text 文本到语音的api ios

Posted 2021-04-29

import UIKit
import AVFoundation
import PlaygroundSupport

var str = "Turning to Right"

let synthesizer = AVSpeechSynthesizer()
let utterance = AVSpeechUtterance(string: str)
utterance.rate = 0.39 // more the rate more faster words will be uttered
utterance.voice = AVSpeechSynthesisVoice(language: "en-US") // fr-FR  en-US // hub of all codes:- https://gist.github.com/vitoziv/9108407

//for playground only
let playerViewController = AVPlayerViewController()
PlaygroundPage.current.liveView = playerViewController.view
//

synthesizer.speak(utterance)

// instructions to enable sound in background mode
1. tick the Audio, Airplay, and Picture in Picture functionality in background mode 
2. add the following line in viewWillAppear function
    override func viewWillAppear(_ animated: Bool) {
        try? AVAudioSession.sharedInstance().setCategory(AVAudioSession.Category.playback)
    }
3. enclose your code of synthesizer.speak()  to other in 
DispatchQueue.global().sync {
}

to run in global main thread.

ENJOY!!