In my app I have: let utterance = AVSpeechUtterance(string: recognizedTextView.text) utterance.voice = AVSpeechSynthesisVoice(language: "zh-HK") utterance.rate = 0.3 synthesizer.speak(utterance) However, after I upgraded my iOS to 17.1.1 the speed doesn't get adjusted. I tried 0.01 and 0.3 for rate, and there is no difference.

I tried to change my code from let urlString = Bundle.main.path(forResource: "X", ofType: "mp3")! to let urlString = Bundle.main.path(forResource: "X", ofType: "caf")! after I already uploaded the file. But it throws a fatal error: Unexpectedly found nil while unwrapping an Optional value I double check the filename and it's correct. and the caf file does play.