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# AVSpeechSynthesizerDelegate

A delegate protocol that contains optional methods you can implement to respond to events that occur during speech synthesis.

```
protocol AVSpeechSynthesizerDelegate : NSObjectProtocol, Sendable
```

## Overview

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.

## Topics

### Responding to speech synthesis events

[`speechSynthesizer(_:didStart:)`](/documentation/AVFAudio/AVSpeechSynthesizerDelegate/speechSynthesizer(_:didStart:))

Tells the delegate when the synthesizer begins speaking an utterance.

[`speechSynthesizer(_:willSpeakRangeOfSpeechString:utterance:)`](/documentation/AVFAudio/AVSpeechSynthesizerDelegate/speechSynthesizer(_:willSpeakRangeOfSpeechString:utterance:))

Tells the delegate when the synthesizer is about to speak a portion of an utterance’s text.

[`speechSynthesizer(_:willSpeak:utterance:)`](/documentation/AVFAudio/AVSpeechSynthesizerDelegate/speechSynthesizer(_:willSpeak:utterance:))

Tells the delegate when the synthesizer is about to speak a marker of an utterance’s text.

[`speechSynthesizer(_:didPause:)`](/documentation/AVFAudio/AVSpeechSynthesizerDelegate/speechSynthesizer(_:didPause:))

Tells the delegate when the synthesizer pauses while speaking an utterance.

[`speechSynthesizer(_:didContinue:)`](/documentation/AVFAudio/AVSpeechSynthesizerDelegate/speechSynthesizer(_:didContinue:))

Tells the delegate when the synthesizer resumes speaking an utterance after pausing.

[`speechSynthesizer(_:didFinish:)`](/documentation/AVFAudio/AVSpeechSynthesizerDelegate/speechSynthesizer(_:didFinish:))

Tells the delegate when the synthesizer finishes speaking an utterance.

[`speechSynthesizer(_:didCancel:)`](/documentation/AVFAudio/AVSpeechSynthesizerDelegate/speechSynthesizer(_:didCancel:))

Tells the delegate when the synthesizer cancels speaking an utterance.


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