iOS AVSpeechSynthesizer 语音合成

1.基本使用

-(void)initAVSpeechSynthesizer{
  NSString *string = @"Hello, World!";
  //创建发声对象
  AVSpeechUtterance *utterance = [[AVSpeechUtterance alloc] initWithString:string];
 //发音语言中文zh-CN
  utterance.voice = [AVSpeechSynthesisVoice voiceWithLanguage:@"en-US"];
  utterance.rate=0.5;// 设置语速，范围0-1，注意0最慢，1最快;AVSpeechUtteranceMinimumSpeechRate最慢，AVSpeechUtteranceMaximumSpeechRate最快
  utterance.volume = 1.0;//音量
  //创建合成对象
  AVSpeechSynthesizer *speechSynthesizer = [[AVSpeechSynthesizer alloc] init];
  //开启合成播放
  [speechSynthesizer speakUtterance:utterance];
}

#pragma mark AVSpeechSynthesizerDelegate

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

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

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

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

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

}

2.后台运行

1.配置info.plist文件添加音频后台:Add on target's info.plist the key "Required background modes" to "App plays audio or streams audio/video using AirPlay".
2.还要在APPdelegate或者viewDidload或者其他合适地方添加以下代码开启后台播放

NSError *error = NULL;AVAudioSession *session = [AVAudioSession sharedInstance];
[session setCategory:AVAudioSessionCategoryPlayback error:&error];
if(error) { // Do some error handling
}
[session setActive:YES error:&error];
if (error) { // Do some error handling
}