Firebase Cloud Messaging是否有回调指示收到消息? [英] is there a callback from Firebase Cloud Messaging to indicate that a message is received?

问题描述

在此处中的文档中，有两种方法可以收到推送通知.但正如评论所言，只有当用户在后台运行时点击通知时，它才会被触发.

from the documentation in here, there are two methods to receive a push notification. but as the comment say, it is only fired when the user tap the notification when app is in the background.

func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any]) {
  // If you are receiving a notification message while your app is in the background,
  // this callback will not be fired till the user taps on the notification launching the application.
  // TODO: Handle data of notification

  // With swizzling disabled you must let Messaging know about the message, for Analytics
  // Messaging.messaging().appDidReceiveMessage(userInfo)

  // Print message ID.
  if let messageID = userInfo[gcmMessageIDKey] {
    print("Message ID: \(messageID)")
  }

  // Print full message.
  print(userInfo)
}

func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any],
                 fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
  // If you are receiving a notification message while your app is in the background,
  // this callback will not be fired till the user taps on the notification launching the application.
  // TODO: Handle data of notification

  // With swizzling disabled you must let Messaging know about the message, for Analytics
  // Messaging.messaging().appDidReceiveMessage(userInfo)

  // Print message ID.
  if let messageID = userInfo[gcmMessageIDKey] {
    print("Message ID: \(messageID)")
  }

  // Print full message.
  print(userInfo)

  completionHandler(UIBackgroundFetchResult.newData)
}

我想要的是，每当有推送通知到来时，无论用户在后台还是在前台点击推送通知，我都想执行一些操作.所以每当收到消息时我都需要回调

what I want is, whenever a push notification comes, then I want to do some action no matter if the user tap the push notification or not, in the background or in the foreground. so I need a callback whenever a message is received

在Android中，我可以在 onMessageReceived 回调

in Android I can do it in onMessageReceived callback

    override fun onMessageReceived(remoteMessage: RemoteMessage) {
        super.onMessageReceived(remoteMessage)

        
    }

在iOS中是否有类似的回调?我找不到

is there any equivalent callback like that in iOS ? I can't find it

推荐答案

您可以通过在通知有效负载中指定 content_available 来向iOS应用发送静默通知.设置为true时，通知将在后台唤醒您的应用，您可以在 application(_:didReceiveRemoteNotification:fetchCompletionHandler:)委托方法中处理通知.

You can send a silent notification to iOS app by specifying content_available in the notification payload. When it is set to true, the notification will wake your app in the background and you can handle the notification in application(_:didReceiveRemoteNotification:fetchCompletionHandler:) delegate method.

您可以在此处中找到更多信息.

You can find more about here.

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

这篇关于Firebase Cloud Messaging是否有回调指示收到消息?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！