A hint to audio sessions that use voice prompt mode to alter the type of prompts they issue in response to other system audio, such as Siri and phone calls.
- iOS 13.0+
- Mac Catalyst 13.0+
- tvOS 13.0+
- watchOS 6.0+
Apps that issue voice prompts should observe changes in the prompt style and modify their prompts in response. This property is key-value observable.