问题描述
HI有没有人在iOS 8上试过AvSpeechSynthesizer？
我在Xcode 6上做了快速的应用程序，但没有音频出来，我在Xcode 5上运行同样的工作并且没有任何障碍。
HI did anyone tried AvSpeechSynthesizer on iOS 8 ?I did quick app on Xcode 6 but no audio comes out, I ran the same on on the Xcode 5 and works without a hitch.
示例代码来自
NSString *string = @"Hello, World!";
AVSpeechUtterance *utterance = [[AVSpeechUtterance alloc] initWithString:string];
utterance.voice = [AVSpeechSynthesisVoice voiceWithLanguage:@"en-US"];
AVSpeechSynthesizer *speechSynthesizer = [[AVSpeechSynthesizer alloc] init];
[speechSynthesizer speakUtterance:utterance];
Xcode6的错误？
Bug with Xcode6?
==编辑===
看起来像iOS 8 sim的bug /问题，带有Xcode6的iOS7.1 Sim工作正常..
== Edit ===Looks like bug/issue with iOS 8 sim, iOS7.1 Sim with Xcode6 works fine..
推荐答案
是的，这是一个错误。从iOS8 GM开始，似乎首次尝试让AVSpeechSynthesizer说AVSpeechUtterance会导致沉默。
Yup, its a bug. As of iOS8 GM, it seems the first attempt to get AVSpeechSynthesizer to speak an AVSpeechUtterance will result in silence.
我的解决方法是让AVSpeechSynthesizer在初始化后立即说一个单字符的话语。这将是静默的，之后您的AVSpeechSynthesizer将正常工作。
My workaround is to make AVSpeechSynthesizer speak a single-character utterance immediately after it is initialized. This will be silent, and afterwards your AVSpeechSynthesizer will work as normal.
AVSpeechUtterance *bugWorkaroundUtterance = [AVSpeechUtterance speechUtteranceWithString:@" "];
bugWorkaroundUtterance.rate = AVSpeechUtteranceMaximumSpeechRate;
[self.speechSynthesizer speakUtterance:bugWorkaroundUtterance];
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