EKRecurrenceRuleStringExtension
Usage
recurrenceRuleFromString
You can create EKRecurrenceRule object from iCalendar fromat.
let recurrenceRule = EKRecurrenceRule.recurrenceRuleFromString("RRULE FREQ=MONTHLY;INTERVAL=1;BYMONTHDAY=13;BYDAY=FR")
stringForICalendar
let recurrenceRule = EKRecurrenceRule.recurrenceRuleFromString("RRULE FREQ=MONTHLY;INTERVAL=1;BYMONTHDAY=13;BYDAY=FR") print(recurrenceRule?.stringForICalendar()) // => RRULE FREQ=MONTHLY;INTERVAL=1;BYMONTHDAY=13;BYDAY=FR