Notifications3.swift

//Notification Content
let content = UNMutableNotificationContent()
content.title = "Invitation"
content.subtitle = "This is a Local Notification."
content.body = "You are invited."
content.categoryIdentifier = "INVITATION"
content.sound = UNNotificationSound.default()

//Notification Trigger - when the notification should be fired
let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 5, repeats: false)

//Notification Request
let request = UNNotificationRequest(identifier: "Anniversary", content: content, trigger: trigger)

//Scheduling the Notification
let center = UNUserNotificationCenter.current()
center.add(request) { (error) in
    if let error = error
    {
        print(error.localizedDescription)
    }
}