How to add an event to a Calendar using Swift/SwiftUI

SwiftCalendarView.swift

// You will need to add `Privacy - Calendars Usage Description` as a key in your plist file. 
// If you don't have a plist file, click on your project's name > Info and add the key there
// The value should be a brief description as to why you need access to the calendar

// This gist will create the event as soon as the view is loaded
// You'll want to attach it to a button or an action instead

// Place the following code in one of your SwiftUI View files

let store = EKEventStore()
let calendarName = "My Swift Calendar"

init() {
    switch EKEventStore.authorizationStatus(for: .event) {
    case .authorized:
        createEvent()
    case .denied:
        print("Access denied")
    case .notDetermined:
        // If the user hasn't granted access yet, ask
        store.requestAccess(to: .event, completion: {
            [self] (granted: Bool, error: Error?) -> Void in
            if granted {
                self.createEvent()
            } else {
                print("Access denied")
            }
        })
    default:
        print("Default")
    }
}

/**
 Inserts an event into the calendar
 */
func createEvent() {

    let myCal = getCalendar()
    let event = EKEvent(eventStore: store)

    event.calendar = myCal
    event.title = "New Apple Event"
    event.url = URL(string: "https://apple.com")
    event.startDate = Date()
    event.endDate = Date().addingTimeInterval(1 * 60 * 60) // An hour long event

    do {
        try store.save(event, span: .thisEvent)
    }
    catch {
        print("Error saving event in calendar")
    }
}

/**
 Returns or creates a calendar
 */
func getCalendar() -> EKCalendar
{
    var myCal : EKCalendar?

    let calendars = store.calendars(for: .event)

    // Find our calendar
    myCal = calendars.first(where: { $0.title == calendarName })

    // If no calendar was found, create one
    if myCal == nil {
        myCal = EKCalendar.init(for: .event, eventStore: store)
        myCal!.title = calendarName
        myCal!.source = store.defaultCalendarForNewEvents?.source
        do {
            try store.saveCalendar(myCal!, commit: true)
        } catch {
            print("Error saving event in calendar")
        }
    }
    return myCal!
}