AVSpeechUtterance是iOS中语音合成的类。
AVSpeechUtterance *utterance = [AVSpeechUtterance speechUtteranceWithString:@"Hello World"]; //创建语音 Hello World 合成的文本
utterance.voice = [AVSpeechSynthesisVoice voiceWithLanguage:@"en-US"]; //合成英文 嗓音属性
utterance.rate = 0.5f; // 播放速率
utterance.pitchMultiplier = 0.8f; //改变音调
utterance.postUtteranceDelay = 0.1f; //播放下一句是有个短时间的暂停
AVSpeechSynthesizer *av = [[AVSpeechSynthesizer alloc] init]; //运用合成器
[av speakUtterance:utterance]; //变成音频输出
输入iOS支持的语言
[AVSpeechSynthesisVoice speechVoices];
