Event Kit - edit repeating event - swift

Question

func editFutureEventToCalendar(id:String,title: String, description: String?,alarams :[EKAlarm],location:String,contacts:[GenParticipants],repeatString :String,timeZone:NSTimeZone, startDate: NSDate, endDate: NSDate , isAllDay :Bool,calendar:EKCalendar,StruLocation:EKStructuredLocation?)->Bool {
let eventStore = EventsManager.getEventStore()
let event = EventsManager.geteventID(id: id)
let ocdate = event.occurrenceDate
event.title = title
event.startDate = startDate as Date
event.endDate = endDate as Date
event.notes = description
event.calendar = calendar
// event.occurrenceDate = ocdate
event.timeZone = timeZone as TimeZone //timezoneNSTimeZone() as TimeZone //timeZone as TimeZone
event.isAllDay = isAllDay
if StruLocation != nil {
event.structuredLocation = StruLocation
}else {
event.structuredLocation = StruLocation
}
if repeatString != "None" {
if event.hasRecurrenceRules {
let rrrl = event.recurrenceRules
for i in rrrl! {
event.removeRecurrenceRule(i)
}
}
let rule = EventsManager.getRepeatValue(repeatString)//self.getRepeatValue(option: repeat)
event.addRecurrenceRule(rule!)
}else if repeatString == "None"{
if event.hasRecurrenceRules {
let rrrl = event.recurrenceRules
for i in rrrl! {
event.removeRecurrenceRule(i)
}
}
}
for item in alarams {
event.addAlarm(item)
}
// event.location = location
// let formatter = CNContactFormatter()
// formatter.style =
var attendees = [EKParticipant]()
// for item in contacts {
//
// let con = event.(contact: item)
// attendees.append(con!)
//
// }
do {
try eventStore.save(event, span: .futureEvents, commit: true)
//try eventStore.save(event, span: .thisEvent)
return true
} catch let e as NSError {
EZAlertController.alert(e.debugDescription)
}
return false
}
I have this function for editing all the future events in repeat series - if i edit the event in between the series of events its deleting all the previous events and editing future events .
i want it to edit all the events in series .
I am using eventKit not eventKitUI . i dont want eventkitUI.
How to edit this function to do the same or do i have to fetch the event differently as the identifier are same for all the events in repeating series?