React Native speech recognition component for iOS 10+

$ npm install react-native-speech-to-text-ios --save

$ react-native link react-native-speech-to-text-ios

Also, you need open the React Native xCode project and add two new keys into Info.plist Just right click on Info.plist -> Open As -> Source Code and paste these strings somewhere into root <dict> tag

<key>NSSpeechRecognitionUsageDescription</key>
<string>Your usage description here</string>
<key>NSMicrophoneUsageDescription</key>
<string>Your usage description here</string>

Application will crash if you don't do this.

import {
  ...
  NativeAppEventEmitter,
  ...
} from 'react-native';

var SpeechToText = require('react-native-speech-to-text-ios');

...

this.subscription = NativeAppEventEmitter.addListener(
  'SpeechToText',
  (result) => {

    if (result.error) {
      alert(JSON.stringify(result.error));
    } else {
      console.log(result.bestTranscription.formattedString);
    }
	
  }
);

SpeechToText.startRecognition("en-US");

...

componentWillUnmount() {
  if (this.subscription != null) {
    this.subscription.remove();
    this.subscription = null;
  }
}

To stop recording call SpeechToText.finishRecognition() but after that you can continue to receive event with final recognition results. The events will not arrive after result.isFinal == true. Call SpeechToText.stopRecognition() to cancel current recognition task. The result objects reflects Apple SFSpeechRecognitionResult class.

Use this link to reference error codes https://developer.nuance.com/public/Help/DragonMobileSDKReference_iOS/Error-codes.html