objective-c - iOS7 和 iOS 9 中的 AVSpeechSynthesizer 发音率不同

Question

问题:在 iOS 7.x 和 iOS 8.x 中，此代码运行良好，但与 iOS 7 和 8 中的语音速率相比，在 iOS 9.x 中的语音速率越来越慢。

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