作用：

用文本转化成语音。例如输入文本“hello world"，则系统语音读出来

---

前提引入

#import <AVFoundation/AVFoundation.h>

/**
 核心代码
 */
-(void)func_textToVoice
{
    NSLog(@"开始转化语音");
    
    //要转化的文本
    NSString * text = self.array_text[0];
    
    //语言配置类
    AVSpeechUtterance * utterance = [[AVSpeechUtterance alloc]initWithString:text];
    utterance.voice = [AVSpeechSynthesisVoice voiceWithLanguage:@"zh-CH"];
    //TODO...
    
    //语音合成器
    [self.synthesizer speakUtterance:utterance];
}

批量转化语音

/**
 多条文本转换语音
 */
-(void)func_moreTextsToVoice
{
    self.array_text = @[
                        @"除夕更阑人不睡，厌禳钝滞迎新岁；",
                        @"小儿呼叫走长街，云有痴呆召人买。",
                        @"二物于人谁独无？就中吴侬仍有余；",
                        @"巷南巷北卖不得，相逢大笑相揶揄。",
                        @"栎翁块坐重帘下，独要买添令问价。",
                        @"儿云翁买不须钱，奉赊痴呆千百年。",
                        ];
    for(int i=0;i<self.array_text.count;i++)
    {
        AVSpeechUtterance * utterance = [[AVSpeechUtterance alloc]initWithString:array_text[i]];
        utterance.voice = [AVSpeechSynthesisVoice voiceWithLanguage:@"zh-CN"];
//        utterance.postUtteranceDelay = 0.1f;
//        utterance.preUtteranceDelay = 0.5f;
        utterance.pitchMultiplier = 0.8f;
        //TODO...

        [self.synthesizer speakUtterance:utterance];
    }

}

设置语言属性，如音调、前后延迟间隔、语速、音量等

/**
 个性化配置语音
 */
-(void)func_configVoice
{
    //要转化的文本
    NSString * text = self.array_text[0];
    
    //语言配置类
    AVSpeechUtterance * utterance = [[AVSpeechUtterance alloc]initWithString:text];
    //定制语种
    utterance.voice = [AVSpeechSynthesisVoice voiceWithLanguage:@"zh-CH"];
    //定制基线音调，范围0.5～2.0，默认1.0
    utterance.pitchMultiplier = 1.0;
    //定制语速,建议用常量来控制范围 AVSpeechUtteranceMinimumSpeechRate AVSpeechUtteranceMaximumSpeechRate AVSpeechUtteranceDefaultSpeechRate.
    utterance.rate = AVSpeechUtteranceDefaultSpeechRate;
    //定制音量
    utterance.volume = 1.0;
    //该语音播放完后延迟时间再播放下一个
    utterance.postUtteranceDelay = 0.5f;
    //等待延迟时间再进行播放
    utterance.preUtteranceDelay = 0.1;
    //TODO...
    
    //语音合成器
    [self.synthesizer speakUtterance:utterance];
}

语音合成事件协议

#pragma AVSpeechSynthesizerDelegate
-(void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer didStartSpeechUtterance:(AVSpeechUtterance *)utterance
{
    NSLog(@"语音合成开始");
}
-(void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer didPauseSpeechUtterance:(AVSpeechUtterance *)utterance
{
    NSLog(@"语音合成暂停");
}
-(void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer didCancelSpeechUtterance:(AVSpeechUtterance *)utterance
{
    NSLog(@"语音合成取消");
}
-(void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer didFinishSpeechUtterance:(AVSpeechUtterance *)utterance
{
    NSLog(@"语音合成完成");
}
-(void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer willSpeakRangeOfSpeechString:(NSRange)characterRange utterance:(AVSpeechUtterance *)utterance
{
    NSLog(@"语音合成即将播放第%lu个字长度为%lu",(unsigned long)characterRange.location,(unsigned long)characterRange.length);
}

暂停

/**
 暂停语音播放
 */
-(void)func_pauseVoice
{
    if(self.synthesizer.speaking)
    {
        [self.synthesizer pauseSpeakingAtBoundary:AVSpeechBoundaryImmediate];//立即停止
        [self.synthesizer pauseSpeakingAtBoundary:AVSpeechBoundaryWord];//读完停止
    }
}

继续

/**
 继续播放
 */
-(void)func_continueSpeaking
{
    if(self.synthesizer.paused)
    {
        [self.synthesizer continueSpeaking];
    }
}

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