UniApp's design and development skills for implementing message push and push services

UniApp is a framework for developing cross-platform applications that can run on iOS, Android and Web platforms at the same time. When implementing the message push function, UniApp can cooperate with the back-end push service to realize the design and development of message push.

1. Overview of the design of message push
To implement the message push function in UniApp, you need to design a push service to send push messages to the App. The push service needs to implement the following functions:

1. Establish a connection with the App and send messages
2. Message transmission between the App
3. Receive messages sent by the App
4. Storage and management of push messages

2. Push service development skills

1. Use third-party push services
   UniApp can use third-party push services. Such as Aurora Push, Pigeon Push, etc. These services already provide complete push functions. UniApp only needs to implement interaction with the push service.
2. Self-built push service
   If you need a more customized push function, you can consider building a self-built push service. The following are the development tips for self-built push services:

(1) Connection establishment and message transmission
You can use a long connection to establish a connection between UniApp and the push service, and send messages through this connection transmission. In UniApp, WebSocket can be used for connection and message transmission processing. The following is a code example for WebSocket to establish a connection:

let socket = uni.connectSocket({
  url: 'ws://push.example.com',
  success() {
    // 连接成功
  },
  fail(err) {
    // 连接失败
  }
})
// 监听连接成功事件
socket.onOpen(function() {
  console.log('Websocket连接成功')
})

// 监听接收到消息事件
socket.onMessage(function(res) {
  console.log('收到消息', res.data)
})

// 监听连接关闭事件
socket.onClose(function(res) {
  console.log('连接关闭', res)
})

On the push server, it needs to process the message sent by the client and send the message to the client. The following is a code example for the push server to receive client messages and send messages:

// 监听客户端发送的消息
socket.on('message', function(message) {
  console.log('接收到客户端消息：', message)
  // 处理消息
  // ...
  // 发送消息给客户端
  socket.send('Hello Client')
})

(2) Storage and management of push messages
Push services need to store and manage user push messages. A database can be used to store users' push messages, and an interface is provided for UniApp to query and delete messages. The following is a code example for using a database to store push messages:

// 存储推送消息
function saveMessage(message) {
  // 将推送消息存入数据库
  db.collection('message').add({
    data: {
      message: message,
      time: new Date().getTime()
    },
    success(res) {
      console.log('推送消息存储成功')
    },
    fail(err) {
      console.error('推送消息存储失败', err)
    }
  })
}

// 查询推送消息
function queryMessage() {
  // 从数据库查询推送消息
  db.collection('message').orderBy('time', 'desc').get({
    success(res) {
      console.log('查询到推送消息', res.data)
    },
    fail(err) {
      console.error('查询推送消息失败', err)
    }
  })
}

// 删除推送消息
function deleteMessage(id) {
  // 从数据库删除推送消息
  db.collection('message').doc(id).remove({
    success(res) {
      console.log('删除推送消息成功')
    },
    fail(err) {
      console.error('删除推送消息失败', err)
    }
  })
}

3. Summary
UniApp can realize the message push function by cooperating with the push service. By using third-party push services or self-built push services, UniApp can interact with back-end push services. When building your own push service, use WebSocket to establish connections and message transmission, and use a database to store and manage push messages. The above are the design and development techniques for UniApp to implement message push and push services.

(The above article is for reference only, the specific implementation will be adjusted according to the actual situation)

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