import AVFoundation

let player = AVSpeechSynthesizer();
player.delegate = self;
let u = AVSpeechUtterance(string: "今天天气不错");
u.voice = AVSpeechSynthesisVoice(language: "zh-CN");
u.volume = 1.0;//音量 [0-1] Default = 1
u.rate = 0.48;//播放速度
u.pitchMultiplier = 1.0;//播放基准音调 [0.5 - 2] Default = 1
player.speakUtterance(u);

//开始播放
func (synthesizer: AVSpeechSynthesizer,didStartSpeechUtterance utterance: AVSpeechUtterance) {
    print("开始播放")
}

//播放中
func (synthesizer: AVSpeechSynthesizer,willSpeakRangeOfSpeechString characterRange: NSRange,utterance: AVSpeechUtterance) {
    let process = Double(characterRange.location) / Double(utterance.speechString.characters.count);
    print("播放中，播放进度为:(process)")
}

//播放完毕
func (synthesizer: AVSpeechSynthesizer,didFinishSpeechUtterance utterance: AVSpeechUtterance) {
    print("播放完毕")
}

//停止播放
player.stopSpeakingAtBoundary(AVSpeechBoundary.Immediate);
//暂停播放
player.pauseSpeakingAtBoundary(AVSpeechBoundary.Immediate);