- iOS 3.0+
UInt32 value. By default, the value of this property is
Setting this property to
TRUE (any nonzero value) allows audio mixing with other apps. Other aspects of these categories, such as their Silent switch behavior, are not affected. (The switch is called the Ring/Silent switch on iPhone.)
When the audio session category changes, such as during an interruption, the value of this property reverts to
FALSE. To regain mixing behavior you must then re-set this property.
Always check to see if setting this property succeeds or fails, and react appropriately; behavior may change in future releases of iOS.