Objective C

AVSpeechSynthesizer *synthesizer = [[AVSpeechSynthesizer alloc]init];
AVSpeechUtterance *utterance = [AVSpeechUtterance speechUtteranceWithString:@"Some text"];
[utterance setRate:0.2f];
[synthesizer speakUtterance:utterance];

Swift

let synthesizer = AVSpeechSynthesizer()
let utterance = AVSpeechUtterance(string: "Some text")
utterance.rate = 0.2

You can also change the voice like this :

utterance.voice = AVSpeechSynthesisVoice(language: "fr-FR")

And then speek

• In Swift 2 : synthesizer.speakUtterance(utterance)
• In Swift 3 : synthesizer.speak(utterance)

Don't forget to import AVFoundation

Helpful methods

You can Stop or Pause all speech using these two methods :

- (BOOL)pauseSpeakingAtBoundary:(AVSpeechBoundary)boundary;
- (BOOL)stopSpeakingAtBoundary:(AVSpeechBoundary)boundary;

The AVSpeechBoundary indicates if the speech should pause or stop immediately (AVSpeechBoundaryImmediate) or it should pause or stop after the word currently being spoken (AVSpeechBoundaryWord).