How to use the QR code login function in uniapp

Uniapp is a cross-platform development framework that can develop iOS and Android applications at the same time. It is a very common requirement to implement the QR code login function in Uniapp. This article will introduce how to use the QR code login function in Uniapp, and attach a code example.

1. Overview
The QR code login function means that users use their mobile phones to scan the QR code in the application to log in, avoiding the cumbersome account and password input operations. In Uniapp, we can use the third-party plug-in uni-qr-scanner to generate and scan QR codes.

2. Install the uni-qr-scanner plug-in
1. Open the HBuilderX development tool, search for the "uni-qr-scanner" plug-in in the plug-in market, and click Install;
2. After successful installation , add the plug-in configuration information in the manifest.json file.

"plugins": {
"uni-qr-scanner": {

"version": "1.0.0",
"provider": "hx2car"

}
}

3. Generate QR code
In the page where QR code needs to be generated, introduce the uni-qr-scanner plug-in and call the method of generating QR code.

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<view class="qrCode"></view>

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import uniQrScanner from 'uni-qr-scanner'
export default {

onReady() {
  this.createQrCode()
},
methods: {
  createQrCode() {
    uniQrScanner.createQRCode({
      content: 'your content',
      canvasId: 'qrCode',
      width: 200,
      height: 200
    })
  }
}

}
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In the above code, we first introduce uni-qr- scanner plug-in, and then call the createQRCode method to generate a QR code after the page is loaded.

4. Scan the QR code
In the page where the QR code needs to be scanned, the uni-qr-scanner plug-in is also introduced and the method of scanning the QR code is called.

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<view class="qrScanner">
  <view class="scanArea">
    <uni-qr-scanner id="scanner" @success="onScanSuccess" @fail="onScanFail"></uni-qr-scanner>
  </view>
</view>

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import uniQrScanner from 'uni-qr-scanner'
export default {

onReady() {
  this.startScan()
},
methods: {
  startScan() {
    uniQrScanner.startScan({
      element: 'scanner',
      callback: (result) => {
        // 处理扫描结果
      }
    })
  },
  onScanSuccess(result) {
    // 处理扫描结果
  },
  onScanFail(error) {
    // 处理扫描失败
  }
}

}
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In the above code, we first introduce uni-qr- scanner plug-in, and then call the startScan method to start scanning the QR code after the page is loaded. After the scan is successful, the onScanSuccess method will be triggered, and the scan results can be processed in this method; after the scan fails, the onScanFail method will be triggered, and the error information can be processed in this method.

5. Summary
This article introduces how to use the QR code login function in Uniapp and gives corresponding code examples. By using the uni-qr-scanner plug-in, we can easily generate and scan QR codes in Uniapp. I hope this article can help you use the QR code login function in Uniapp development.

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