EKEvent event.eventIdentifier not removing - swift

Question

I am trying to remove an event I saved in the calendar with an event id but its removing a different event and sometimes it doesn't remove anything.
I am saving the eventId in a realm database when event is created and reading it back when I want to delete but its not working.
I have tried running it on an actual device, using an array instead of a dictionary, changing the span to .futureEvents but still doesn't work
my code for creating event and saving to realm database
/// function exits in another class
func addEventToCalendar(userName: String, userDate: Date) {
let userDefaults = UserDefaults.standard
let eventStore: EKEventStore = EKEventStore()
eventStore.requestAccess(to: .event) { (granted, error) in
if (granted) && (error == nil) {
print("granted \(granted)")
print("error \(String(describing: error))")
let event: EKEvent = EKEvent(eventStore: eventStore)
event.title = "\(userName) Birthday"
event.startDate = userDate
event.endDate = userDate
event.notes = "Happy Birthday!"
event.isAllDay = true
event.calendar = eventStore.defaultCalendarForNewEvents
let ekrules: EKRecurrenceRule = EKRecurrenceRule.init(recurrenceWith: .yearly, interval: 1, end: nil)
event.recurrenceRules = [ekrules]
//event.addAlarm(EKAlarm(absoluteDate: event.startDate))
//sets alert 00:00 on day of event
event.addAlarm(EKAlarm(relativeOffset: 0))
do {
try eventStore.save(event, span: .thisEvent, commit: true)
} catch let error as NSError {
print("error: \(error)")
}
let eventId = event.eventIdentifier ?? "nil-id"
userDefaults.setValue(eventId, forKey: "eventId")
print(eventId)
} else {
print("error not granted: \(String(describing: error))")
}
}
}
//saving it in a view controller class
#IBAction func okBtnPressed(_ sender: UIButton) {
let eventId = UserDefaults.standard.string(forKey: "eventId") ?? "no-id"
//// saving data to device
let newItem = Item()
newItem.userImageName = String(describing: userImageUrl)
newItem.userName = uName
newItem.isYearPresent = uYearPresent
newItem.userDOB = uDOB
newItem.color = UIColor.init(randomFlatColorOf: .dark).hexValue()
newItem.daysRemaining = daysRemain
newItem.eventId = eventId
self.save(item: newItem)
}
The event id saves succesfully in the realm database.
function for removing the event from calendar
func removeEvent(id: String) {
let store = EKEventStore()
store.requestAccess(to: .event) { (granted, error) in
if !granted { return }
// checking if event exists
if let eventToRemove = store.event(withIdentifier: id) {
do {
print("removing: \(id)")
try store.remove(eventToRemove, span: .thisEvent, commit: true)
print("event removed sucessfully")
} catch let error as NSError {
print("error: \(error)")
}
} else {
print("event doesnt exist.")
}
}
}
This is how I remove it
var eventIDS = [Int: String]()
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
// inserting evenIds to dictionary to access it in remove function
// I used an array but it gave me the same problem
if let item = itemsObject?[indexPath.row] {
eventIDS[indexPath.row] = item.eventId
}
}
// then I call remove function when swipe taps on cell
removeEvent(id: self.eventIDS[indexPath.row] ?? "")
Sometimes I get event removed successfully but it removes a different
event, sometimes I get the following errors
Error getting event with identifier 2BD633CA-BBEA-47CD-8410-40BCE6362A5C:98D9EAF2-D5EF-420F-B769-7F02B7795E54: Error Domain=EKCADErrorDomain Code=1010 "(null)"
event doesnt exist.

Answer 1

I figured it out. Because eventStore.requestAccess(to: .event) is asynchronous, I was saving the event id in the database before the id existed.
So I had to declare the function to accept a completion handler and return the value inside the completion handler.
//// adding events to calendar
func addEventToCalendar(userName: String, userDate: Date, completion: #escaping (String?)->()) {
let userDefaults = UserDefaults.standard
var eventId = ""
let eventStore: EKEventStore = EKEventStore()
eventStore.requestAccess(to: .event) { (granted, error) in
if (granted) && (error == nil) {
print("granted \(granted)")
print("error \(String(describing: error))")
let event: EKEvent = EKEvent(eventStore: eventStore)
event.title = "\(userName) \(NSLocalizedString("birthday", comment: "birthday"))"
event.startDate = userDate
event.endDate = userDate
event.notes = NSLocalizedString("happyBirthday", comment: "happyBirthday")
event.isAllDay = true
event.calendar = eventStore.defaultCalendarForNewEvents
let ekrules: EKRecurrenceRule = EKRecurrenceRule.init(recurrenceWith: .yearly, interval: 1, end: nil)
event.recurrenceRules = [ekrules]
//event.addAlarm(EKAlarm(absoluteDate: event.startDate))
//sets alert 00:00 on day of event
event.addAlarm(EKAlarm(relativeOffset: 0))
do {
try eventStore.save(event, span: .futureEvents, commit: true)
eventId = event.eventIdentifier ?? "no-Id"
print("Event has been saved with id \(String(describing: eventId))")
userDefaults.setValue(eventId, forKey: "eventId")
} catch let error as NSError {
print("error: \(error)")
}
completion(eventId)
} else {
print("error not granted: \(String(describing: error))")
completion(nil)
}
}
}
and then use it like so
addEventToCalendar(userName: uName, userDate: uDate) { (eventIdentifier) in
if let eventId = eventIdentifier {
print("Event add birthday id \(eventId)")
//// saving data to device
// run on main thread to avoid 'RLMException', reason: 'Realm accessed from incorrect thread.'
DispatchQueue.main.async {
let newItem = Item()
newItem.userImageName = String(describing: self.userImageUrl)
newItem.userName = uName
newItem.isYearPresent = uYearPresent
newItem.userDOB = uDOB
newItem.color = UIColor.init(randomFlatColorOf: .dark).hexValue()
newItem.daysRemaining = daysRemain
newItem.eventId = eventId
self.save(item: newItem)
// review app
self.review()
}