Is it mandatory to use UNUserNotificationCenter to get push notification in iOS10

Question

Is it mandatory to use UNUserNotificationCenter implementation with the following code to get(make work) push notification in iOS10 ?

if #available(iOS 10.0, *){
    UNUserNotificationCenter.currentNotificationCenter().delegate = self
    UNUserNotificationCenter.currentNotificationCenter().requestAuthorizationWithOptions([.Badge, .Sound, .Alert], completionHandler: {(granted, error) in
        if (granted)
        {
            UIApplication.sharedApplication().registerForRemoteNotifications()
        }
        else{
            //Do stuff if unsuccessful...
        }
    })
}

Or is it just enough to just make the following to receive push notification to the existing app ?

• Import UserNotifications.framework
• Under "Capabilities"
  • Turn on "Push Notification"
  • Check "Remote Notification" checkbox under "Background Modes"

And please official documentation denoting this if any.