Lazy Loading Event Store!

Clocker/Events and Reminders/CalendarHandler.swift

@@ -20,7 +20,7 @@ extension EventCenter {
         var sourcesAndCalendars: [Any] = []
 
         // Fetch array of user's calendars sorted first by source title and then by calendar title
-        let calendars = store.calendars(for: .event).sorted { (cal1, cal2) -> Bool in
+        let calendars = eventStore.calendars(for: .event).sorted { (cal1, cal2) -> Bool in
 
             if cal1.source.sourceIdentifier == cal2.source.sourceIdentifier {
                 return cal1.title < cal2.title
@@ -109,8 +109,16 @@ extension EventCenter {
         return filteredAllDayEvent?.event
     }
 
+    private func initializeStoreIfNeccesary() {
+        if eventStore == nil {
+            eventStore = EKEventStore()
+        }
+    }
+
     func requestAccess(to entity: EKEntityType, completionHandler: @escaping (_ granted: Bool) -> Void) {
-        store.requestAccess(to: entity) { [weak self] granted, _ in
+        initializeStoreIfNeccesary()
+
+        eventStore.requestAccess(to: entity) { [weak self] granted, _ in
 
             // On successful granting of calendar permission, we default to showing events from all calendars
             if let self = self, entity == .event, granted {
@@ -161,7 +169,7 @@ extension EventCenter {
     }
 
     func retrieveAllCalendarIdentifiers() -> [String] {
-        return store.calendars(for: .event).map { (calendar) -> String in
+        return eventStore.calendars(for: .event).map { (calendar) -> String in
             calendar.calendarIdentifier
         }
     }
@@ -193,19 +201,21 @@ extension EventCenter {
             return
         }
 
+        initializeStoreIfNeccesary()
+
         let calendar = NSCalendar(calendarIdentifier: NSCalendar.Identifier.gregorian)
 
         let startDate = createDateComponents(with: calendar, start)
         let endDate = createDateComponents(with: calendar, end)
 
         // Passing in nil for calendars to search all calendars
-        let predicate = store.predicateForEvents(withStart: startDate,
-                                                 end: endDate,
-                                                 calendars: nil)
+        let predicate = eventStore.predicateForEvents(withStart: startDate,
+                                                      end: endDate,
+                                                      calendars: nil)
 
         var eventsForDateMapper: [Date: [EventInfo]] = [:]
 
-        let events = store.events(matching: predicate)
+        let events = eventStore.events(matching: predicate)
 
         // Populate our cache with events that match our startDate and endDate.
         // We map eachDate to array of events happening on that day

Clocker/Events and Reminders/EventCenter.swift

@@ -6,7 +6,7 @@ import EventKit
 class EventCenter: NSObject {
     private static var shared = EventCenter()
 
-    let store = EKEventStore()
+    var eventStore: EKEventStore!
 
     var calendar: EKCalendar?
 

Clocker/Events and Reminders/RemindersHandler.swift

@@ -7,7 +7,7 @@ extension EventCenter {
 
     private func retrieveCalendar() -> EKCalendar? {
         if calendar == nil {
-            let calendars = store.calendars(for: .reminder)
+            let calendars = eventStore.calendars(for: .reminder)
             let calendarTitle = "Clocker Reminders"
             let predicate = NSPredicate(format: "title matches %@", calendarTitle)
             let filtered = calendars.filter { predicate.evaluate(with: $0) }
@@ -15,14 +15,14 @@ extension EventCenter {
             if !filtered.isEmpty {
                 calendar = filtered.first
             } else {
-                calendar = EKCalendar(for: .reminder, eventStore: store)
+                calendar = EKCalendar(for: .reminder, eventStore: eventStore)
                 calendar?.title = "Clocker Reminders"
-                calendar?.source = store.defaultCalendarForNewReminders()?.source
+                calendar?.source = eventStore.defaultCalendarForNewReminders()?.source
 
                 guard let calendar = calendar else { return nil }
 
                 do {
-                    try store.saveCalendar(calendar, commit: true)
+                    try eventStore.saveCalendar(calendar, commit: true)
                 } catch {
                     assertionFailure("Unable to store calendar")
                 }
@@ -60,7 +60,7 @@ extension EventCenter {
                                                                               from: reminderDate)) else { return false }
         reminderComponents.timeZone = TimeZone(identifier: timezone)
 
-        let reminderEvent = EKReminder(eventStore: store)
+        let reminderEvent = EKReminder(eventStore: eventStore)
         reminderEvent.calendar = retrieveCalendar()
         reminderEvent.title = "\(title) - Clocker"
         reminderEvent.startDateComponents = reminderComponents
@@ -70,7 +70,7 @@ extension EventCenter {
 
         // Commit the event
         do {
-            try store.save(reminderEvent, commit: true)
+            try eventStore.save(reminderEvent, commit: true)
         } catch {
             Logger.log(object: ["Error": error.localizedDescription],
                        for: "Error saving reminder")