react-native 实现扫码功能 基于 vision-camera-code-scanner、react-native-vision-camera、react-native-reanimated

要在React Native中使用vision-camera-code-scanner实现扫码功能，首先需要安装所需的库：

npm install react-native-vision-camera
npm install @react-native-vision-camera/code-scanner

确保你的React Native项目已经正确配置了原生环境。

以下是一个简单的示例，展示如何在React Native应用中使用vision-camera-code-scanner库来实现扫码功能：

import React, { useEffect, useState } from 'react';
import { Text, View, StyleSheet, Button } from 'react-native';
import { VisionCameraScanner } from '@react-native-vision-camera/scanner';
import { BarCodeScanner } from '@react-native-vision-camera/code-scanner';
 
export default function App() {
  const [scanner, setScanner] = useState(null);
 
  useEffect(() => {
    (async () => {
      const camera = new VisionCameraScanner();
      camera.start();
      setScanner(camera);
    })();
  }, []);
 
  const handleBarCodeScanned = ({ data }) => {
    // 扫码成功后的操作
    console.log('Barcode scanned', data);
  };
 
  const scanBarCode = async () => {
    if (scanner) {
      await scanner.start();
      try {
        const { barcodes } = await scanner.receiveFrame();
        console.log(barcodes);
      } finally {
        await scanner.stop();
      }
    }
  };
 
  return (
    <View style={styles.container}>
      <Button title="Scan Barcode" onPress={scanBarCode} />
      <BarCodeScanner
        camera={scanner}
        onBarCodeScanned={handleBarCodeScanned}
        style={StyleSheet.absoluteFillObject}
      />
    </View>
  );
}
 
const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
  },
});

在这个例子中，我们首先创建了一个VisionCameraScanner实例，然后在一个按钮点击事件中开始扫描。扫码成功后，我们通过onBarCodeScanned回调函数来处理扫描结果。这个例子展示了如何在React Native应用中实现基本的扫码功能。