class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

       func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject : AnyObject]?) -> Bool {

            let notificationType = UIUserNotificationType.Alert | UIUserNotificationType.Badge | UIUserNotificationType.Sound
            let settings = UIUserNotificationSettings(forTypes: notificationType, categories: nil)
            application.registerUserNotificationSettings(settings)

            application.applicationIconBadgeNumber = 0  // resetting the badge number to again 0

            return true
        }

        func application(application: UIApplication, didReceiveLocalNotification notification: UILocalNotification) {

            application.applicationIconBadgeNumber = 0  //resetting the badge number to again 0

        }

class ViewController: UIViewController {


    @IBAction func startNotification(sender: UIButton) {

        var localNotification = UILocalNotification()
        localNotification.fireDate = NSDate(timeIntervalSinceNow: 5)  // notification will be sent after 5 seconds from clicking
        localNotification.alertBody = "Notification came"
        localNotification.timeZone = NSTimeZone.defaultTimeZone() // Time zone of the notfication's fire date
        localNotification.applicationIconBadgeNumber = UIApplication.sharedApplication().applicationIconBadgeNumber + 1 //The number to diplay on the icon badge. We will increment this number by one.

        UIApplication.sharedApplication().scheduleLocalNotification(localNotification) // scheduling the notification

    }