Hooks for React Native Camera

 

React Native Camera Hooks provides you with functionality to use the React Native Camera API with Functional Components.

 

import { View, TouchableOpacity, TouchableWithoutFeedback } from 'react-native';
import { RNCamera } from 'react-native-camera';
import { useCamera } from 'react-native-camera-hooks';

const FunctionalComponentExample = ({ initialProps }) => {
  const [
    { cameraRef, type, ratio, autoFocus, autoFocusPoint, isRecording },
    {
      toggleFacing,
      touchToFocus,
      textRecognized,
      facesDetected,
      recordVideo,
      setIsRecording,
    },
  ] = useCamera(initialProps);

  return (
    <View style={{ flex: 1 }}>
      <RNCamera
        ref={cameraRef}
        autoFocusPointOfInterest={autoFocusPoint.normalized}
        type={type}
        ratio={ratio}
        style={{ flex: 1 }}
        autoFocus={autoFocus}
        onTextRecognized={textRecognized}
        onFacesDetected={facesDetected}
      />

      <TouchableWithoutFeedback
        style={{
          flex: 1,
        }}
        onPress={touchToFocus}
      />

      <TouchableOpacity
        testID="button"
        onPress={toggleFacing}
        style={{ width: '100%', height: 45 }}>
        {type}
      </TouchableOpacity>

      {!isRecording && (
        <TouchableOpacity
          onPress={async () => {
            try {
              setIsRecording(true);
              const data = await recordVideo();
              console.warn(data);
            } catch (error) {
              console.warn(error);
            } finally {
              setIsRecording(false);
            }
          }}
          style={{ width: '100%', height: 45 }}
        />
      )}
    </View>
  );
};

Features

• React Hooks Support: Use React Native Camera with Functional Components
• Wrapper around the Camera API, that makes the usage easier
• TypeScript support

Constants are defined in constants and initalState.

Function	Description
useCamera(initialState)	Includes all camera hooks described below. See also the example above
useZoom(state)	Zoom feature. Includes zoom, setZoom, zoomIn (increment by 0.01) and zoomOut (decrement by 0.1)
useToggleFacing(state, modes)	Toggles between two values (front and back side of the camera). Includes type, toggleFacing.
useAutoFocus(state, modes)	Toggles between two values (focus on or off). Includes autoFocus and toggleAutoFocus.
useWhiteBalance(state)	Toggles between white balance values. Includes whiteBalance, toggleWB and setWhiteBalance.
useFlash(state)	Toggles between flash modes. Includes flash, toggleFlash and setFlash.
useAutoFocusTouch(state)	Touch to focus feature. Includes autoFocusPoint, touchToFocus (callback to be used in onPress for example) and setAutoFocusPoint.
useTextRecognition(state)	Text recognition feature. Includes textBlocks, setTextblocks and textRecognized (callback).
useFaceDetection(state)	Face detection feature. Includes faces, setFaces and facesDetected (callback).
useBarcodeDetection(state)	Barcode detection feature. Includes barcodes, setBarcodes and barcodeRecognized (callback).
takePicture({ cameraRef }, options)	Function to take a picture. Returns a Promise with the result. defaultPictureTakeOptions can also be imported from the same file.
recordVideo({ cameraRef }, options)	Function to record a video. Returns a Promise with the result. defaultVideoRecordOptions can also be imported from the same file.
stopRecording({ cameraRef })	Function to stop recording. Returns a Promise.
pausePreview({ cameraRef })	Function to pause the camera preview. Returns a Promise with the result as a boolean.
resumePreview({ cameraRef })	Function to resume the camera preview. Returns a Promise with the result as a boolean.

 

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Installation

To install react-native-camera-hooks, do either

npm install --save react-native-camera-hooks

or

yarn add react-native-camera-hooks

Note that this requires a react-native version > 0.59 which supports React Hooks. Also, react-native-camera has to be installed.

 

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TODO

• Improve TypeScript support