Test the built-in voice speech on iOS

AVSpeechSynthesisVoiceTest.swift

let allVoices =  AVSpeechSynthesisVoice.speechVoices().filter { theVoice in
    theVoice.language.contains("zh")
}

for idx in allVoices.indices {
    let theVoice = allVoices[idx]
    let lang = theVoice.language
    let gender: String
    if theVoice.gender == .male {
        gender = "male"
    } else if theVoice.gender == .female {
        gender = "famale"
    } else {
        gender = "none"
    }
    print(".... [\(idx)] = \(gender) \(theVoice.identifier) \(lang)")

    let utterance = AVSpeechUtterance(string: "归零归零清除归零 1 2 3 4 5 6 7 8 9 十 百 千 万 亿 + - * /")
    utterance.voice = AVSpeechSynthesisVoice(identifier: theVoice.identifier)
    synthesizer.speak(utterance)
}