A Boolean value that indicates whether another application is playing audio.
- iOS 8.0+
- tvOS 9.0+
- watchOS 2.0+
The value is
true when another application with a non-mixable audio session is playing audio.
Applications should use this property as a hint to silence audio that is secondary to the functionality of the application. For example, a game using
ambient can use this property to decide to mute its soundtrack while leaving its sound effects unmuted.