第一次讀取代碼後，react-native-barcodescanner停止讀取代碼

Question

默認情況下，react-native-barcodescanner會不斷讀取條形碼。我希望它讀取一個條形碼，然後停下來。我怎麼做？

ZXing可以選擇這樣做，How to stop continuous scanning by zxing-android-embedded in Android，但react-native-barcodescanner似乎不公開此功能。

Answer 1

使用某種標誌。

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

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

還要檢查這個例子https://github.com/ideacreation/react-native-barcodescanner/blob/master/Examples/BarcodeScanner/index.android.js

Answer 2

你可以停止這樣的。此代碼從here。轉到鏈接查看完整示例。

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