Receiving Push Notifications while in background

by

application:didReceiveRemoteNotification: will call in the background only when you have added content-available key with value 1 into the notification payload.
In case of the Urban Airship, you can send Test Push under the Setting tab.
Sample Payload for Push Notifications:

{
  "aps": {
    "alert": "aaaa",
    "badge": "+1",
    "content-available": "1"
  },
  "device_tokens": [
    "86BA71E361B849E8312A7B943BA6B26A74AB436381CF3FEE3CD9EB436A12A292"
  ]
}

Apple has clearly mentioned in his documentation….

For a push notification to trigger a download operation, the
notification’s payload must include the content-available key with its
value set to 1. When that key is present, the system wakes the app in
the background (or launches it into the background) and calls the app
delegate’s
application:didReceiveRemoteNotification:fetchCompletionHandler:
method. Your implementation of that method should download the
relevant content and integrate it into your app.
https://developer.apple.com/library/content/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/BackgroundExecution/BackgroundExecution.html

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