public void UpdateDayView(CalendarDayView dayView)
 {
     dayView.Marked = _calendarMonthView.IsDayMarkedDelegate == null ?
                      false : _calendarMonthView.IsDayMarkedDelegate(dayView.Date);
     dayView.Available = _calendarMonthView.IsDateAvailable == null ?
                         true : _calendarMonthView.IsDateAvailable(dayView.Date);
 }
        public void BuildGrid()
        {
            DateTime previousMonth       = _currentMonth.AddMonths(-1);
            DateTime nextMonth           = _currentMonth.AddMonths(1);
            var      daysInPreviousMonth = DateTime.DaysInMonth(previousMonth.Year, previousMonth.Month);
            var      daysInMonth         = DateTime.DaysInMonth(_currentMonth.Year, _currentMonth.Month);

            weekdayOfFirst = WeekDayIndex(_currentMonth.DayOfWeek);
            var lead = daysInPreviousMonth - (weekdayOfFirst - 1);

            // build last month's days
            for (int i = 1; i <= weekdayOfFirst; i++)
            {
                var viewDay = new DateTime(previousMonth.Year, previousMonth.Month, i);
                var dayView = new CalendarDayView {
                    SelectionColor = _calendarMonthView.SelectionColor, TodayCircleColor = _calendarMonthView.TodayCircleColor, BackgroundColor = _calendarMonthView.MonthBackgroundColor
                };

                                #if __UNIFIED__
                dayView.Frame = new CoreGraphics.CGRect((i - 1) * WeekDayWidth, 0, WeekDayWidth, WeekDayHeigth);
                                #else
                dayView.Frame = new RectangleF((i - 1) * WeekDayWidth, 0, WeekDayWidth, WeekDayHeigth);
                                #endif

                dayView.Date = viewDay;
                dayView.Text = lead.ToString();

                AddSubview(dayView);
                _dayTiles.Add(dayView);
                lead++;
            }

            var position = weekdayOfFirst + 1;
            var line     = 0;

            // current month
            for (int i = 1; i <= daysInMonth; i++)
            {
                var viewDay = new DateTime(_currentMonth.Year, _currentMonth.Month, i);
                var dayView = new CalendarDayView
                {
                                        #if __UNIFIED__
                    Frame = new CoreGraphics.CGRect((position - 1) * WeekDayWidth, line * WeekDayHeigth, WeekDayWidth, WeekDayHeigth),
                                        #else
                    Frame = new RectangleF((position - 1) * WeekDayWidth, line * WeekDayHeigth, WeekDayWidth, WeekDayHeigth),
                                        #endif

                    Today = (CurrentDate.Date == viewDay.Date),
                    Text  = i.ToString(),

                    Active           = true,
                    Tag              = i,
                    Selected         = viewDay.Date == SelectedDate.Date,
                    SelectionColor   = _calendarMonthView.SelectionColor,
                    TodayCircleColor = _calendarMonthView.TodayCircleColor,
                    BackgroundColor  = _calendarMonthView.MonthBackgroundColor,
                };
                dayView.Date = viewDay;
                UpdateDayView(dayView);

                if (dayView.Selected)
                {
                    SelectedDayView = dayView;
                }

                AddSubview(dayView);
                _dayTiles.Add(dayView);

                position++;
                if (position > 7)
                {
                    position = 1;
                    line++;
                }
            }

            //next month
            if (position != 1)
            {
                int dayCounter = 1;
                for (int i = position; i < 8; i++)
                {
                    var viewDay = new DateTime(nextMonth.Year, nextMonth.Month, i);
                    var dayView = new CalendarDayView
                    {
                                                #if __UNIFIED__
                        Frame = new CoreGraphics.CGRect((i - 1) * WeekDayWidth, line * WeekDayHeigth, WeekDayWidth, WeekDayHeigth),
                                                #else
                        Frame = new RectangleF((i - 1) * WeekDayWidth, line * WeekDayHeigth, WeekDayWidth, WeekDayHeigth),
                                                #endif

                        Text             = dayCounter.ToString(),
                        SelectionColor   = _calendarMonthView.SelectionColor,
                        TodayCircleColor = _calendarMonthView.TodayCircleColor,
                        BackgroundColor  = _calendarMonthView.MonthBackgroundColor,
                    };
                    dayView.Date = viewDay;
                    UpdateDayView(dayView);

                    AddSubview(dayView);
                    _dayTiles.Add(dayView);
                    dayCounter++;
                }
            }

                        #if __UNIFIED__
            Frame = new CoreGraphics.CGRect(Frame.Location, new CoreGraphics.CGSize(Frame.Width, (line + 1) * WeekDayHeigth));
                        #else
            Frame = new RectangleF(Frame.Location, new SizeF(Frame.Width, (line + 1) * WeekDayHeigth));
                        #endif

            //Lines = (position == 1 ? line - 1 : line);

            if (SelectedDayView != null)
            {
                this.BringSubviewToFront(SelectedDayView);
            }
        }