第一次读取代码后，react-native-barcodescanner停止读取代码

Question

默认情况下，react-native-barcodescanner会不断读取条形码。我希望它读取一个条形码，然后停下来。我怎么做？

ZXing可以选择这样做，How to stop continuous scanning by zxing-android-embedded in Android，但react-native-barcodescanner似乎不公开此功能。

Answer 1

使用某种标志。

constructor(props) { 
    super(props); 
    this.scanSuccess = false; 
    .... 
    } 

    barcodeReceived(e) { 
    if (this.scanSuccess) return; 
    console.log("bar code detected", JSON.stringify(e)); 
    this.scanSuccess = true; 
    ..... 
    } 

还要检查这个例子https://github.com/ideacreation/react-native-barcodescanner/blob/master/Examples/BarcodeScanner/index.android.js

Answer 2

你可以停止这样的。此代码从here。转到链接查看完整示例。

onBarCodeRead: function(e) { 
    this.setState({showCamera: false}); 
    AlertIOS.alert(
     "Barcode Found!", 
     "Type: " + e.type + "\nData: " + e.data 
    ); 
    }