How to fetch Reminder with CalendarIdentifier in EventKit?

Question

in Apple Documentation Search with Unique Identifiers

If you know the event’s unique identifier because you fetched it previously with a predicate, you can use the EKEventStore method event(withIdentifier:) to fetch the event. If it is a recurring event, this method will return the first occurrence of the event. You can get an event’s unique identifier with the eventIdentifier property.

Similarly, if you know a specific reminder’s unique identifier from previously fetching it with a predicate, you can call the calendarItem(withIdentifier:) instance method. calendarItem(withIdentifier:) can fetch any calendar item (reminders and events), whereas event(withIdentifier:) fetches only events.

My problem is I want fetch A EKReminder to use isCompleted property.

 // Mark reminder as completed
 // Use the completed property to mark a reminder as completed
 func complete(_ reminder: EKReminder) {
    reminder.isCompleted = true
    
    /* Some my customize code */
    
    // Update the reminder
    self.save(reminder)
}

but
method func calendarItem(withIdentifier identifier: String) -> EKCalendarItem? return an EKCalendarItem.

I dont want use for loop to search exactly Reminder I wanted. Is there any way?

Answer 1

EKCalendarItem is the base class of EKReminder and EKEvent. If you know that the calendar item is a reminder cast it to EKReminder

let reminder = store.calendarItem(withIdentifier: identifier) as! EKReminder