Push notification not receiving in background iOS

Question

I am doing push notification in my project through GCM. My Application is able to receive notification in foreground but not in background.

I receive a message insi

Answer 1

use this payload

{
    "aps": {
        "alert": "Hello World",
        "sound": "default"
        "content-available" :1
    }
}

With content-available enabled:

1 App is in Foreground

No system alert shown

application:didReceiveRemoteNotification:fetchCompletionHandler: is called

2 App is in Background

System alert is shown

application:didReceiveRemoteNotification:fetchCompletionHandler: is called

3App is in Suspended

App state changes to Background

System alert is shown

application:didReceiveRemoteNotification:fetchCompletionHandler: is called

4 App is Not Running because killed by user

System alert is shown

No callback is called