iOS 16语音播放问题 AVSpeechSynthesizer

之前用OC一直不能播放声音，改为用swift就可以播放声音啦

   let utterance =AVSpeechUtterance(string: text)

   utterance.voice = AVSpeechSynthesisVoice(language: AVSpeechSynthesisVoice.currentLanguageCode())

   utterance.rate=0.5

  utterance.volume=0.8

   utterance.pitchMultiplier=0.1

  self.synthesizer.speak(utterance)