AppDelegate.swift

 func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    
    // Register for push notifications
    let notificationTypes: UIUserNotificationType = .Badge | .Sound | .Alert
    let notificationSettings = UIUserNotificationSettings(forTypes: notificationTypes, categories: nil)
    UIApplication.sharedApplication().registerUserNotificationSettings(notificationSettings)
    // Ask user permission
    UIApplication.sharedApplication().registerForRemoteNotifications()
    
    return true
  }