AVSpeechSynthesizerDelegate
A delegate protocol that contains optional methods you can implement to respond to events that occur during speech synthesis.
Declaration
protocol AVSpeechSynthesizerDelegate : NSObjectProtocol, SendableOverview
A speech synthesizer sends messages to its delegate for three categories of events:
The synthesizer starts or finishes speaking an utterance.
Speech pauses or resumes.
The synthesizer produces each individual unit of speech, which is generally a word.