). I use the MPVolumeView for this. Recently I have a bug with the list of routes that are displayed in the action sheet that is opened when tapping the route button in the volume view. I think that the problem appears only in iOS6, but not sure about that. The result is random: sometimes it displays only iPhone sometimes it