How to make API call for this web service to fetch array of present and absent dates separately in swift?

Question

it was my previous question to simply display static data on FSCalendar using 2 arrays of present and absent days.

How to change background color of events array in

Answer 1

Don't use NSDictionary in Swift, you just need to use DateFormatter to get your formatted date. Also correct JSON dictionary in Swift 3 is [String:Any].

First of all declare two instance property in your class of type [String] named presentDateArray and absentDateArray.

var presentDateArray = [String]()
var absentDateArray = [String]()

Now initialize these two array in your response completion block this way.

if let responseJSON = (try? JSONSerialization.jsonObject(with: data!, options: .allowFragments)) as? [String:Any],
    let presentdetails = responseJSON["Present"] as? [[String:Any]],
    let Absentdetails = responseJSON["Absent"] as? [[String:Any]] {

     let dateFormatter = DateFormatter() 
     dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss"
     self.presentDateArray = presentdetails.flatMap { dateFormatter.date(for: $0["Date"] as! String) }.flatMap { dateFormatter1.string(from:$0) }
     self.absentDateArray = Absentdetails.flatMap { dateFormatter.date(for: $0["Date"] as! String) }.flatMap { dateFormatter1.string(from:$0) }
     DispatchQueue.main.async {
         calendar.reloadData()
     }
}

Now simply use this two array in your delegate of method of

func calendar(_ calendar: FSCalendar, appearance: FSCalendarAppearance,  titleDefaultColorFor date: Date) -> UIColor? {

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

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