如何在Swift中以JTAppleCalendar显示上个月、当前月和未来月

import JTAppleCalendar

class CalendarViewController: UIViewController, JTAppleCalendarViewDelegate, JTAppleCalendarViewDataSource {
    // ...
}

class CalendarViewController: UIViewController, JTAppleCalendarViewDelegate, JTAppleCalendarViewDataSource {
    var calendarView: JTAppleCalendarView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        calendarView = JTAppleCalendarView(frame: CGRect(x: 0, y: 0, width: 300, height: 300))
        calendarView.delegate = self
        calendarView.dataSource = self
        
        // 设置日历的外观和行为
        // ...
        
        view.addSubview(calendarView)
    }
    
    // ...
}

class CalendarViewController: UIViewController, JTAppleCalendarViewDelegate, JTAppleCalendarViewDataSource {
    // ...
    
    func configureCalendar(_ calendar: JTAppleCalendarView) -> ConfigurationParameters {
        let formatter = DateFormatter()
        formatter.dateFormat = "yyyy MM dd"
        formatter.timeZone = Calendar.current.timeZone
        formatter.locale = Calendar.current.locale
        
        let startDate = formatter.date(from: "2022 01 01")!
        let endDate = formatter.date(from: "2022 12 31")!
        
        let parameters = ConfigurationParameters(startDate: startDate, endDate: endDate)
        return parameters
    }
    
    func calendar(_ calendar: JTAppleCalendarView, cellForItemAt date: Date, cellState: CellState, indexPath: IndexPath) -> JTAppleCell {
        let cell = calendar.dequeueReusableJTAppleCell(withReuseIdentifier: "CustomCell", for: indexPath) as! CustomCell
        
        cell.dateLabel.text = cellState.text
        
        // 设置不同月份的日期外观
        if cellState.dateBelongsTo == .thisMonth {
            cell.dateLabel.textColor = .black
        } else {
            cell.dateLabel.textColor = .lightGray
        }
        
        return cell
    }
    
    // ...
}

class CalendarViewController: UIViewController, JTAppleCalendarViewDelegate, JTAppleCalendarViewDataSource {
    // ...
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        calendarView.register(CustomCell.self, forCellWithReuseIdentifier: "CustomCell")
        
        // ...
    }
    
    // ...
}