TypeError.undefined 不是对象（正在计算 _reactNativeCamera.RNCamera.constants.also

Question

TypeError.undefined 不是对象（计算 _reactNativeCamera.RNCamera.constants.also

Answer 1

//import RNCamera  from 'react-native-camera';   // instead of 

import { RNCamera } from 'react-native-camera';   //Use this 


 <View style={styles.container}>

            <RNCamera
                style={styles.preview}
                onBarCodeRead={this.onBarCodeRead}
                ref={cam => this.RNCamera = cam}
            >
                <Text style={{backgroundColor: 'white'}}>BARCODE SCANNER</Text>
            </RNCamera>

        <View style={styles.bottomOverlay}>