leandromperez / CalendarKit

πŸ“… Fully customizable calendar for iOS

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CalendarKit is a fully customizable calendar library written in Swift. It was designed to look similar to iOS Calendar app out-of-the-box, but allow complete customization when needed. To make modifications easy, CalendarKit is composed of multiple small modules. They can be used together, or on their own.


You can try CalendarKit with CocoaPods. Just enter in Terminal:

pod try CalendarKit

Watch demo video

Try it live in your browser


CalendarKit is available through CocoaPods. To install it, add the following line to your Podfile:

pod 'CalendarKit'


Subclass DayViewController and implement DayViewDataSource protocol to show events. CalendarKit requires DayViewDataSource to return an array of objects conforming to EventDescriptor protocol, specifying all the information needed to display a particular event:

// Return an array of EventDescriptors for particular date
override func eventsForDate(_ date: Date) -> [EventDescriptor] {
  var models = // Get events (models) from the storage / API

  var events = [Event]()

  for model in models {
      // Create new EventView
      let event = Event()
      // Specify StartDate and EndDate
      event.startDate = model.startDate
      event.endDate = model.endDate
      // Add info: event title, subtitle, location to the array of Strings
      var info = [model.title, model.location]
      info.append("\(datePeriod.beginning!.format(with: "HH:mm")) - \(datePeriod.end!.format(with: "HH:mm"))")
      // Set "text" value of event by formatting all the information needed for display
      event.text = info.reduce("", {$0 + $1 + "\n"})
  return events

There is no need to do layout, CalendarKit will take care of it. CalendarKit also creates EventViews for you and reuses them.

If needed, implement DayViewDelegate to handle user input

override func dayViewDidSelectEventView(_ eventview: EventView) {
  print("Event has been selected: \(eventview.data)")

override func dayViewDidLongPressEventView(_ eventView: EventView) {
  print("Event has been longPressed: \(eventView.data)")


If you have a specific programming question related to the library, please ask it on StackOverflow using the 'CalendarKit' tag. For bug reports and feature requests create a new GitHub Issue.


CalendarKit supports localization and uses iOS default locale to display month and day names. First day of the week is also selected according to iOS locale. Here are few examples:



CalendarKit's look can be easily customized. The steps needed for customizations are as follows:

  1. Create a new CalendarStyle object (or copy existing one)
  2. Change style by updating the properties.
  3. Invoke updateStyle method with the new CalendarStyle.
let style = CalendarStyle()
style.backgroundColor = UIColor.black

Light theme Dark theme


  • iOS 9.0+
  • Swift 5.1+


  • Neon is used for declarative layout
  • DateTools is used for date manipulation


The list of features currently in development can be viewed at issues page.

Before contributing, it is highly recommended to review guidelines and code style.


Richard Topchii


CalendarKit is available under the MIT license. See the LICENSE file for more info.


πŸ“… Fully customizable calendar for iOS



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