ios - How to load JSON Data into FSCalendar Swift 5

Question

I am trying to load my JSON Data into FSCalendar.

I understand from the documentation that when you use an array that can be show in the calendar with the dots. I am wanting to do that same thing but instead to have the dots appear from my dates listed in my JSON file. I have loaded the JSON file into my bundle as well as made a function to load the JSON data and I have created a structure.

My problem comes in when I am trying to use an array from the structure and then load that array into the "func calendar(_ calendar: FSCalendar, numberOfEventsFor date: Date) -> Int {" function. I have been working on this for a while and could use some help. Thanks

JSON Data: - I titled the JSON file data.json

[               
    {
        "event": "Christmas",
        "date": [
            "2021-01-02",
            "2021-01-03",
            "2021-01-04"
        ]
                                        
    }
]

View Controller:

import UIKit
import FSCalendar

class ViewController: UIViewController, FSCalendarDelegate, FSCalendarDataSource, FSCalendarDelegateAppearance {
    
    //MARK: - calendar variables
    @IBOutlet var calendar: FSCalendar!
    @IBOutlet weak var dateLabel: UILabel!
    
    
    fileprivate let gregorian: Calendar = Calendar(identifier: .gregorian)
    
    fileprivate lazy var dateFormatter1: DateFormatter = {
        let formatter = DateFormatter()
        formatter.dateFormat = "yyyy/MM/dd"
        return formatter
    }()
    fileprivate lazy var dateFormatter2: DateFormatter = {
        let formatter = DateFormatter()
        formatter.dateFormat = "yyyy-MM-dd"
        return formatter
    }()
    
// These are just test data to see the dots on the calendar
    var datesWithEvents = ["2021-01-15","2021-01-16","2021-01-17","2021-01-18"]
    var datesWithMultipleEvents = ["2021-01-20","2021-01-21","2021-01-22","2021-01-23"]
    

    //MARK: - JSON variable
//    var result: Results?

    let data = DataLoader().eventData
    
    

    //MARK: - viewdidload
    override func viewDidLoad() {
        super.viewDidLoad()
        
       // parseJSON()
        let data = DataLoader().eventData
        
        print(data)
        

        calendar.delegate = self
        calendar.dataSource = self
    }
    
    deinit {
        print("(#function)")
    }
    
    
    
    //MARK: - calendar functions
    
    func calendar(_ calendar: FSCalendar, didSelect date: Date, at monthPosition: FSCalendarMonthPosition) {
        let formatter = DateFormatter()
        formatter.dateFormat = "EEEE MM-dd-YYYY"
        let string = formatter.string(from: date)
        print("(string)")
        
        
    }
    
    func calendar(_ calendar: FSCalendar, appearance: FSCalendarAppearance, eventDefaultColorsFor date: Date) -> [UIColor]? {
        let key = self.dateFormatter2.string(from: date)


// this is the test with the hard coded arrays, I think i need to 
implement the JSON here but am not sure how
        if self.datesWithMultipleEvents.contains(key) {
            return [UIColor.magenta, appearance.eventDefaultColor, UIColor.red]
        }
        return nil
    }
    
    
    func calendar(_ calendar: FSCalendar, numberOfEventsFor date: Date) -> Int {
        let dateString = self.dateFormatter2.string(from: date)

        if self.datesWithEvents.contains(dateString) {
            return 1
        }
        if self.datesWithMultipleEvents.contains(dateString) {
            return 3
        }
        return 0
    }

Data Model:

struct EventsData: Codable {
    
    var event: String
    var date: [String]
}

JSON loader:

import Foundation

public class DataLoader {
    
    @Published var eventData = [EventsData]()
    
    init() {
        load()
    }
    
    func load() {
    
        if let fileLocation = Bundle.main.url(forResource: "data", withExtension: "json") {
            
            //do catch incase of error
            do {
                let data = try Data(contentsOf: fileLocation)
                let jsonDecoder = JSONDecoder()
                let dataFromJson = try jsonDecoder.decode([EventsData].self, from: data)
                
                self.eventData = dataFromJson
                
            } catch {
                print(error)
            }
            
        }
    }
}

EDIT:

func calendar(_ calendar: FSCalendar, numberOfEventsFor date: Date) -> Int {
    let dateString = self.dateFormatter2.string(from: date)
    
    if self.eventData.contains(where: //<#T##(EventsData) throws -> Bool#>) //How to get this to do the contains like in the next if statement
    

    if self.datesWithEvents.contains(dateString) {
        return 1
    }
    if self.datesWithMultipleEvents.contains(dateString) {
        return 3
    }
    return 0
}

question from:https://stackoverflow.com/questions/65600475/how-to-load-json-data-into-fscalendar-swift-5

Answer 1

Check if you have this in your code:

// FSCalendarDataSource
func calendar(calendar: FSCalendar!, hasEventForDate date: NSDate!) -> Bool {
    return shouldShowEventDot
}