let defaultCalendar: Calendar = {
    var calendar = Calendar.current
    calendar.firstWeekday = 1
    calendar.timeZone = TimeZone(secondsFromGMT: 0)!
    return calendar
}()

    @IBOutlet weak var monthHeaderView: VAMonthHeaderView! {
        didSet {
            let appereance = VAMonthHeaderViewAppearance(
                previousButtonImage: #imageLiteral(resourceName: "previous"),
                nextButtonImage: #imageLiteral(resourceName: "next"),
                dateFormat: "LLLL"
            )
            monthHeaderView.delegate = self
            monthHeaderView.appearance = appereance
        }
    }
    
    @IBOutlet weak var weekDaysView: VAWeekDaysView! {
        didSet {
            let appereance = VAWeekDaysViewAppearance(symbolsType: .veryShort, calendar: defaultCalendar)
            weekDaysView.appearance = appereance
        }
    }

    var calendarView: VACalendarView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let calendar = VACalendar(calendar: defaultCalendar)
        calendarView = VACalendarView(frame: .zero, calendar: calendar)
        calendarView.showDaysOut = true
        calendarView.selectionStyle = .multi
        calendarView.monthDelegate = monthHeaderView
        calendarView.dayViewAppearanceDelegate = self
        calendarView.monthViewAppearanceDelegate = self
        calendarView.calendarDelegate = self
        calendarView.scrollDirection = .horizontal
        view.addSubview(calendarView)
    }
    
    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        
        if calendarView.frame == .zero {
            calendarView.frame = CGRect(
                x: 0,
                y: weekDaysView.frame.maxY,
                width: view.frame.width,
                height: view.frame.height * 0.6
            )
            calendarView.setup()
        }
    }