swift3 - How to change background color of events array in FSCalendar swift 3?

Question

I'm having an 2arrays of dates and want to set different colors for particular event please help how to do this.

I'm trying to implement following code but its not working its returning nil no color effects no error nothing m stucked on this please help.

import UIKit
import FSCalendar

class myCalendarViewController: UIViewController,FSCalendarDelegate,FSCalendarDataSource,FSCalendarDelegateAppearance {

    var presentdays = [String]()
    var absentdays = [String]()

@IBOutlet weak var calendar: FSCalendar!

fileprivate let gregorian: Calendar = Calendar(identifier: .gregorian)
fileprivate lazy var dateFormatter1: DateFormatter = {
   let formatter = DateFormatter()
   formatter.dateFormat = "yyyy/MM/dd"
   return formatter
}()

override func viewDidLoad() {
      super.viewDidLoad()
}

func calendar(_ calendar: FSCalendar, appearance: FSCalendarAppearance,  titleDefaultColorFor date: Date) -> UIColor? {
         presentdays = ["2017-06-03",
                        "2017-06-06",
                        "2017-06-12",
                        "2017-06-25"]

         absentdays = ["2017-06-10",
                       "2017-06-18",
                       "2017-06-15",
                       "2017-06-16"]

let datestring2 : String = dateFormatter1.string(from:date)

if presentdays.contains(datestring2)
{
    return UIColor.green
}
else if absentdays.contains(datestring2)
{
    return UIColor.red
}
else{
    return nil
}

}
   }

Answer 1

Your dateFormat of DateFormatter and string date in array doesn't match so changes the dateFormat to yyyy-MM-dd and then check array contains object or not.

fileprivate lazy var dateFormatter1: DateFormatter = {
    let formatter = DateFormatter()
    formatter.dateFormat = "yyyy-MM-dd"
    return formatter
}()