Simple Speech into Text in IPhone - objective-c

Question

I am trying to developing the app like speech into text , i want to convert the speech into a text in textfield .I have searched in google i got some sample code but that is not useful.i got these link,raywenderlinch,but in this they mentioned some API is used for speech reconginization ,but i cant able to get that.
Please anyone can share a tutorial with the sample project it might be very useful to me .
Thanks in advance !!!

Answer 1

- (void) viewDidAppear:(BOOL)animated {
_recognizer = [[SFSpeechRecognizer alloc] initWithLocale:[NSLocale localeWithLocaleIdentifier:#"en-US"]];
[_recognizer setDelegate:self];
[SFSpeechRecognizer requestAuthorization:^(SFSpeechRecognizerAuthorizationStatus authStatus) {
switch (authStatus) {
case SFSpeechRecognizerAuthorizationStatusAuthorized:
//User gave access to speech recognition
NSLog(#"Authorized");
break;
case SFSpeechRecognizerAuthorizationStatusDenied:
//User denied access to speech recognition
NSLog(#"SFSpeechRecognizerAuthorizationStatusDenied");
break;
case SFSpeechRecognizerAuthorizationStatusRestricted:
//Speech recognition restricted on this device
NSLog(#"SFSpeechRecognizerAuthorizationStatusRestricted");
break;
case SFSpeechRecognizerAuthorizationStatusNotDetermined:
//Speech recognition not yet authorized
break;
default:
NSLog(#"Default");
break;
}
}];
audioEngine = [[AVAudioEngine alloc] init];
_speechSynthesizer = [[AVSpeechSynthesizer alloc] init];
[_speechSynthesizer setDelegate:self];
}
-(void)startRecording
{
[self clearLogs:nil];
NSError * outError;
AVAudioSession *audioSession = [AVAudioSession sharedInstance];
[audioSession setCategory:AVAudioSessionCategoryRecord error:&outError];
[audioSession setMode:AVAudioSessionModeMeasurement error:&outError];
[audioSession setActive:true withOptions:AVAudioSessionSetActiveOptionNotifyOthersOnDeactivation error:&outError];
request2 = [[SFSpeechAudioBufferRecognitionRequest alloc] init];
inputNode = [audioEngine inputNode];
if (request2 == nil) {
NSLog(#"Unable to created a SFSpeechAudioBufferRecognitionRequest object");
}
if (inputNode == nil) {
NSLog(#"Unable to created a inputNode object");
}
request2.shouldReportPartialResults = true;
_currentTask = [_recognizer recognitionTaskWithRequest:request2
delegate:self];
[inputNode installTapOnBus:0 bufferSize:4096 format:[inputNode outputFormatForBus:0] block:^(AVAudioPCMBuffer *buffer, AVAudioTime *when){
NSLog(#"Block tap!");
[request2 appendAudioPCMBuffer:buffer];
}];
[audioEngine prepare];
[audioEngine startAndReturnError:&outError];
NSLog(#"Error %#", outError);
}
- (void)speechRecognitionTask:(SFSpeechRecognitionTask *)task didFinishRecognition:(SFSpeechRecognitionResult *)result {
NSLog(#"speechRecognitionTask:(SFSpeechRecognitionTask *)task didFinishRecognition");
NSString * translatedString = [[[result bestTranscription] formattedString] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
[self log:translatedString];
if ([result isFinal]) {
[audioEngine stop];
[inputNode removeTapOnBus:0];
_currentTask = nil;
request2 = nil;
}
}