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iosspeech

Register for Text-To-Speech callback with AVSpeechSynthesizer

I am using Text to speech in iOS 7 (AVSpeechUtterance).

Is there a way to register a callback which will be invoked upon completion of speech?

I need to know so that I can disable a play button while speech is running and re-enable the button when the speech is done.

Solution

  • According to the Apple Doc, An AVSpeechUtterance is the basic unit of speech synthesis.

    AVSpeechSynthesizer has a delegate : AVSpeechSynthesizerDelegate. This protocol contains interesting methods able to solve your problem. I quote:

    In Swift : 

    speechSynthesizer(_:didCancelSpeechUtterance:)
speechSynthesizer(_:didContinueSpeechUtterance:)
speechSynthesizer(_:didFinishSpeechUtterance:)
speechSynthesizer(_:didPauseSpeechUtterance:)
speechSynthesizer(_:didStartSpeechUtterance:)
speechSynthesizer(_:willSpeakRangeOfSpeechString:utterance:)

    In Objective C

    speechSynthesizer:didCancelSpeechUtterance:
speechSynthesizer:didContinueSpeechUtterance:
speechSynthesizer:didFinishSpeechUtterance:
speechSynthesizer:didPauseSpeechUtterance:
speechSynthesizer:didStartSpeechUtterance:
speechSynthesizer:willSpeakRangeOfSpeechString:utterance:

    Take a look on the Apple Doc