KVKCalendar

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.

Requirements

iOS 13.0+, iPadOS 13.0+, MacOS 11.0+ (supports Mac Catalyst)
Swift 5.0+

Installation

KVKCalendar is available through CocoaPods or Swift Package Manager.

CocoaPods

pod 'KVKCalendar'

Adding Pods to an Xcode project

Swift Package Manager (Xcode 12 or higher)

In Xcode navigate to File → Swift Packages → Add Package Dependency…
Select a project
Paste the repository URL (https://github.com/kvyatkovskys/KVKCalendar) and click Next.
For Rules, select Version (Up to Next Major) and click Next.
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() {
        super.viewDidLoad()
        
        let calendar = CalendarView(frame: frame)
        calendar.dataSource = self
        view.addSubview(calendar)
        
        createEvents { (events) in
            self.events = events
            self.calendarView.reloadData()
        }
    }
    
    override func viewWillLayoutSubviews() {
        super.viewWillLayoutSubviews()
        // to track changing frame when an user rotates device
        calendarView.reloadFrame(view.frame)
    }
}

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
        })
        completion(events)
    }
}

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 CalendarViewDisplayable and declare the protocol UIViewRepresentable for connection UIKit with SwiftUI.

import SwiftUI
import KVKCalendar

struct CalendarViewDisplayable: UIViewRepresentable {

    @Binding var events: [Event]
    var selectDate = Date()
    var style = Style()
    
    private var calendar = KVKalendarView(frame: .zero)
        
    func makeUIView(context: UIViewRepresentableContext<CalendarViewDisplayable>) -> KVKCalendarView {
        calendar.dataSource = context.coordinator
        calendar.delegate = context.coordinator
        return calendar
    }
    
    func updateUIView(_ uiView: KVKCalendarView, context: UIViewRepresentableContext<CalendarViewDisplayable>) {
        context.coordinator.events = events
    }
    
    func makeCoordinator() -> CalendarDisplayView.Coordinator {
        Coordinator(self)
    }
    
    public init(events: Binding<[Event]>) {
        _events = events
        calendar = KVKCalendarView(frame: frame, date: selectDate, style: style)
    }
    
    // MARK: Calendar DataSource and Delegate
    class Coordinator: NSObject, CalendarDataSource, CalendarDelegate {
        private let view: CalendarViewDisplayable
        
        var events: [Event] = [] {
            didSet {
                view.events = events
                view.calendar.reloadData()
            }
        }
        
        init(_ view: CalendarViewDisplayable) {
            self.view = view
            super.init()
        }
        
        func eventsForCalendar(systemEvents: [EKEvent]) -> [Event] {
            events
        }
    }
}

Create a new SwiftUI file and add CalendarViewDisplayable to body.

import SwiftUI

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

    var body: some View {
        NavigationStack {
            CalendarViewDisplayable(events: $events)
        }
    }
}

Styles

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> = []
}

Author

Sergei Kviatkovskii

License

KVKCalendar is available under the MIT license