Trying to Reload FSCalendar with JSon data but it crashes

Question

this question is linked with the my previous account\'s question.

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

Answer 1

Replace the function getdateFromJSON() with

func getdateFromJSON()
        {
            let url = NSURL(string: "http://ezschoolportalapi.azurewebsites.net/api/Student/AttendanceDetails?schoolid=1&studentid=2&month=6&year=2017")
            let request = NSMutableURLRequest(url: url! as URL)
            let task = URLSession.shared.dataTask(with: request as URLRequest) { (data, response, error)
                in
                guard error == nil && data != nil else
                {
                    print("Error:",error ?? "error")
                    return
                }
                let httpstatus = response as? HTTPURLResponse
                if httpstatus?.statusCode == 200
                {
                    if data?.count != 0
                    {
                        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.presentdays = presentdetails.flatMap { dateFormatter.date(from: $0["Date"] as! String) }.flatMap {
                                self.dateFormatter1.string(from:$0)
                            }
                            self.absentdays = Absentdetails.flatMap { dateFormatter.date(from: $0["Date"] as! String) }.flatMap { self.dateFormatter1.string(from:$0) }
                            DispatchQueue.main.async
                                {
                                    self.calendar.reloadData()
                            }
                        }
                    }
                    else
                    {
                        print("No data got from URL")
                    }
                }
                else{
                    print("error httpstatus code is :",httpstatus?.statusCode ?? "5")
                }

            }
            task.resume()
        }

Please see whether the below attached image is your desired output