EKCalendar Not Persisting

I can create a new calendar and save it with the following function:

func createCalendarForUser() { let sourcesInEventStore = self.eventStore.sources / let subscribedSourceIndex = sourcesInEventStore.index {$0.title == "Subscribed Calendars"} if let subscribedSourceIndex = subscribedSourceIndex { let userCalendar = EKCalendar(for: .event, eventStore: self.eventStore) userCalendar.title = "newCalendar" userCalendar.source = sourcesInEventStore[subscribedSourceIndex] do { try self.eventStore.saveCalendar(userCalendar, commit: true) print("calendar creation successful") } catch { print("cal \(userCalendar.source.title) failed : \(error)") } } }

This functions great while the app is open and running. I can save events to them, i can see them in my local calendar, and life is good. However, once the app is terminated and goes into the background the calendars disappear, along with any events created in them. I've tried saving the calendar to different sources other then the

Subscribed Calendars

func createCalendarForUser() { let sourcesInEventStore = self.eventStore.sources / let localSourceIndex = sourcesInEventStore.index {$0.sourceType == .local} if let localSourceIndex = localSourceIndex { let userCalendar = EKCalendar(for: .event, eventStore: self.eventStore) userCalendar.title = "newCalendar" userCalendar.source = sourcesInEventStore[localSourceIndex] do { try self.eventStore.saveCalendar(userCalendar, commit: true) print("creating new calendar successful") } catch { print("creating new calendar failed : \(error)") } } }

I also tried this method :

func createCalendarForUser() { let sourcesInEventStore = self.eventStore.sources / let userCalendar = EKCalendar(for: .event, eventStore: self.eventStore) userCalendar.title = "newCalendar" userCalendar.source = sourcesInEventStore.filter{ (source: EKSource) -> Bool in source.sourceType.rawValue == EKSourceType.local.rawValue }.first! do { try self.eventStore.saveCalendar(userCalendar, commit: true) print("creating new calendar succesful") } catch { print("creating new calendar failed : \(error)") } }

As metioned here as mentioned here https://www.andrewcbancroft.com/2015/06/17/creating-calendars-with-event-kit-and-swift/

Has anyone else come across this problem?