An array of available output data sources for the current audio route.
- iOS 6.0+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
This property returns an array of
AVAudio objects representing available output sources, or
nil if switching between multiple output sources isn’t currently possible. Only certain USB accessories support this feature.
You can observe changes to the value of this property by using key-value observing.