@interface ViewController () <SFSpeechRecognizerDelegate>
@property (strong, nonatomic) UIButton *siriBtu;
@property (strong, nonatomic) UITextView *siriTextView;
@property (strong, nonatomic) SFSpeechRecognitionTask *recognitionTask;
@property (strong, nonatomic)SFSpeechRecognizer *speechRecognizer;
@property (strong, nonatomic) SFSpeechAudioBufferRecognitionRequest *recognitionRequest;
@property (strong, nonatomic)AVAudioEngine *audioEngine;
@end

- (void)viewDidLoad {
[super viewDidLoad];
NSLocale *cale = [[NSLocale alloc]initWithLocaleIdentifier:@"zh-CN"];
self.speechRecognizer = [[SFSpeechRecognizer alloc]initWithLocale:cale];
self.siriBtu.enabled = false;
_speechRecognizer.delegate = self;
[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;
}];
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;
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];
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;
}
}