我在使用 react-native 时遇到 onBarCodeRead 问题。
预期行为:应用程序控制台记录条形码类型和数据。
实际行为:应用程序只是打开相机,_onBarCodeRead 永远不会被调用。
任何解释都会令人满意。
这是代码:
'use strict';
import React, { Component } from 'react';
import {
AppRegistry,
Dimensions,
StyleSheet,
Text,
TouchableHighlight,
View
} from 'react-native';
import Camera from 'react-native-camera';
class camera_app extends Component {
constructor(props) {
super(props);
this.state = {
showCamera: true,
};
}
renderCamera = () => {
if(this.state.showCamera) {
return (
<Camera
ref={(cam) => {
this.camera = cam;
}}
style={styles.container}
aspect={Camera.constants.Aspect.fill}
onBarCodeRead={this._onBarCodeRead}>
</Camera>
);
} else {
return (
<View></View>
);
}
}
render() {
return (
this.renderCamera()
);
}
_onBarCodeRead = (e) => {
this.setState({showCamera: false});
alert("Barcode Found!",
"Type: " + e.type + "\nData: " + e.data);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: "center",
alignItems: "center",
backgroundColor: "transparent",
},
});
AppRegistry.registerComponent('rn_camera', () => camera_app);