reactNative之react-native-smart-barcode

在rn中想要調起二維碼掃碼功能，需要用到 react-native-smart-barcode 控件，總結如下

一、安裝

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

二、安卓端集成

1.在android/settings.gradle文件中新增以下代碼：

include ':react-native-smart-barcode'
project(':react-native-smart-barcode').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-smart-barcode/android')

2.在android/app/build.gradle文件中：

dependencies {
    ...
    // 在這里添加
    compile project(':react-native-smart-barcode')
}

3.在MainApplication.java文件中（這里官方上面有錯誤，在這里修改一下）：

...
//將原來的代碼注釋掉，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(),
              //直接在這里添加
              new RCTCapturePackage()
      );
    }
  };
  //添加,好像也可以不添加
  public void setReactNativeHost(ReactNativeHost reactNativeHost) {
    mReactNativeHost = reactNativeHost;
  }
 
  @Override
  public ReactNativeHost getReactNativeHost() {
    return mReactNativeHost;
  }
...

4.在AndroidManifest.xml文件中添加相機權限:

...
<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"/>
...

IOS端集成：

1.將\node_modules\react-native-smart-barcode\ios\RCTBarcode\RCTBarCode.xcodeproj 添加到Xcode項目中，如下圖：

 

 

2.添加依賴，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並設為recursive

 

 

4.將\node_modules\react-native-smart-barcode\ios\raw 文件夾拖到到Xcode項目中（確保文件夾是藍色的），如下圖：

 

 

5.在info.plist添加相機權限 Privacy - Camera Usage Description：

如何使用（這里貼一下作者的代碼）:

 

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() {
        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)

原文地址：https://www.jianshu.com/p/8bef243bc35d