【Swift】読み上げ機能は割と簡単に使えます

import UIKit
import AVFoundation

class ViewController: UIViewController , AVSpeechSynthesizerDelegate {

    let synthesizer = AVSpeechSynthesizer()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        self.synthesizer.delegate = self
    }
    
    @IBAction func onButtonJapanese(_ sender: Any) {
        
        let utterance = AVSpeechUtterance(string: "日本語です")
        utterance.voice = AVSpeechSynthesisVoice(language: "ja-JP")
        
        //rate（読み上げの速さ） 0.0〜1.0 の範囲で設定する, defaultは0.5
        //utterance.rate = AVSpeechUtteranceMinimumSpeechRate
        //utterance.rate = AVSpeechUtteranceMaximumSpeechRate
        utterance.rate = AVSpeechUtteranceDefaultSpeechRate
        
        //読み上げの声の高さ  0.5〜2.0 の範囲で設定する, defaultは1.0
        utterance.pitchMultiplier = 1.2

        synthesizer.speak(utterance)
    }
    
    
    @IBAction func onButtonEnglish(_ sender: Any) {
        
        let utterance = AVSpeechUtterance(string: "speaking")
        utterance.voice = AVSpeechSynthesisVoice(language: "en-US")
        
        utterance.rate = AVSpeechUtteranceDefaultSpeechRate
        
        utterance.pitchMultiplier = 1.9

        synthesizer.speak(utterance)
    }
    
    
    func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didStart utterance: AVSpeechUtterance) {
       print("読み上げ開始")
    }
    
    func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didFinish utterance: AVSpeechUtterance) {
       print("読み上げ終了")
    }

}