Speech synthesis
Configure voices to speak strings of text.
Overview
The Speech Synthesis framework manages voice and speech synthesis, and requires two primary tasks:
Create an AVSpeechUtterance instance that contains the text to speak. Optionally, configure speech parameters, such as voice and rate, for each utterance.
// Create an utterance.
let utterance = AVSpeechUtterance(string: "The quick brown fox jumped over the lazy dog.")
// Configure the utterance.
utterance.rate = 0.57
utterance.pitchMultiplier = 0.8
utterance.postUtteranceDelay = 0.2
utterance.volume = 0.8
// Retrieve the British English voice.
let voice = AVSpeechSynthesisVoice(language: "en-GB")
// Assign the voice to the utterance.
utterance.voice = voicePass the utterance to an AVSpeechSynthesizer instance to produce spoken audio.
// Create a speech synthesizer.
let synthesizer = AVSpeechSynthesizer()
// Tell the synthesizer to speak the utterance.
synthesizer.speak(utterance)Optionally, use the speech synthesizer instance to control or respond to ongoing speech; for example, assign its delegate to receive speech event notifications.