ios - 本地化从 Firebase 发送的通知

Question

有没有办法翻译/本地化从 Firebase 发送的通知？

我已将我的应用设置为成功接收通知:

extension AppDelegate: UNUserNotificationCenterDelegate {

    func setupNotifications() {
        registerForRemoteNotifications()
        setupNotificationTokenRefresh()
    }

    func registerForRemoteNotifications() {
        let application = UIApplication.shared
        UNUserNotificationCenter.current().delegate = self

        application.registerForRemoteNotifications()
    }

    func setupNotificationTokenRefresh() {
        storeNotificationToken()
    
        _ = NotificationCenter.default.addObserver(
            forName: .MessagingRegistrationTokenRefreshed,
            object: nil,
            queue: .current
        ) { [weak self] _ in
            self?.storeNotificationToken()
        }
    }

    private func storeNotificationToken() {
        Messaging.messaging().token { [weak self] token, error in
            if let error = error {
                Log.error("Error fetching FCM registration token: \(error)")
            } else if let token = token {
                // save token
        }
    }
}

}

负载是从带有数据对象的 Firebase 云函数发送的，我想访问该数据对象并翻译/本地化发送的消息。

我查看了提供的几种方法，但它们似乎只在应用程序位于前台时才拦截通知，这不是我感兴趣的。

从服务器发送的负载:

const payload = {
    notification: {
        title: 'Friend request',
        body: senderName + ' wants to add you as a friend'
    },
    data: {
        senderUserId: friendRequestFrom,
        type: 'friendRequest'
    }
}

Answer 1

因为您已经在使用云功能，所以实现这一点的一种方法是使用 Google Cloud Translation API 在服务器端进行翻译。 .有一个good sample演示如何使用 Node.js 执行此操作。

例如，当新对象添加到实时数据库中的 /notifications 路径时，您将发送通知。你可以这样做:

const Translate = require('@google-cloud/translate')
const functions = require('firebase-functions')
const projectId = 'YOUR_PROJECT_ID'
const translate = new Translate({
  projectId: projectId,
});
const admin = require('firebase-admin')
admin.initializeApp(functions.config().firebase)

exports.sendNotification = functions.database.ref(`/notifications/{notif_id}`)
  .onWrite(event => {
    const notification = event.data.val()
    // Don't send when this isn't a new notification.
    if (event.data.previous.exists()) {
      return null
    }
    const user_id = notification.user_id
    getLocalLanguageOfUser(user_id).then(language => {
      if (language != 'en')
        translateTo(language, notification).then(localised => {
          return send(localised)
        }).catch(err => {
          return console.log(err)
        })
      } else { // it's English - no need to translate
        return send(notification)
      }
    })
})

function getLocalLanguageOfUser(user_id) {
  return new Promise((resolve, reject) => {
    // default will be 'en' for English
    firebase.database().ref(`users/${user_id}/language`)
      .once('value').then(snapshot => {
        resolve(snapshot.val() || 'en')
      })
      .catch(err => reject(err))
  })
}

function translateTo(language, notification) {
  return new Promise((resolve, reject) => {
    const text = notification.text;
    translate.translate(text, language).then(results => {
      const translation = results[0];
      resolve({
        ...notification,
        text: translation
      })
    }).catch(err => reject(err))
  })
}

function send(notification) {
  // use your current setup to send the notification.
  // 'text' key will already be localised.
}