how to apply local notification in swift 3

LocalNotification.swift

// add the following code in app delegate
import UserNotifications
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        if #available(iOS 10.0, *) {
            let center = UNUserNotificationCenter.current()
            center.requestAuthorization(options: [.alert, .sound]) { (granted, error) in
                // Enable or disable features based on authorization.
            }
        } else {
            // Fallback on earlier versions
        }
         application.registerForRemoteNotifications()
        return true
        
    }
    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void){
    }
func application(_ application: UIApplication, didRegister notificationSettings: UIUserNotificationSettings) {
        
    }
    
    func application(_ application: UIApplication, didReceive notification: UILocalNotification) {
        
    }
    
    
    
    //apply the notification where you need
    
    func userNotification(notification_title:String,notification_body:String){
        
        print("userNotification working")
        
        if #available(iOS 10.0, *) {
            let content = UNMutableNotificationContent()
            content.title = notification_title
            content.sound  = UNNotificationSound.default()
            content.body = notification_body
            
            let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 2, repeats: false)
            let request = UNNotificationRequest(identifier: "FiveSecond", content: content, trigger: trigger)
            
            UNUserNotificationCenter.current().removeAllPendingNotificationRequests()
            
            let center = UNUserNotificationCenter.current()
            
            center.add(request) { (error) in
                print("error \(error)")
            }
            print("should have been added")
            
        } else {
            print("this device does not support notification ")
           
        }
 
    }