《ReactNative》扫描二维码以及识别相册二维码

用react-native-camera 库可以实现用相机扫描二维码的功能

用react-native-image-crop-picker库选取相册二维码图片

用react-native-local-barcode-recognizer解析二维码图片

如果只需要扫描二维码，不需要识别相册中的二维码图片，只安装react-native-camera库就好

install

npm install react-native-camera
npm install react-native-image-crop-picker
npm install react-native-local-barcode-recognizer

link

react-native link react-native-camera
react-native link react-native-image-crop-picker
react-native link react-native-local-barcode-recognizer

 效果

 

源码：

import React,{Component} from 'react'
import{
  View,Animated,Easing,
  Image,TouchableOpacity,
  StyleSheet,
  Text
} from 'react-native'
import { RNCamera } from 'react-native-camera'
import ImagePicker from 'react-native-image-crop-picker'
import LocalBarcodeRecognizer from 'react-native-local-barcode-recognizer'
export default class Scan extends Component{
  constructor(props) {
    super(props);
    this.state = {
      moveAnim: new Animated.Value(0),
      data: '',
    };
  }
  componentDidMount() {
      this.startAnimation();
  }
  startAnimation = () => {
    this.state.moveAnim.setValue(0);
    Animated.timing(
        this.state.moveAnim,
        {
            toValue: -200,
            duration: 1500,
            easing: Easing.linear
        }
    ).start(() => this.startAnimation());
  };
  //  识别二维码
  onBarCodeRead = (result) => {
    if(this.state.data) return
    const {data} = result;
    alert('扫描结果:'+data)
    if(data) this.setState({data}
  };
  _pickerImg(){
    ImagePicker.openPicker({
      width: 300,
      height: 300,
      cropping: false,
      includeBase64:true
    }).then(image => {
		this._handleImage(image);
    });
  }
  _handleImage(image){
    if(image.data){
      this.recoginze(image.data)
    }
  }
  recoginze = async (data)=>{
    let result = await LocalBarcodeRecognizer.decode(data.replace("data:image/jpeg;base64,",""),{codeTypes:['ean13','qr']});
    alert('识别结果：'+result);
  }

  render() {
    return (
      
         {
                this.camera = ref;
            }}
            style={styles.preview}
            type={RNCamera.Constants.Type.back}
            flashMode={RNCamera.Constants.FlashMode.on}
            onBarCodeRead={this.onBarCodeRead}
        >
          
            
            
            
            将二维码放入框内，即可自动扫描
          
          this._pickerImg()}>
            相册
          
        
      
    );
  }
}
const styles = StyleSheet.create({
  btnText: {color:'white', fontSize:16},
  btnView: {position:'absolute',right:30,top:50},
    container: {
        flex: 1,
        flexDirection: 'row'
    },
    preview: {
        flex: 1,
        justifyContent: 'flex-end',
        alignItems: 'center'
    },
    rectangleContainer: {
        flex: 1,
        alignItems: 'center',
        justifyContent: 'center',
        backgroundColor: 'transparent'
    },
    rectangle: {
        height: 200,
        width: 200,
        borderWidth: 1,
        borderColor: '#00FF00',
        backgroundColor: 'transparent'
    },
    rectangleText: {
        flex: 0,
        color: '#fff',
        marginTop: 10
    },
    border: {
        flex: 0,
        width: 200,
        height: 2,
        backgroundColor: '#00FF00',
    }
});