Implementation method of UniApp to realize code scanning and QR code recognition

UniApp’s method of implementing code scanning and QR code recognition

With the popularity of smartphones, QR codes have become a very convenient way to interact with information. In mobile application development, implementing code scanning and QR code recognition functions can provide users with more convenience. This article will introduce how to implement this function in UniApp and provide corresponding code examples.

1. Introducing plug-ins

To implement code scanning and QR code recognition functions in UniApp, we need to introduce the corresponding plug-ins first. In the UniApp plug-in market, there are many code scanning and QR code recognition plug-ins to choose from, such as zxing, uniapp-qrcode, etc.

Taking the uniapp-qrcode plug-in as an example, we can add the corresponding plug-in reference in the pages.json file of the project:

"easycom": {
  "autoscan": [
    "uniapp-qrcode"
  ]
},

2. Use the API function

Introduction completed After adding the plug-in, we can use the API function provided by the plug-in to scan and identify the QR code. The following is a simple code example that demonstrates how to use the uniapp-qrcode plug-in to implement code scanning and QR code recognition functions:

<template>
  <view>
    <button @click="scanCode">扫描二维码</button>
    <image :src="imageUrl"></image>
    <text>{{ result }}</text>
  </view>
</template>

<script>
export default {
  data() {
    return {
      result: '',
      imageUrl: ''
    }
  },
  methods: {
    scanCode() {
      uni.scanCode({
        success: (res) => {
          this.result = res.result
          this.imageUrl = res.path
        },
        fail: (res) => {
          uni.showToast({
            title: '扫描失败',
            icon: 'none'
          })
        }
      })
    }
  }
}
</script>

In the above example, the code scanning function can be activated through the uni.scanCode method. After the QR code is scanned successfully, the res parameter in the success callback function will contain the QR code scan result. We can get the scan code result through res.result, and get the scanned QR code image address through res.path.

3. Processing the Scanning Results

After obtaining the scanning results, we can process them accordingly according to specific needs. For example, we can display the scanning results on the interface, or call the corresponding interface for background data interaction, etc.

In the above example, we display the code scanning results and QR code images on the interface by binding the result and imageUrl in the data attribute.

4. Permission application

When using the QR code scanning function, you need to pay attention to applying for the corresponding permissions. In UniApp, we can configure the corresponding permission application in the manifest.json file:

"permissions": {
  "scope.camera": {
    "desc": "用于扫码功能"
  }
},

In the above code snippet, we apply for camera permission by adding "scope.camera" to implement the QR code scanning function. At the same time, you also need to pay attention to determining whether the user has authorized camera permissions during use to provide a better user experience.

Summary

This article introduces the method of implementing code scanning and QR code recognition functions in UniApp, and provides corresponding code examples. By introducing corresponding plug-ins and calling corresponding APIs, we can easily implement code scanning and QR code recognition functions, providing users with more convenience.

Of course, in actual development, other factors need to be taken into consideration, such as permission application, interface interaction, etc. I hope this article can help you implement code scanning and QR code recognition functions in UniApp!

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