Tells the delegate when the synthesizer is about to speak a portion of an utterance’s text.
- 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 range of characters in the utterance’s
speechcorresponding to the unit of speech about to be spoken.
The utterance currently being spoken.
Because this delegate message is sent once for each unit of speech (generally, a word) in the utterance’s text, you can use it for such purposes as highlighting each word onscreen as it is spoken.