@interface ViewController ()  <SFSpeechRecognizerDelegate>
@property (strong, nonatomic) UIButton *siriBtu;//siri按钮
@property (strong, nonatomic) UITextView *siriTextView; //显示语音转化成的文本
@property (strong, nonatomic) SFSpeechRecognitionTask *recognitionTask; //语音识别任务
@property (strong, nonatomic)SFSpeechRecognizer *speechRecognizer; //语音识别器
@property (strong, nonatomic) SFSpeechAudioBufferRecognitionRequest *recognitionRequest; //识别请求
@property (strong, nonatomic)AVAudioEngine *audioEngine; //录音引擎
@end

- (void)viewDidLoad {[super viewDidLoad];

 //设备识别语言为中文NSLocale *cale = [[NSLocale alloc]initWithLocaleIdentifier:@"zh-CN"];self.speechRecognizer = [[SFSpeechRecognizer alloc]initWithLocale:cale];self.siriBtu.enabled = false;

　　//设置代理_speechRecognizer.delegate = self;

　　//发送语音认证请求(首先要判断设备是否支持语音识别功能)[SFSpeechRecognizer requestAuthorization:^(SFSpeechRecognizerAuthorizationStatus status) {bool isButtonEnabled = false;switch (status) {case SFSpeechRecognizerAuthorizationStatusAuthorized:isButtonEnabled = true;NSLog(@"可以语音识别");break;case SFSpeechRecognizerAuthorizationStatusDenied:isButtonEnabled = false;NSLog(@"用户被拒绝访问语音识别");break;case SFSpeechRecognizerAuthorizationStatusRestricted:isButtonEnabled = false;NSLog(@"不能在该设备上进行语音识别");break;case SFSpeechRecognizerAuthorizationStatusNotDetermined:isButtonEnabled = false;NSLog(@"没有授权语音识别");break;default:break;}self.siriBtu.enabled = isButtonEnabled;}];

　　//创建录音引擎self.audioEngine = [[AVAudioEngine alloc]init];
}

- (void)microphoneTap:(UIButton *)sender {if ([self.audioEngine isRunning]) {[self.audioEngine stop];[self.recognitionRequest endAudio];self.siriBtu.enabled = YES;[self.siriBtu setTitle:@"开始录制" forState:UIControlStateNormal];}else{[self startRecording];[self.siriBtu setTitle:@"停止录制" forState:UIControlStateNormal];}
}

-(void)startRecording{if (self.recognitionTask) {[self.recognitionTask cancel];self.recognitionTask = nil;}AVAudioSession *audioSession = [AVAudioSession sharedInstance];bool  audioBool = [audioSession setCategory:AVAudioSessionCategoryRecord error:nil];bool  audioBool1= [audioSession setMode:AVAudioSessionModeMeasurement error:nil];bool  audioBool2= [audioSession setActive:true withOptions:AVAudioSessionSetActiveOptionNotifyOthersOnDeactivation error:nil];if (audioBool || audioBool1||  audioBool2) {NSLog(@"可以使用");}else{NSLog(@"这里说明有的功能不支持");}self.recognitionRequest = [[SFSpeechAudioBufferRecognitionRequest alloc]init];AVAudioInputNode *inputNode = self.audioEngine.inputNode;SFSpeechAudioBufferRecognitionRequest *recognitionRequest;self.recognitionRequest.shouldReportPartialResults = true;

　　//开始识别任务self.recognitionTask = [self.speechRecognizer recognitionTaskWithRequest:self.recognitionRequest resultHandler:^(SFSpeechRecognitionResult * _Nullable result, NSError * _Nullable error) {bool isFinal = false;if (result) {self.siriTextView.text = [[result bestTranscription] formattedString]; //语音转文本isFinal = [result isFinal];}if (error || isFinal) {[self.audioEngine stop];[inputNode removeTapOnBus:0];self.recognitionRequest = nil;self.recognitionTask = nil;self.siriBtu.enabled = true;}}];AVAudioFormat *recordingFormat = [inputNode outputFormatForBus:0];[inputNode installTapOnBus:0 bufferSize:1024 format:recordingFormat block:^(AVAudioPCMBuffer * _Nonnull buffer, AVAudioTime * _Nonnull when) {[self.recognitionRequest appendAudioPCMBuffer:buffer];}];    [self.audioEngine prepare];bool audioEngineBool = [self.audioEngine startAndReturnError:nil];NSLog(@"%d",audioEngineBool);self.siriTextView.text = @"我是小冰！Siri 冰，你说我听";
}

-(void)speechRecognizer:(SFSpeechRecognizer *)speechRecognizer availabilityDidChange:(BOOL)available{if(available){self.siriBtu.enabled = true;}else{self.siriBtu.enabled = false;}
}