Category identifiers for audio sessions, used as values for the
Each app running in iOS has a single audio session, which in turn has a single category. You can change your audio session’s category while your app is running.
You can refine the configuration provided by the
k categories by using an audio session mode, as described in Audio Session Modes.
k category when you want your sounds to mix with other audio (such as from the iPod app). Use one of the other playback categories when you want audio from other apps to be silenced when your session is active. However, you can enable mixing for the
k categories by using the
k property. For more information on audio session categories, see Audio Session Programming Guide.