ios – Adding a Calendar Event in Swift

I’m not a very experienced Swift programmer, and I’m trying to work this out from pieces I’ve picked up on SO and other places.

I’m trying to add a simple calendar event on iOS. I’ve got a button in SwiftUI, which looks like this:

Button(action: {
    let eventStore : EKEventStore = EKEventStore()
    var ok = false
    let authorizationStatus = EKEventStore.authorizationStatus(for: .event)

    if authorizationStatus == .fullAccess {
        print("Already Authorised")
        ok = true
    }
    else {
        eventStore.requestFullAccessToEvents { granted, error in
            print("granted: \(Date())")
            ok = granted && error==nil
        }
    }
    if(ok) {
        let event:EKEvent = EKEvent(eventStore: eventStore)
        event.timeZone = nil
        event.title = "Testing"
        event.startDate = Date()
        event.endDate = Date()
        event.notes = "This is a test"
        event.calendar = eventStore.defaultCalendarForNewEvents

        do {
            try eventStore.save(event, span: .thisEvent)
            print("Saved")
        } catch let error as NSError {
            print("oops: \(error)")
        }
    
    }
    else {
        print("no good")
    }
}) {
    Text("Test")
}

The code runs and prints the right messages, but it doesn’t actually save the event in the calendar.

In the console, I get the message:

XPC connection was invalidated

and I don’t know what that means or whether it’s related.

Whats needed to get the calendar event to save?