#import <AVFoundation/AVSpeechSynthesis.h>

//遵循代理 AVSpeechSynthesizerDelegate

// 文本读语音方法 stra是要读的文本

- (void)boFangTextWithString:(NSString *)stra

{

    //初始化语音合成器

    _avSpeaker = [[AVSpeechSynthesizer alloc] init];

    _avSpeaker.delegate = self;

    //初始化要说出的内容

    AVSpeechUtterance *utterance = [[AVSpeechUtterance alloc] initWithString:stra];

    //设置语速,语速介于AVSpeechUtteranceMaximumSpeechRate和AVSpeechUtteranceMinimumSpeechRate之间

    //AVSpeechUtteranceMaximumSpeechRate

    //AVSpeechUtteranceMinimumSpeechRate

    //AVSpeechUtteranceDefaultSpeechRate

    utterance.rate = 0.5;

    //设置音高,[0.5 - 2] 默认 = 1

    //AVSpeechUtteranceMaximumSpeechRate

    //AVSpeechUtteranceMinimumSpeechRate

    //AVSpeechUtteranceDefaultSpeechRate

    utterance.pitchMultiplier = ;

    //设置音量,[0-1] 默认 = 1

    utterance.volume = ;

    //读一段前的停顿时间

    utterance.preUtteranceDelay = ;

    //读完一段后的停顿时间

    utterance.postUtteranceDelay = ;

    //设置声音,是AVSpeechSynthesisVoice对象

    //AVSpeechSynthesisVoice定义了一系列的声音, 主要是不同的语言和地区.

    //voiceWithLanguage: 根据制定的语言, 获得一个声音.

    //speechVoices: 获得当前设备支持的声音

    //currentLanguageCode: 获得当前声音的语言字符串, 比如”ZH-cn”

    //language: 获得当前的语言

    //通过特定的语言获得声音

    AVSpeechSynthesisVoice *voice = [AVSpeechSynthesisVoice voiceWithLanguage:@"zh-CN"];

    //通过voicce标示获得声音

    //AVSpeechSynthesisVoice *voice = [AVSpeechSynthesisVoice voiceWithIdentifier:AVSpeechSynthesisVoiceIdentifierAlex];

    utterance.voice = voice;

    //开始朗读

    [_avSpeaker speakUtterance:utterance];

}

#pragma mark - AVSpeechSynthesizerDelegate

//已经开始

- (void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer didStartSpeechUtterance:(AVSpeechUtterance *)utterance{

}

//已经说完

- (void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer didFinishSpeechUtterance:(AVSpeechUtterance *)utterance{

    //如果朗读要循环朗读，可以在这里再次调用朗读方法

    //[_avSpeaker speakUtterance:utterance];

}

//已经暂停

- (void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer didPauseSpeechUtterance:(AVSpeechUtterance *)utterance{

}

//已经继续说话

- (void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer didContinueSpeechUtterance:(AVSpeechUtterance *)utterance{

}

//已经取消说话

- (void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer didCancelSpeechUtterance:(AVSpeechUtterance *)utterance{

}

//将要说某段话

- (void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer willSpeakRangeOfSpeechString:(NSRange)characterRange utterance:(AVSpeechUtterance *)utterance{

}