react-native-qr-scanner
一个react-native的二维码扫描组件，支持扫描区域的限制以及扫描区域的偏移。
安装步骤：
安装依赖
yarn add react-native-camera react-native-qr-scannerlink依赖到native
react-native link react-native-camera && react-native-qr-scanner添加相机权限：
- ios在
ios/projectName/Info.plist:
<key>NSCameraUsageDescription</key>
<string/>
<key>NSPhotoLibraryUsageDescription</key>
<string/>
<key>NSMicrophoneUsageDescription</key>
<string/>
<key>NSPhotoLibraryAddUsageDescription</key>
<string/>- android在
android/app/src/main/AndroidManifest.xml:
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.RECORD_AUDIO"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.VIBRATE"/>修复相机组件找不到google()方法的错误
https://github.com/react-native-community/react-native-camera/blob/master/docs/GradleUpgradeGuide.md
使用组件
扫描
import React, {Component} from 'react';
import {Platform, StyleSheet, Text, View, TouchableOpacity} from 'react-native';
import {QRscanner} from 'react-native-qr-scanner';
export default class Scanner extends Component {
constructor(props) {
super(props);
this.state = {
flashMode: false,
zoom: 0.2
};
}
render() {
return (
<View style={styles.container}>
<QRscanner onRead={this.onRead} renderBottomView={this.bottomView} flashMode={this.state.flashMode} zoom={this.state.zoom} finderY={50}/>
</View>
);
}
bottomView = ()=>{
return(
<View style={{flex:1,flexDirection:'row',backgroundColor:'#0000004D'}}>
<TouchableOpacity style={{flex:1,alignItems:'center', justifyContent:'center'}} onPress={()=>this.setState({flashMode:!this.state.flashMode})}>
<Text style={{color:'#fff'}}>点我开启/关闭手电筒</Text>
</TouchableOpacity>
</View>
);
}
onRead = (res) => {
console.log(res);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: '#000'
}
});识别
import React, {Component} from 'react';
import {Platform, StyleSheet, Text, View, TouchableOpacity} from 'react-native';
import {QRreader} from 'react-native-qr-scanner';
import ImagePicker from 'react-native-image-picker';
export default class Scanner extends Component {
constructor(props) {
super(props);
this.state = {
reader: {
message: null,
data: null
}
};
}
render() {
return (
<View style={styles.container}>
<TouchableOpacity onPress={()=>{
this.openPhoto();
}}>
<Text style={{marginTop: 20}}>打开相册识别二维码</Text>
</TouchableOpacity>
<View>
{!this.state.reader? <Text>{!this.state.reader.message?'':`${this.state.reader.message}`}</Text>: <Text>{!this.state.reader.message?'':`${this.state.reader.message}:${this.state.reader.data}`}</Text>}
</View>
</View>
);
}
openPhoto(){
console.log('ImagePicker');
ImagePicker.launchImageLibrary({}, (response) => {
console.log('Response = ', response);
if (response.didCancel) {
console.log('User cancelled image picker');
}
else if (response.error) {
console.log('ImagePicker Error: ', response.error);
}
else if (response.customButton) {
console.log('User tapped custom button: ', response.customButton);
}
else {
if(response.uri){
var path = response.path;
if(!path){
path = response.uri;
}
QRreader(path).then((data)=>{
this.setState({reader: {
message: '识别成功',
data: data
}});
// 十秒后自动清空
setTimeout(() => {
this.setState({reader: {
message: null,
data: null
}})
}, 10000);
}).catch((err)=>{
this.setState({reader: {
message: '识别失败',
data: null
}});
});
}
}
});
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: '#fff'
}
});运行示例
$ cd example
$ yarn
$ react-native run-ios 或者 $ react-native run-android 示例中代码已link过，所以不用link
QRscanner
| 属性 | 类型 | 默认值 | 备注 |
|---|---|---|---|
| isRepeatScan | boolean | false | 是否允许重复扫描 |
| zoom | number | 0 | 相机焦距 范围0-1 |
| flashMode | bool | false | 开启手电筒 |
| onRead | func | (res)=>{} | 扫描回调 |
| maskColor | string | '#0000004D' | 遮罩层颜色 |
| borderColor | string | '#000000' | 边框颜色 |
| cornerColor | string | '#22ff00' | 扫描框转角的颜色 |
| borderWidth | number | 0 | 扫描框的边框宽度 |
| cornerBorderWidth | number | 4 | 扫描框转角的border宽度 |
| cornerBorderLength | number | 20 | 扫描框转角的宽度高度 |
| rectHeight | number | 200 | 扫描框高度 |
| rectWidth | number | 200 | 扫描框宽度 |
| finderX | number | 0 | 扫描框X轴偏移量 |
| finderY | number | 0 | 扫描框Y轴偏移量 |
| isCornerOffset | bool | true | 边角是否偏移 |
| cornerOffsetSize | number | 1 | 偏移量 |
| bottomHeight | number | 100 | 底部预留高度 |
| scanBarAnimateTime | number | 2500 | 扫描线时间 |
| scanBarColor | string | '#22ff00' | 扫描线颜色 |
| scanBarImage | any | null | 扫描线图片 |
| scanBarHeight | number | 1.5 | 扫描线高度 |
| scanBarMargin | number | 6 | 扫描线左右margin |
| hintText | string | '将二维码/条码放入框内，即可自动扫描' | 提示字符串 |
| hintTextStyle | object | {color: '#fff',fontSize: 14,backgroundColor: 'transparent'} | 提示字符串样式 |
| hintTextPosition | number | 130 | 提示字符串距离容器底部的值 |
| renderTopView | func | () =>{} | render顶部View |
| renderBottomView | func | ()=><View style={{flex:1,backgroundColor:'#0000004D'}}/> | render底部View |
| isShowScanBar | bool | true | 是否显示扫描线 |
| topViewStyle | object | null | render顶部容器样式 |
| bottomViewStyle | object | null | render底部容器样式 |
QRreader
QRreader(path:uri)是一个promise对象，接受一个uri图片路径参数， 返回成功识别的对象，失败则返回错误