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@remato/vision-camera-code-scanner
Advanced tools
Readme
VisionCamera Frame Processor Plugin to read barcodes using MLKit Vision Barcode Scanning
yarn add vision-camera-code-scanner
make sure you correctly setup react-native-reanimated and insert as a first line of your index.tsx
import 'react-native-reanimated'
Add this to your babel.config.js
[
'react-native-reanimated/plugin',
{
globals: ['__scanCodes'],
},
]
Simply call the useScanBarcodes()
hook or call scanBarcodes()
inside of the useFrameProcessor()
hook. In both cases you will need to pass an array of BarcodeFormat
to specify the kind of barcode you want to detect.
Note: The underlying MLKit barcode reader is only created once meaning that changes to the array will not be reflected in the app.
import * as React from 'react';
import { StyleSheet, Text } from 'react-native';
import { useCameraDevices } from 'react-native-vision-camera';
import { Camera } from 'react-native-vision-camera';
import { useScanBarcodes, BarcodeFormat } from 'vision-camera-code-scanner';
export default function App() {
const [hasPermission, setHasPermission] = React.useState(false);
const devices = useCameraDevices();
const device = devices.back;
const [frameProcessor, barcodes] = useScanBarcodes([BarcodeFormat.QR_CODE], {
checkInverted: true,
});
// Alternatively you can use the underlying function:
//
// const frameProcessor = useFrameProcessor((frame) => {
// 'worklet';
// const detectedBarcodes = scanBarcodes(frame, [BarcodeFormat.QR_CODE], { checkInverted: true });
// runOnJS(setBarcodes)(detectedBarcodes);
// }, []);
React.useEffect(() => {
(async () => {
const status = await Camera.requestCameraPermission();
setHasPermission(status === 'authorized');
})();
}, []);
return (
device != null &&
hasPermission && (
<>
<Camera
style={StyleSheet.absoluteFill}
device={device}
isActive={true}
frameProcessor={frameProcessor}
frameProcessorFps={5}
zoom={device?.neutralZoom ?? 1}
/>
{barcodes.map((barcode, idx) => (
<Text key={idx} style={styles.barcodeTextURL}>
{barcode.displayValue}
</Text>
))}
</>
)
);
}
const styles = StyleSheet.create({
barcodeTextURL: {
fontSize: 20,
color: 'white',
fontWeight: 'bold',
},
});
See the contributing guide to learn how to contribute to the repository and the development workflow.
MIT
FAQs
VisionCamera Frame Processor Plugin to read barcodes using MLKit Vision Barcode Scanning
The npm package @remato/vision-camera-code-scanner receives a total of 1 weekly downloads. As such, @remato/vision-camera-code-scanner popularity was classified as not popular.
We found that @remato/vision-camera-code-scanner demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 4 open source maintainers collaborating on the project.
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