How to use NFC function in uniapp

How to use the NFC function in Uniapp

NFC (Near Field Communication) is a short-range wireless communication technology that allows simple and secure data transmission between devices. As one of the important functions of mobile devices, NFC is widely used in payment, access control, smart tags and other fields. In Uniapp, we can use plug-ins to realize the calling and operation of NFC functions.

1. Preparation

Before starting to use the NFC function of Uniapp, we need to ensure that the following conditions are met:

1. Need to be in the App Enable NFC support on the client, usually configured in manifest.json, as shown below:

   {
     "nfcPermission": {
    "support": true
     }
   }

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2. needs to be added in pages.json nfcThe reference of the plug-in is as follows:

   {
     "pages": [
    {
      "path": "pages/index/index",
      "nfc": {
        "powered": true,
        "drawStage": "front"
      }
    }
     ]
   }

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2. Using the plug-in

We can use uni-nfc# in Uniapp ##Plug-in to operate NFC function. First, we need to install the uni-nfc plug-in in the project. The installation command is as follows:

npm install uni-nfc

uni-nfc# into the pages that need to use NFC. ## Plug-in, and get the NFC instance, the code example is as follows:

// 引入uni-nfc插件
import uniNfc from 'uni-nfc';

export default {
  data() {
    return {
      nfcInstance: null,
    };
  },
  methods: {
    // 初始化NFC实例
    initNfcInstance() {
      this.nfcInstance = uniNfc.init();
    },
    // 监听NFC标签
    listenNfcTag() {
      this.nfcInstance.listenTag({
        success: (res) => {
          console.log('监听NFC标签成功', res);
          // 处理NFC标签数据
          this.handleTagData(res.data);
        },
        fail: (err) => {
          console.log('监听NFC标签失败', err);
        },
      });
    },
    // 处理NFC标签数据
    handleTagData(data) {
      // 处理NFC标签数据逻辑
    },
  },
  created() {
    // 初始化NFC实例
    this.initNfcInstance();
    // 监听NFC标签
    this.listenNfcTag();
  },
};

plug-in, and then define it in data A nfcInstance variable is created to store the NFC instance. In the initNfcInstance method, we initialize the NFC instance by calling uniNfc.init() and assign it to nfcInstance. Next, in the listenNfcTag method, we call this.nfcInstance.listenTag() to listen for the NFC tag. If the listening is successful, the success callback is executed and the tag is Data is processed through the this.handleTagData method. 3. NFC tag processing

After successfully monitoring the NFC tag, we can perform further operations through the tag data returned in the callback function. According to specific needs, we can read, write, parse and other operations on tag data. The following is a simple sample code:

// 处理NFC标签数据
handleTagData(data) {
  console.log('NFC标签数据', data);
  // 读取标签数据
  this.readTagData();
  // 写入标签数据
  const newData = 'New Data';
  this.writeTagData(newData);
},
// 读取标签数据
readTagData() {
  this.nfcInstance.read({
    success: (res) => {
      console.log('读取标签数据成功', res);
      // 处理读取的标签数据
      this.handleReadData(res.data);
    },
    fail: (err) => {
      console.log('读取标签数据失败', err);
    },
  });
},
// 写入标签数据
writeTagData(newData) {
  this.nfcInstance.write({
    data: newData,
    success: (res) => {
      console.log('写入标签数据成功', res);
    },
    fail: (err) => {
      console.log('写入标签数据失败', err);
    },
  });
},
// 处理读取的标签数据
handleReadData(data) {
  // 处理读取的标签数据逻辑
},

In the above code, we read the NFC tag data by calling the

method in the handleTagData method. In the readTagData method, we call this.nfcInstance.read() to read the tag data. After the reading is successful, the success callback is executed and the read The data is processed through the this.handleReadData method. Similarly, in the

method, we call the writeTagData method to write the NFC tag data. In the writeTagData method, we call this.nfcInstance.write() and pass in the data to be written. After the writing is successful, the success callback is executed. Through the above sample code, we can implement the operation of using the NFC function in Uniapp and process NFC tag data according to specific needs. Of course, in actual projects, we can also expand more NFC functions according to business needs, such as parsing tag data, verifying tag identity, etc. I hope this article will be helpful to learn and use the NFC function of Uniapp.

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