Push notification in swift (iOS)

Push.swift

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    // Override point for customization after application launch.
        
    // notification
    if let options = launchOptions {
        let notificationPayload: NSDictionary = options[UIApplicationLaunchOptionsRemoteNotificationKey] as NSDictionary
        // do somehting with the notifications
    }
    
    // Register for Push Notitications, if running iOS 8
    if application.respondsToSelector("registerUserNotificationSettings:") {
        
        let types:UIUserNotificationType = (.Alert | .Badge | .Sound)
        let settings:UIUserNotificationSettings = UIUserNotificationSettings(forTypes: types, categories: nil)
        
        application.registerUserNotificationSettings(settings)
        application.registerForRemoteNotifications()
        
    } else {
        // Register for Push Notifications before iOS 8
        application.registerForRemoteNotificationTypes(.Alert | .Badge | .Sound)
    }
    
    return true
}

func application(application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: NSData) {
    println("didRegisterForRemoteNotificationsWithDeviceToken")
}
  
func application(application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: NSError) {
    println("failed to register for remote notifications:  (error)")
}
  
func application(application: UIApplication, didReceiveRemoteNotification userInfo: [NSObject : AnyObject]) {
    println("didReceiveRemoteNotification")
    if application.applicationState == .Active {
        
    } else {
        
    }
}