Firebase silent apns notification

问题:

Is there a way to send a silent APNS using google's firebase? It seems that if the app is in the background it will always show a notification to the user.

Thanks?

回答1:

You can send silent APNS messages using the FCM server API https://firebase.google.com/docs/cloud-messaging/http-server-ref

In particular you need to use:

• The data field:

This parameter specifies the custom key-value pairs of the message's payload.

For example, with data:{"score":"3x1"}:

On iOS, if the message is sent via APNS, it represents the custom data fields. If it is sent via FCM connection server, it would be represented as key value dictionary in AppDelegate application:didReceiveRemoteNotification:.

The key should not be a reserved word ("from" or any word starting with "google" or "gcm"). Do not use any of the words defined in this table (such as collapse_key).

Values in string types are recommended. You have to convert values in objects or other non-string data types (e.g., integers or booleans) to string

• The content-available field:

On iOS, use this field to represent content-available in the APNS payload. When a notification or message is sent and this is set to true, an inactive client app is awoken. On Android, data messages wake the app by default. On Chrome, currently not supported.

Full documentation: https://firebase.google.com/docs/cloud-messaging/http-server-ref#downstream-http-messages-json

回答2:

For a truly silent notification (both foreground and background) using FCM server use these fields:

"to" : "[token]",
"content_available": true,
"priority": "high",
"data" : {
  "key1" : "abc",
  "key2" : 123
}

NOTE: Make sure you are using "content_available" NOT "content-available" with FCM. It's converted for APNS and won't be received properly otherwise. The difference had tripped me up for some time.

回答3:

I explain this topic more detail on my blog. http://blog.boxstory.com/2017/01/how-to-send-silent-push-notification-in.html

** keypoint is : "content_available:true"

this is sample JSON

{
    "to" : "<device>",
    "priority": "normal",
    "content_available": true, <-- this key is converted to 'content-available:1'
    "notification" : {
      "body" : "noti body",
      "title" : "noti title",
      "link": "noti link "
    }
}

Note: If the above sample JSON is sent, then the notification will be visible to the user. Use below If you don't want the user to see the push notification.

{
  "to": "<device>",
  "priority": "normal",
  "content_available": true <-- this key is converted to 'content-
}