UniApp implements real-time communication and message push techniques on the chat interface

UniApp is a cross-platform development framework that allows developers to use the same set of code to easily build applications suitable for multiple platforms. In UniApp, it is very important to implement real-time communication and message push in the chat interface. This article will introduce you to some techniques and sample codes.

1. The basic concept of real-time communication
Real-time communication means that after a user sends a message in the chat interface, the other party can receive it immediately and display it on his interface. Real-time communication usually requires the use of technologies such as WebSocket or long polling. In UniApp, we can use the uni-socket.io plug-in to implement real-time communication functions.

2. Introduce the uni-socket.io plug-in
First, introduce the uni-socket.io plug-in into the UniApp project. In HBuilderX, find the plug-in market, search and download the uni-socket.io plug-in. After the download is complete, add a reference to the uni-socket.io plug-in in the project's manifest.json file.

3. Establish a WebSocket connection with the server
In UniApp, we can establish a WebSocket connection in a Vuex state management and save the connection object in a global variable for convenience in the chat interface Send and receive messages.

The sample code is as follows:

// store.js
import io from '../static/socket.io.js'

const state = {
  socket: null
}

const mutations = {
  initSocket(state) {
    state.socket = io('ws://your-server-address:port')
    // 监听连接事件
    state.socket.on('connect', () => {
      console.log('Socket连接成功')
    })
  }
}

const actions = {
  initializeSocket({ commit }) {
    commit('initSocket')
  }
}

export default {
  state,
  mutations,
  actions
}

4. Sending and receiving messages
In the chat interface, we can send messages by calling the emit method of the global variable socket and listen for message events to receive information.

The sample code is as follows:

// chat.vue
export default {
  data() {
    return {
      message: '',
      messages: []
    }
  },
  mounted() {
    this.$store.dispatch('initializeSocket')
    // 监听消息事件
    this.$store.state.socket.on('message', (msg) => {
      this.messages.push(msg)
    })
  },
  methods: {
    sendMessage() {
      this.$store.state.socket.emit('message', this.message)
      this.messages.push(this.message)
      this.message = ''
    }
  }
}

5. Implementation of message push
In UniApp, we can use the uni-push plug-in to implement the message push function. First, search and download the uni-push plug-in in HBuilderX's plug-in market. Then, add a reference to the uni-push plugin in the project's manifest.json file.

6. Configure the parameters of message push
In the UniApp project, we need to configure the parameters of the push service in the manifest.json file. For specific configuration, please refer to the documentation of the uni-push plug-in. Common configuration parameters include appId, appKey, etc.

7. Receive push messages
In UniApp, we can receive the push message when it arrives by listening to the onShow event of the uni-app plug-in, and process it accordingly in the chat interface.

The sample code is as follows:

// App.vue
export default {
  onShow(options) {
    if (options.uniPush) {
      // 收到推送消息时，进行相应的处理
      console.log(options.uniPush)
    }
  }
}

8. Summary
By using the uni-socket.io plug-in and uni-push plug-in, we can easily realize real-time communication and chat interface in UniApp Message push function. By establishing a WebSocket connection, sending and receiving messages in the chat interface, and configuring the parameters of the push service and receiving push messages, we can build a fully functional chat application. I hope the introduction in this article will be helpful to everyone.

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