Alarm example in calender

Solution:

In default Calender you can schedule the events by EKEvent and EKAlarm.The below is an example for which you can set an alarm from today to next three days at your current time.I added 30 seconds buffer time for that you can test it easily.

Example:

import UIKit

import EventKit

class ViewController: UIViewController {

    var yourReminderCalendar: EKCalendar?

    override func viewDidLoad() {

        super.viewDidLoad()

         var eventDB = EKEventStore.init()

        // Request access to calendar first

        eventDB.requestAccess(to: .event, completion: { (granted, error) in

            if granted {

                var event = EKEvent.init(eventStore: eventDB)

        event.title = "New Event"

        event.startDate = Date()

                let end = NSCalendar.current.date(byAdding: .day, value: 3, to: Date());              event.endDate = end

        event.isAllDay = true

        event.calendar = eventDB.defaultCalendarForNewEvents

                let alarm = EKAlarm(absoluteDate:Date().addingTimeInterval(30))

                event.addAlarm(alarm)

                do {

                    try eventDB.save(event, span: .thisEvent)

                } catch let error as NSError {

                    print("failed to save event with error : \(error)")

                }

            }

            else

            {

                print("calendar not allowed")

            }}

            )

        // Do any additional setup after loading the view, typically from a nib.

    }

    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

        // Dispose of any resources that can be recreated.

    }

}