firestore 云消息 iOS Swift

Question

我无法在我的 firestore 文档数据库中获取新记录条目以向用户生成警报。

1. IOS 应用可以毫无问题地获取和更新 Firestore 数据
2. 如果我从 firebase 手动发送消息，我的应用会收到消息没有问题
3. 我可以毫无错误地将我的云功能部署到 Firebase

我做错了什么？谢谢你的帮助。

let functions = require('firebase-functions')
let admin = require('firebase-admin')
admin.initializeApp(functions.config().firebase)

let db = admin.firestore()

  exports.announceAlert = functions.database
    .ref('/alerts/{documentId}')
    .onCreate((snapshot, context) => {
        let alert = snapshot.val()
        sendNotification(alert)
    })

function sendNotification(alert) {

    let title = alert.Incident_Number
    let summary = alert.Flash_Summary
    let status = alert.Incident_Status  


    let payload = {
        notification: {
            title: 'Critical Incident: ' + title, 
            body: 'Summary: ' + summary,
            sound: 'default' 

        }
    }

    console.log(payload)

    let topic = "Alerts"
    admin.messaging().sendToTopic(topic, payload) 

}

Answer 1

这就是我所做的，并且奏效了。请记住，您的 iOS 应用程序的用户必须订阅该主题，而您可以通过该应用程序进行订阅。下面的代码只是一个函数，告诉 firebase 在某个存储库中创建新文档时向订阅用户发送通知。

let functions = require('firebase-functions')
let admin = require('firebase-admin')
admin.initializeApp(functions.config().firebase)

let db = admin.firestore()
  exports.announceMessage = functions.firestore
    .document('/myData/{documentId}')
    .onCreate((snapshot, context) => {
        let message = snapshot.data()
        sendNotification(message)
    })

function sendNotification(message) {

    let title = message.column1  
    let notification = message.column2

    let payload = {
        notification: {
            title: 'Some title: ' + title, 
            body: 'Some header: ' + notification

        },


    }

console.log(payload)
let topic = "yourTopic"
return admin.messaging().sendToTopic(topic, payload)

}