Как внедрить Evenkit, чтобы запросить разрешение

Например, вы должны вызвать requestAccess(to:completion: в хранилище событий.

let eventStore = EKEventStore()
eventStore.requestAccess(to: .reminder) { (granted, error) in
    if let error = error {
       print(error)
       return
    }
    if granted {
       // go on managing reminders
    }
}

import Cocoa
import EventKit

@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate, NSTableViewDataSource, NSTableViewDelegate {

    @IBOutlet weak var window: NSWindow!

    var eventStore = EKEventStore()

    func applicationDidFinishLaunching(_ aNotification: Notification)
    {
        eventStore.requestAccess(to: .reminder)
        { (granted, error) in

            if let error = error
            {
                print(error)
                return
            }

            if granted
            {
                let reminder = EKReminder(eventStore: self.eventStore)
                reminder.title = "Go to the store and buy milk"
                reminder.calendar = self.eventStore.defaultCalendarForNewReminders()
                let date : NSDate = NSDate()
                let alarm : EKAlarm = EKAlarm (absoluteDate: date.addingTimeInterval(10) as Date)
                reminder.addAlarm(alarm)
                do
                {
                    try self.eventStore.save(reminder,commit: true)
                }
                catch let error {print("Reminder failed with error \(error.localizedDescription)")}
            }
        }
    }

    func applicationWillTerminate(_ aNotification: Notification)
    {
        // Insert code here to tear down your application
    }
}