【Xcode/Swift】FSCalenderを使ってみよう

import UIKit
import FSCalendar
import CalculateCalendarLogic

class ViewController: UIViewController {
    
    @IBOutlet weak var calender: FSCalendar!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        setupCalender()
    }
    
    private func setupCalender() {
        let calendar = FSCalendar()
        calendar.dataSource = self
        calendar.delegate = self
        view.addSubview(calendar)
        self.calender = calendar
    }
    
    private let gregorian: Calendar = Calendar(identifier: .gregorian)
    private lazy var dateFormatter: DateFormatter = {
        let formatter = DateFormatter()
        formatter.dateFormat = "yyyy-MM-dd"
        return formatter
    }()
    
    // 祝日判定を行い結果を返すメソッド(True:祝日)
    private func judgeHoliday(_ date : Date) -> Bool {
        let tmpCalendar = Calendar(identifier: .gregorian)
        let year = tmpCalendar.component(.year, from: date)
        let month = tmpCalendar.component(.month, from: date)
        let day = tmpCalendar.component(.day, from: date)
        let holiday = CalculateCalendarLogic()
        return holiday.judgeJapaneseHoliday(year: year, month: month, day: day)
    }
    // date型 -> 年月日をIntで取得
    private func getDay(_ date:Date) -> (Int,Int,Int){
        let tmpCalendar = Calendar(identifier: .gregorian)
        let year = tmpCalendar.component(.year, from: date)
        let month = tmpCalendar.component(.month, from: date)
        let day = tmpCalendar.component(.day, from: date)
        return (year,month,day)
    }
    
    //曜日判定(日曜日:1 〜 土曜日:7)
    private func getWeekIdx(_ date: Date) -> Int{
        let tmpCalendar = Calendar(identifier: .gregorian)
        return tmpCalendar.component(.weekday, from: date)
    }
    
}

extension ViewController: FSCalendarDataSource, FSCalendarDelegate, FSCalendarDelegateAppearance {
    // 土日や祝日の日の文字色を変える
    func calendar(_ calendar: FSCalendar, appearance: FSCalendarAppearance, titleDefaultColorFor date: Date) -> UIColor? {
        //祝日判定をする（祝日は赤色で表示する）
        if self.judgeHoliday(date){
            return UIColor.red
        }
        
        //土日の判定を行う（土曜日は青色、日曜日は赤色で表示する）
        let weekday = self.getWeekIdx(date)
        if weekday == 1 {   //日曜日
            return UIColor.red
        }
        else if weekday == 7 {  //土曜日
            return UIColor.blue
        }
        
        return nil
    }
    
}