react-native 通过react-native-camera实现二维码的扫描功能。
进入扫描界面，扫到结果后取到结果并返回上一级界面。
工具类ShowScanScreen.js
'use strict';
import React, { Component } from 'react';
import { StyleSheet, View, StatusBar, TouchableOpacity, Image, Text, Vibration } from 'react-native';
import Camera from 'react-native-camera';
import { Actions } from 'react-native-router-flux';
const IconLeft = (
<TouchableOpacity
activeOpacity={0.8}
style={{width: '50',height: '50', backgroundColor: '#ff0000'}}
onPress={() => {
Actions.pop();
}}>
<View >
</View>
</TouchableOpacity>
);
let isFirstIn = true;
export default class ShowScanScreen extends Component {
initData() {
isFirstIn = true;
}
constructor(props) {
super(props);
this.initData();
this.camera = null;
this.state = {
camera: {
aspect: Camera.constants.Aspect.sretch,
captureTarget: Camera.constants.CaptureTarget.cameraRoll,
type: Camera.constants.Type.back,
orientation: Camera.constants.Orientation.auto,
flashMode: Camera.constants.FlashMode.auto,
},
isRecording: false,
};
this.takePicture = this.takePicture.bind(this);
this.startRecording = this.startRecording.bind(this);
this.stopRecording = this.stopRecording.bind(this);
this.switchType = this.switchType.bind(this);
this.switchFlash = this.switchFlash.bind(this);
}
takePicture() {
if (this.camera) {
this.camera.capture()
.then((data) => console.log(data))
.catch(err => console.error(err));
}
}
startRecording() {
if (this.camera) {
this.camera.capture({ mode: Camera.constants.CaptureMode.video })
.then((data) => console.log(data))
.catch(err => console.error(err));
this.setState({
isRecording: true
});
}
}
stopRecording() {
if (this.camera) {
this.camera.stopCapture();
this.setState({
isRecording: false
});
}
}
switchType() {
let newType;
const { back, front } = Camera.constants.Type;
if (this.state.camera.type === back) {
newType = front;
} else if (this.state.camera.type === front) {
newType = back;
}
this.setState({
camera: {
...this.state.camera,
type: newType,
},
});
}
get typeIcon() {
let icon;
const { back, front } = Camera.constants.Type;
if (this.state.camera.type === back) {
icon = require('../assets/ic_camera_rear_white.png');
} else if (this.state.camera.type === front) {
icon = require('../assets/ic_camera_front_white.png');
}
return icon;
}
switchFlash() {
let newFlashMode;
const { auto, on, off } = Camera.constants.FlashMode;
if (this.state.camera.flashMode === auto) {
newFlashMode = on;
} else if (this.state.camera.flashMode === on) {
newFlashMode = off;
} else if (this.state.camera.flashMode === off) {
newFlashMode = auto;
}
this.setState({
camera: {
...this.state.camera,
flashMode: newFlashMode,
},
});
}
get flashIcon() {
let icon;
const { auto, on, off } = Camera.constants.FlashMode;
if (this.state.camera.flashMode === auto) {
icon = require('../assets/ic_flash_auto_white.png');
} else if (this.state.camera.flashMode === on) {
icon = require('../assets/ic_flash_on_white.png');
} else if (this.state.camera.flashMode === off) {
icon = require('../assets/ic_flash_off_white.png');
}
return icon;
}
onBarCodeRead(e) {
console.log(e.data);
if (isFirstIn) {
// alert(e.data);
Vibration.vibrate();
isFirstIn = false;
// console.log(StringUtil.object2Json(this.props));
Actions.pop({ refresh: ({ 'mScanedQRCode': e.data }) });
} else {
}
}
render() {
return (
<View style={styles.container}>
<StatusBar
animated
hidden
/>
<Camera
ref={(cam) => {
this.camera = cam;
}}
style={styles.preview}
aspect={this.state.camera.aspect}
captureTarget={this.state.camera.captureTarget}
type={this.state.camera.type}
flashMode={this.state.camera.flashMode}
defaultTouchToFocus
mirrorImage={false}
// onBarCodeRead={(data) => {
// console.log(data);
// alert(data);
// }}
onBarCodeRead={this.onBarCodeRead}
>
<Text style={styles.centerBox}/>
{/*<Text style={styles.capture} onPress={this.takePicture.bind(this)}>[CAPTURE]</Text>*/}
</Camera>
<View style={[styles.overlay, styles.topOverlay]}>
{IconLeft}
{/*<TouchableOpacity*/}
{/*style={styles.typeButton}*/}
{/*onPress={() => {*/}
{/*}}*/}
{/*// onPress={this.switchType}*/}
{/*>*/}
{/*<Image*/}
{/*source={this.typeIcon}*/}
{/*/>*/}
{/*</TouchableOpacity>*/}
<TouchableOpacity
style={styles.flashButton}
onPress={
() => {
this.switchFlash();
}
}
>
<Image
source={this.flashIcon}
/>
</TouchableOpacity>
</View>
{/*<View style={[styles.overlay, styles.bottomOverlay]}>*/}
{/*{*/}
{/*!this.state.isRecording*/}
{/*&&*/}
{/*<TouchableOpacity*/}
{/*style={styles.captureButton}*/}
{/*onPress={this.takePicture}*/}
{/*>*/}
{/*<Image*/}
{/*source={require('../assets/ic_photo_camera_36pt.png')}*/}
{/*/>*/}
{/*</TouchableOpacity>*/}
{/*||*/}
{/*null*/}
{/*}*/}
{/*<View style={styles.buttonsSpace}/>*/}
{/*{*/}
{/*!this.state.isRecording*/}
{/*&&*/}
{/*<TouchableOpacity*/}
{/*style={styles.captureButton}*/}
{/*onPress={this.startRecording}*/}
{/*>*/}
{/*<Image*/}
{/*source={require('../assets/ic_videocam_36pt.png')}*/}
{/*/>*/}
{/*</TouchableOpacity>*/}
{/*||*/}
{/*<TouchableOpacity*/}
{/*style={styles.captureButton}*/}
{/*onPress={this.stopRecording}*/}
{/*>*/}
{/*<Image*/}
{/*source={require('../assets/ic_stop_36pt.png')}*/}
{/*/>*/}
{/*</TouchableOpacity>*/}
{/*}*/}
{/*</View>*/}
</View>
);
}
//ios:{ path: 'assets-library://asset/asset.JPG?id=C7A7D82A-C0F9-4011-B920-3C5433189CBD&ext=JPG' }
// takePicture() {
// const options = {};
// //options.location = ...
// this.camera.capture({
// metadata: options,
// jpegQuality:50,
//
// })
// .then((data) => console.log(data))
// .catch(err => console.error(err));
// }
}
const styles = StyleSheet.create({
container: {
flex: 1,
flexDirection: 'row',
backgroundColor: 'transparent',
},
preview: {
flex: 1,
justifyContent: 'flex-end',
alignItems: 'center'
},
capture: {
flex: 0,
backgroundColor: '#fff',
borderRadius: 5,
color: '#000',
padding: 10,
margin: 40
},
centerBox: {
position: 'absolute',
top: 200,
width: 200,
height: 200,
alignItems: 'center',
justifyContent: 'center',
borderWidth: 2,
borderColor: '#29B6F6',
backgroundColor: 'rgba(0,0,0,0.0)',
},
overlay: {
position: 'absolute',
padding: 16,
right: 0,
left: 0,
alignItems: 'center',
},
topOverlay: {
top: 0,
flex: 1,
flexDirection: 'row',
justifyContent: 'space-between',
alignItems: 'center',
},
bottomOverlay: {
bottom: 0,
backgroundColor: 'rgba(0,0,0,0.4)',
flexDirection: 'row',
justifyContent: 'center',
alignItems: 'center',
},
captureButton: {
padding: 15,
backgroundColor: 'white',
borderRadius: 40,
},
typeButton: {
padding: 5,
},
flashButton: {
padding: 5,
},
buttonsSpace: {
width: 10,
},
});
