问题
I use AVSpeechSynthesizer and AVSpeechUtterance for text-to-speech. It works fine, but the User must enable SpeakSelection feature in his/her device's accessibility settings. Is there a way to do it for them, or at least check the settings and warn them?
回答1:
Maybe you can try to say something, attach delegate and measure duration of speaking. If duration of speaking out yours text is near zero, user should check settings/download voice or so!
来源：https://stackoverflow.com/questions/26181764/using-avspeechsynthesizer-avspeechutterance-for-text-to-speech-will-not-work-if