Retrieving iOS calendar event with EventKit

To retrieve iOS calendar event, we need to work with EventKit. First we will create a EKEventStore, then we need to request permission to use EventKit.

import Foundation
import EventKit

class EventKitDataModel {
    private let eventStore = EKEventStore()
   
    func authorizeEventKit(completion: @escaping EKEventStoreRequestAccessCompletionHandler) {
        eventStore.requestAccess(to: EKEntityType.event) { (accessGranted, error) in
            completion(accessGranted, error)
        }
    }
}

Once we have the permission, getting calendar events from the event score is quite straightforward. In this example we are going to query the event store to get a list of calendar events happening during a set of Date. Adding the two functions below to the class:

func collectData(since: Date, until: Date) {  
        let timefilter = self.makeTimePredicate(since: since, until: until)
        
        //Load events
        var events: [EKEvent]? = nil
        events = eventStore.events(matching: timefilter)
        if let allevents = events {
            for event in allevents {
                //Do something to the event
                //e.g. Get the title of the event
                let eventtitle = event.title!
            }
        }
    }

func makeTimePredicate (since startDate: Date, until endDate: Date) -> NSPredicate {
        return eventStore.predicateForEvents(withStart: startDate, end: endDate, calendars: nil)
    }

Here we create a function, which takes a “since date” and an “until date”. We create a time predicate using the two dates, and then query the event store using eventStore.events(matching: <predicate>) to get an array of all events within the two dates. The predicate is created by predicateForEvents(). The events are represented as EKEvent. Please consult the Swift manual for more information.