How to style the month cell using MonthCellLoaded event in Xamarin.Forms Calendar (SfCalendar)

You can style the month cell using theOnMonthCellLoaded event of SfCalendar in Xamarin.Forms.

You can also refer the following article.

https://www.syncfusion.com/kb/11863/how-to-style-the-month-cell-using-monthcellloaded-event-in-xamarin-forms-calendar

C#

By using the OnMonthCellLoaded you can customize the Text, BackgroudColor , BorderColor and Font by using the MonthCellLoadedEventArgs argument

this.calendar.OnMonthCellLoaded += Calendar_OnMonthCellLoaded;

private void Calendar_OnMonthCellLoaded(object sender, MonthCellLoadedEventArgs args)
{
   // As default setting Month cell Background color as Green 
   args.BackgroundColor = Color.Green;
   var appointments = calendar.DataSource as CalendarEventCollection;

   for (int i = 0; i < appointments.Count; i++)
    {
        var appointment = appointments[i];
        if (args.Date.Date == appointment.StartTime.Date)
          {
           // Setting Background color when the appointment available on the specific day 
           args.BackgroundColor = Color.Red;
          }
    }
}

Output