[speechSynthesizer stopSpeakingAtBoundary:AVSpeechBoundaryImmediate];
utterance = [[AVSpeechUtterance alloc] initWithString:textView.text];
utterance.voice = [AVSpeechSynthesisVoice voiceWithLanguage:@"ja-JP"];
fRate -= 0.1f;
utterance.rate = fRate;
[speechSynthesizer speakUtterance:utterance];
Up to ios 10 was read aloud immediately after execution,
It takes about 4 minutes to execute from ios 11bata at least.
I do not think there will be any API changes, but please let me know how to deal with it.
I am in trouble because it is a function for the visually impaired