Tells the delegate when the synthesizer has finished 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 finished being spoken.
This message is sent immediately when speech ends; it is not postponed if the final utterance’s
post is greater than zero.