Tells the delegate when the synthesizer has begun speaking an utterance.
- iOS 7.0+
- macOS 10.14+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
The synthesizer speaking the utterance that this message applies to.
The utterance that has begun to be spoken.
If the value of the utterance’s
pre property is grreater than zero, the message is not sent until the delay period has passed and speech has actually begun.