AVSpeechSynthesizer的话语率在iOS7＆amp; iOS 9

Question

问题：在iOS 7.x和iOS 8.x中，此代码工作正常，但在iOS 9.x中，与iOS 7中的语音速率相比，语速变慢。 8。

self.synthesizer = [[AVSpeechSynthesizer alloc] init];

self.synthesizer.delegate = self;

AVSpeechUtterance *utterance = [[AVSpeechUtterance alloc] initWithString:[NSString stringWithFormat:@"Hey %@, please choose places to explore or select excursions to see our custom crafted deals",[defaults objectForKey:@"USERNAME"]]];

utterance.voice = [AVSpeechSynthesisVoice voiceWithLanguage:@"en-US"];

utterance.rate = 0.10;

[self.synthesizer speakUtterance:utterance]; 

Answer 1

[utterance setRate: 0.5f];将完成这项工作