title: How to change the image on selecting date in FSCalendar in swift 3.x?
body: <p>For setting the images i am doing like this </p>
  
  <pre><code>func calendar(_ calendar: FSCalendar, imageFor date: Date) -&gt;     
        UIImage? {
      let day: Int! = self.gregorian.component(.day, from: date)
      if day == 6 || day == 10{
          return UIImage(named: "event_calender")
      }else if day == 7 || day == 14{
          return UIImage(named: "holiday_calender_line")
      }
      else if day == 7 || day == 14{
          return UIImage(named: "birthday_calender_line")
      }
      else{
           return [13,4].contains(day) ? UIImage(named: "icon_cat") : nil
      }
  }
  </code></pre>
  
  <p>but how i can change the seleted date image from this delegate method</p>
  
  <pre><code>func calendar(_ calendar: FSCalendar, didSelect date: Date, at monthPosition: FSCalendarMonthPosition) {
      print("calendar did select date \(self.formatter.string(from: date))")
  }
  </code></pre>
  
  <p>say current image is "holiday_calender_line" and on selection imwant to change with "holiday_calender_solid".</p>