Eventkit Calendar

Handles all the EventKit boilerplate for working with iOS calendars and reminders. Covers the iOS 17+ granular authorization model (full access, write-only, reminders), event and reminder CRUD, recurrence rules with complex patterns like specific weekdays, alarms, and the EventKitUI presentation controllers. Includes practical guidance on the write-only access trap: you can create events but can't read them back, so if your app needs to verify or edit what it saved, request full access instead. The docs walk through structured locations, fetching with date predicates (capped at four years), and the reminder completion handler pattern. Targets Swift 6.3 and iOS 26+ but notes the Info.plist keys needed for backward compatibility with iOS 10-16.