KVKCalendar is a most fully customization calendar library. Library consists of four modules for displaying various types of calendar (day, week, month, year). You can choose any module or use all. It is designed based on a standard iOS calendar, but with additional features. Timeline displays the schedule for the day and week.

Programming language: Swift
License: MIT License
Tags: Swift     iOS     UI     Calendar    
Latest version: v0.4.2

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CI Status Version Carthage SwiftPM compatible Platform License


KVKCalendar is a most fully customization calendar. Library consists of five modules for displaying various types of calendar (day, week, month, year, list of events). You can choose any module or use all. It is designed based on a standard iOS calendar, but with additional features. Timeline displays the schedule for the day and the week.

Additional features:

Need Help?

If you have a question about how to use KVKCalendar in your application, ask it on StackOverflow using the KVKCalendar tag.

Please, use Issues only for reporting bugs or requesting a new features in the library.


  • iOS 10.0+, iPadOS 10.0+, MacOS 11.0+ (supports Mac Catalyst)
  • Swift 5.0+


KVKCalendar is available through CocoaPods or Carthage or Swift Package Manager.


pod 'KVKCalendar'

Adding Pods to an Xcode project


github "kvyatkovskys/KVKCalendar"

Adding Frameworks to an Xcode project

Swift Package Manager (Xcode 12 or higher)

  1. In Xcode navigate to File β†’ Swift Packages β†’ Add Package Dependency...
  2. Select a project
  3. Paste the repository URL (https://github.com/kvyatkovskys/KVKCalendar.git) and click Next.
  4. For Rules, select Version (Up to Next Major) and click Next.
  5. Click Finish.

Adding Package Dependencies to Your App

Usage for UIKit

Import KVKCalendar. Create a subclass view CalendarView and implement CalendarDataSource protocol. Create an array of class [Event] and return the array.

import KVKCalendar

class ViewController: UIViewController {
    var events = [Event]()

    override func viewDidLoad() {

        let calendar = CalendarView(frame: frame)
        calendar.dataSource = self

        createEvents { (events) in
            self.events = events

    override func viewWillLayoutSubviews() {
        // to track changing frame when an user rotates device

extension ViewController {
    func createEvents(completion: ([Event]) -> Void) {
        let models = // Get events from storage / API

        let events = models.compactMap({ (item) in
            var event = Event(ID: item.id)
            event.start = item.startDate // start date event
            event.end = item.endDate // end date event
            event.color = item.color
            event.isAllDay = item.allDay
            event.isContainsFile = !item.files.isEmpty
            event.recurringType = // recurring event type - .everyDay, .everyWeek

            // Add text event (title, info, location, time)
            if item.allDay {
                event.text = "\(item.title)"
            } else {
                event.text = "\(startTime) - \(endTime)\n\(item.title)"
            return event

extension ViewController: CalendarDataSource {
    func eventsForCalendar(systemEvents: [EKEvent]) -> [Event] {
        // if you want to get events from iOS calendars
        // set calendar names to style.systemCalendars = ["Test"]
        let mappedEvents = systemEvents.compactMap { Event(event: $0) }
        return events + mappedEvents

Implement CalendarDelegate to handle user action and control calendar behaviour.

calendar.delegate = self

To use a custom view for specific event or date you need to create a new view of class EventViewGeneral and return the view in function.

class CustomViewEvent: EventViewGeneral {
    override init(style: Style, event: Event, frame: CGRect) {
        super.init(style: style, event: event, frame: frame)

// an optional function from CalendarDataSource
func willDisplayEventView(_ event: Event, frame: CGRect, date: Date?) -> EventViewGeneral? {
    guard event.ID == id else { return nil }

    return customEventView

To use a custom date cell, just subscribe on this optional method from CalendarDataSource (works for Day/Week/Month/Year views).

func dequeueCell<T>(parameter: CellParameter, type: CalendarType, view: T, indexPath: IndexPath) -> KVKCalendarCellProtocol? where T: UIScrollView { 
    switch type {
    case .year:
        let cell = (view as? UICollectionView)?.dequeueCell(indexPath: indexPath) { (cell: CustomYearCell) in
            // configure the cell
        return cell
    case .day, .week, .month:    
        let cell = (view as? UICollectionView)?.dequeueCell(indexPath: indexPath) { (cell: CustomDayCell) in
            // configure the cell
        return cell
    case .list:    
        let cell = (view as? UITableView)?.dequeueCell { (cell: CustomListCell) in
            // configure the cell
        return cell

Usage for SwiftUI

Add a new SwiftUI file and import KVKCalendar. Create a struct CalendarDisplayView and declare the protocol UIViewRepresentable for connection UIKit with SwiftUI.

import SwiftUI
import KVKCalendar

struct CalendarDisplayView: UIViewRepresentable {
    @Binding var events: [Event]

    private var calendar: CalendarView = {
        return CalendarView(frame: frame, style: style)

    func makeUIView(context: UIViewRepresentableContext<CalendarDisplayView>) -> CalendarView {
        calendar.dataSource = context.coordinator
        calendar.delegate = context.coordinator
        return calendar

    func updateUIView(_ uiView: CalendarView, context: UIViewRepresentableContext<CalendarDisplayView>) {
        context.coordinator.events = events

    func makeCoordinator() -> CalendarDisplayView.Coordinator {

    public init(events: Binding<[Event]>) {
        self._events = events

    // MARK: Calendar DataSource and Delegate
    class Coordinator: NSObject, CalendarDataSource, CalendarDelegate {
        private let view: CalendarDisplayView

        var events: [Event] = [] {
            didSet {

        init(_ view: CalendarDisplayView) {
            self.view = view

        func eventsForCalendar(systemEvents: [EKEvent]) -> [Event] {
            return events

Create a new SwiftUI file and add CalendarDisplayView to body.

import SwiftUI

struct CalendarContentView: View {
    @State var events: [Event] = []

    var body: some View {
        NavigationView {
            CalendarDisplayView(events: $events)


To customize calendar create an object Style and add to init class CalendarView.

public struct Style {
    public var event = EventStyle()
    public var timeline = TimelineStyle()
    public var week = WeekStyle()
    public var allDay = AllDayStyle()
    public var headerScroll = HeaderScrollStyle()
    public var month = MonthStyle()
    public var year = YearStyle()
    public var list = ListViewStyle()
    public var locale = Locale.current
    public var calendar = Calendar.current
    public var timezone = TimeZone.current
    public var defaultType: CalendarType?
    public var timeHourSystem: TimeHourSystem = .twentyFourHour
    public var startWeekDay: StartDayType = .monday
    public var followInSystemTheme: Bool = false 
    public var systemCalendars: Set<String> = []


Sergei Kviatkovskii


KVKCalendar is available under the MIT license

*Note that all licence references and agreements mentioned in the KVKCalendar README section above are relevant to that project's source code only.