Appropriate situations to create new EKCalendar iOS

Question

I am working on an iOS app which creates, updates, and deletes EKEvents. This can easily be accomplish by saving the events to EKEventStore.defaultCalendarForNewEvents. Under what circumstance would I want create a new EKCalendar for my own app and what functionality does that entail?

I am asking because I am currently trying to create a calendar in Swift 3.0 and it keeps failing, which leaves me wandering what the purpose of the new calendar is in the first place.

fileprivate var eventStore = EKEventStore()
fileprivate var newCalendar : EKCalendar?

func createNewCalendar() {
    self.newCalendar = EKCalendar(for: .event, eventStore: self.eventStore)
    self.newCalendar!.title = "newCal"
    let sourcesInEventStore = self.eventStore.sources
    self.newCalendar!.source = eventStore.defaultCalendarForNewEvents.source

    let newCalIndex = sourcesInEventStore.index {$0.title == "newCal"}
    if newCalIndex == nil {
        do {
            try self.eventStore.saveCalendar(self.newCalendar!, commit: true)
            print("cal succesful")
        } catch {
            print("cal failed")
        }
    }
}

I know i have access to the eventStore because I can pull in events as well as save them to the EKEventStore.defaultCalendarForNewEvents and update them using their existing calendar.

Answer 1

There might be many reasons why you want to create a new calendar. Personally, I choose to create a new calendar when I want to separate a group of events from the ones that were created and tied to the default one. By this way, you also take advantage of bulk deleting of those newly created events when you think you don't need them. Just delete the calendar and all of its events will be purged as well.

By the way, if you are not sure what should be the source (iCloud, local, maybe tied to some mail account etc.) of the calendar you want to create, just use the source of default one:

let newCalendar = EKCalendar(forEntityType: .Event, eventStore: eventStore)
newCalendar.source = eventStore.defaultCalendarForNewEvents.source

Also make sure that the default calendar's allowsContentModifications property returns true if you want to use its source otherwise it is very likely that you won't be able to create an event within the new calendar.