CalendarKit
A Swift calendar UI library for iOS and Mac Catalyst that mimics the Apple Calendar app with full customization.
What is CalendarKit?
CalendarKit is a Swift calendar UI library for iOS and Mac Catalyst that provides a ready-to-use calendar interface resembling the Apple Calendar app. It solves the problem of building a native-feeling calendar component from scratch by offering an out-of-the-box solution with extensive customization options.
iOS and Mac Catalyst developers who need to integrate a calendar view into their apps, particularly those seeking a native Apple-like appearance without building a custom calendar UI from the ground up.
Developers choose CalendarKit because it delivers a high-quality, native-looking calendar component that works immediately while allowing deep customization of styles, themes, and event displays through a modular architecture.
Overview
📅 Calendar for Apple platforms in Swift
Use Cases
Best For
- Building iOS apps that require a calendar interface with a native Apple Calendar look and feel.
- Developing event scheduling or booking applications where displaying events with customizable descriptors is essential.
- Creating localized calendar views that automatically adapt to the user's iOS locale for month/day names and first day of the week.
- Implementing calendar features in Swift projects that support both light and dark modes with easy style updates.
- Integrating modular calendar components independently rather than using a monolithic library.
- Rapid prototyping of calendar-based interfaces for iOS or Mac Catalyst without designing a custom UI from scratch.
Not Ideal For
- Apps targeting multiple platforms beyond iOS and Mac Catalyst, such as Android or web, since CalendarKit is Swift-only and UIKit-based.
- Designs requiring a calendar that diverges significantly from the Apple Calendar aesthetic, as the library is optimized for that native look and feel.
- Projects needing out-of-the-box support for advanced calendar features like recurring events, drag-and-drop rescheduling, or conflict resolution, which are not highlighted in the core functionality.
Pros & Cons
Pros
Mimics the design and feel of the default Apple Calendar app out-of-the-box, providing a familiar user experience without custom design work, as shown in the screenshot examples.
Allows full style and theme customization, including Dark Mode support, by creating or modifying CalendarStyle objects and calling updateStyle, detailed in the Styles section.
Automatically adapts to the iOS locale for month/day names and first day of the week, reducing manual translation effort, with examples provided for German and Norwegian.
Composed of multiple independent modules that can be used separately, enabling developers to import only needed components without bloating the app, as stated in the philosophy.
Cons
Built on UIKit, which doesn't integrate natively with SwiftUI, forcing developers to use UIViewRepresentable bridges and adding complexity for modern SwiftUI-based projects.
Focuses on basic event display via EventDataSource but lacks built-in handling for common needs like recurring events or drag-and-drop editing, requiring custom implementation.
Requires developers to implement the EventDataSource protocol and manually format event data into strings, which can be verbose and error-prone for complex event models, as seen in the usage example.
Frequently Asked Questions
Related Projects
FSCalendarA fully customizable iOS calendar library, compatible with Objective-C and Swift
JTAppleCalendarThe Unofficial Apple iOS Swift Calendar View. Swift calendar Library. iOS calendar Control. 100% Customizable
CVCalendarA custom visual calendar for iOS 8+ written in Swift (>= 4.0).
HorizonCalendarA declarative, performant, iOS calendar UI component that supports use cases ranging from simple date pickers all the way up to fully-featured calendar apps.
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