JTAppleCalendar -如何停止随机重复的单元格？

func calendar(_ calendar: JTAppleCalendarView, cellForItemAt date: Date, cellState: CellState, indexPath: IndexPath) -> JTAppleCell {
    let cell = calendar.dequeueReusableJTAppleCell(withReuseIdentifier: "CustomCell", for: indexPath) as! CustomCell
    
    // 在这里对cell进行配置
    
    return cell
}

var displayedDates: [Date] = []

if displayedDates.contains(date) {
    // 日期已经显示过，不再重复显示
    cell.isHidden = true
} else {
    // 日期未显示过，进行配置并显示
    cell.isHidden = false
    displayedDates.append(date)
}