calendarIdentifier The identifier for the recurrence rule’s calendar. Declarationvar calendarIdentifier: String { get } See AlsoAccessing Recurrence Rule PropertiesEKRecurrenceFrequencyrecurrenceEndfrequencyintervalfirstDayOfTheWeekdaysOfTheWeekdaysOfTheMonthdaysOfTheYearweeksOfTheYearmonthsOfTheYearsetPositionsEK_LOSE_FRACTIONAL_SECONDS_DO_NOT_USE()