A Boolean value that indicates whether the synthesizer is speaking.
UIKit for Mac 13.0+Beta
Returns YES if the synthesizer is speaking or has utterances enqueued to speak, even if it is currently paused. Returns NO if the synthesizer has finished speaking all utterances in its queue or if it has not yet been given an utterance to speak.
This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.