Push notification is most important part of the app so while we are adding push notification in our iOS app we need to complete following setup.

First Register Application for APNS, (Include the following code in didFinishLaunchingWithOptions method inside AppDelegate.swift)

IOS 9

var settings : UIUserNotificationSettings = UIUserNotificationSettings(forTypes:UIUserNotificationType.Alert|UIUserNotificationType.Sound, categories: nil)
UIApplication.sharedApplication().registerUserNotificationSettings(settings)…