更新Firebase实时数据库节点时发送推送通知

I have created an app which uses firebase real-time database and storage. My app allows users to message each other, but I am not sure how to notify the user when they have received a new message. I store all of the messages in one node called messages. I then store the message relationships in a different node called "user-messages". How do I monitor the "user-messages" node to alert the user with a notification that they have a new message? I am familiar with observing event types and such, i.e.: .Value and .ChildAdded, but I am not sure how to trigger an event to send the user a notification.

我创建了一个使用firebase实时数据库和存储的应用程序。我的应用程序允许用户互相发送消息，但我不确定如何在收到新消息时通知用户。我将所有消息存储在一个名为messages的节点中。然后，我将消息关系存储在名为“user-messages”的不同节点中。如何监控“用户消息”节点以通知用户有新消息的通知？我熟悉观察事件类型等，即：.Value和.ChildAdded，但我不知道如何触发事件来向用户发送通知。

edit: gave a little more clairity.

编辑：给了更多的肯定。

3 个解决方案

#1

So I accidently did not see that Firebase can use Google Cloud Messaging which seems to be able to do what I want. For future reference firebase has put the IOS setup here :Firebase Cloud Messaging SetUp

所以我意外地没有看到Firebase可以使用Google Cloud Messaging，它似乎可以做我想要的。为了将来参考，firebase已将IOS设置放在此处：Firebase Cloud Messaging SetUp

#2

Like you mentioned, you can use child_added event to monitor whenever a new message is added to user-messages and firebase will call your event handler whenever a new child is added.

就像你提到的那样，你可以使用child_added事件监视每当新消息被添加到用户消息时，firebase会在添加新子节点时调用你的事件处理程序。

ref.child('user-messages').on('child_added', (snapshot) => {
  // Read the message and send notification here
})

You may want to update the user-message as well after it has been handled so that you don't end up sending duplicate notifications when your app restarts.

您可能还希望在处理完用户消息后更新用户消息，以便在应用重新启动时不会发送重复的通知。

#3

What I did was set up an XMPP server with Ejabbered in order to conduct notifications. Hope the following helps.

我所做的是设置一个带有Ejabbered的XMPP服务器以进行通知。希望以下有所帮助。

https://firebase.google.com/docs/cloud-messaging/xmpp-server-ref

https://firebase.google.com/docs/cloud-messaging/server#implementing-the-xmpp-connection-server-protocol

#1