AVSpeechSynthesisVoice test

tts.swift

//: A Cocoa based Playground to present user interface

import AVFoundation
let voices = AVSpeechSynthesisVoice.speechVoices().reduce([String:[AVSpeechSynthesisVoice]]()) { (result, voice) -> [String:[AVSpeechSynthesisVoice]] in
    var voices = result
    let locale = Locale(identifier: voice.language)
    let code = locale.localizedString(forLanguageCode: locale.languageCode!) ?? "??"
    var voiceOnLanguage = voices[code] ?? []
    voiceOnLanguage.append(voice)
    voices[code] = voiceOnLanguage
    
    return voices
}
let languages = voices.keys.map{String($0)}

extension AVSpeechSynthesisVoice {
    func speech(text: String) {
        let utterance = AVSpeechUtterance(string: text)
         utterance.voice = self

        let synth = AVSpeechSynthesizer()
        synth.speak(utterance)
    }
}

import SwiftUI
struct ContentView: View {
    @State private var selectedLanguage = languages.first!
    @State private var selectedVoice = voices[languages.first!]!.first!
    @State private var text = """
hello, world
你好，世界！
Hallo Welt!
¡Hola, mundo!
今日は、世界
"""
    var body: some View {
        VStack {
            Picker(selection: $selectedLanguage, label: Text("language")) {
                ForEach(languages, id: \.self) { (language) in
                    Text(language)
                }
            }
            Picker(selection: $selectedVoice, label: Text("voice")) {
                ForEach(voices[selectedLanguage]!, id: \.self) { (voice) in
                    Text(voice.name)
                }
            }
            TextField("text", text: $text).lineLimit(5)
            Button("speech") {
                self.selectedVoice.speech(text: self.text)
            }
        }
    }
}

import PlaygroundSupport
PlaygroundPage.current.setLiveView(ContentView())