最完善,快速的 react-native 二維碼掃描

wilsonYang發表於2017-12-12

react-native 二維碼掃描

先看效果

使用的開源庫

react-native-smart-barcode react-native-smart-timer-enhance

安裝

    npm install react-native-smart-barcode --save
    npm install react-native-smart-timer-enhance --save
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IOS配置

1.將\node_modules\react-native-smart-barcode\ios\RCTBarcode\RCTBarCode.xcodeproj 新增到Xcode專案中，如下圖：

2.新增依賴，Build Phases->Link Binary With Libraries 加入RCTBarCode.xcodeproj\Products\libRCTBarCode.a（直接拖）,如下圖：

3.確定一下Build Settings->Seach Paths->Header Search Paths是否有$(SRCROOT)/../../../react-native/React 若是沒有就新增並且設為recursive

4.將\node_modules\react-native-smart-barcode\ios\raw 資料夾拖到到Xcode專案中（確保資料夾是藍色的），如下圖：

5.在info.plist新增相機許可權 Privacy - Camera Usage Description：

react-native 程式碼

import React, {
    Component,
} from 'react'
import {
    View,
    StyleSheet,
    Alert,
} from 'react-native'

import Barcode from 'react-native-smart-barcode'
import TimerEnhance from 'react-native-smart-timer-enhance'

class BarcodeTest extends Component {

    // 構造
    constructor(props) {
        super(props);
        // 初始狀態
        this.state = {
            viewAppear: false,
        };
    }

    render() {

        return (
            <View style={{flex: 1, backgroundColor: 'black',}}>
                {this.state.viewAppear ? <Barcode style={{flex: 1,}}
                                                  ref={component => this._barCode = component}
                                                  onBarCodeRead={this._onBarCodeRead}/> : null}
            </View>
        )
    }

    componentDidMount() {

        this.setState({
            viewAppear: true,
        })
        // let viewAppearCallBack = (event) => {
        //     this.setTimeout(() => {
        //         this.setState({
        //             viewAppear: true,
        //         })
        //     }, 255)
        //
        // }
        // this._listeners = [
        //    // this.props.navigator.navigationContext.addListener('didfocus', viewAppearCallBack)
        // ]

    }

    componentWillUnmount() {
        this._listeners && this._listeners.forEach(listener => listener.remove());
    }

    _onBarCodeRead = (e) => {
        console.log(`e.nativeEvent.data.type = ${e.nativeEvent.data.type}, e.nativeEvent.data.code = ${e.nativeEvent.data.code}`)
        this._stopScan()
        Alert.alert(e.nativeEvent.data.type, e.nativeEvent.data.code, [
            {text: 'OK', onPress: () => this._startScan()},
        ])
    }

    _startScan = (e) => {
        this._barCode.startScan()
    }

    _stopScan = (e) => {
        this._barCode.stopScan()
    }

}

export default TimerEnhance(BarcodeTest)
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附原文

android 配置

1 在android/settings.gradle檔案中：

    include ':react-native-smart-barcode'
    project(':react-native-smart-barcode').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-smart-barcode/android')
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2 在android/app/build.gradle檔案中：

dependencies {
    ...
    // 在這裡新增
    compile project(':react-native-smart-barcode')
}
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3 在MainApplication.java檔案中（這裡官方上面有錯誤，在這裡修改一下）：

...
//將原來的程式碼註釋掉，換成這句
private ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {
    //  private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {
    @Override
    protected boolean getUseDeveloperSupport() {
      return BuildConfig.DEBUG;
    }

    @Override
    protected List<ReactPackage> getPackages() {
      return Arrays.<ReactPackage>asList(
              new MainReactPackage(),
              //直接在這裡新增
              new RCTCapturePackage()
      );
    }
  };
  //新增
  public void setReactNativeHost(ReactNativeHost reactNativeHost) {
    mReactNativeHost = reactNativeHost;
  }

  @Override
  public ReactNativeHost getReactNativeHost() {
    return mReactNativeHost;
  }
...
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4.在AndroidManifest.xml檔案中新增相機許可權:

<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.VIBRATE"/>
<uses-feature android:name="android.hardware.camera"/>
<uses-feature android:name="android.hardware.camera.autofocus"/>
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