Question

。

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        if indexPath.row == 0 {

            let cell = tableView.dequeueReusableCell(withIdentifier: "DateTableViewCell") as! DateTableViewCell
            cell.backgroundColor = UIColor.clear
            cell.dayOfWeekLabel.text = currentDayOfWeek
            cell.monthDateLabel.text = "\(currentMonth!) \(currentDay!)"
            cell.yearLabel.text = currentYear

            return cell
        } else if indexPath.row == 1 {

            let cell = tableView.dequeueReusableCell(withIdentifier: "MonthWeekTableViewCell") as! MonthWeekTableViewCell
            cell.selectionStyle = .none
            cell.backgroundColor = UIColor.clear
            cell.monthYear = (currentMonth,currentYear)

            return cell
        } else if indexPath.row == 2{

            let cell = tableView.dequeueReusableCell(withIdentifier: "MonthWeekTableViewCell") as! MonthWeekTableViewCell
            cell.selectionStyle = .none
            cell.backgroundColor = UIColor.clear
            cell.monthYear = ("May",currentYear)
            return cell
        } else {
            let cell = tableView.dequeueReusableCell(withIdentifier: "MonthWeekTableViewCell") as! MonthWeekTableViewCell
            cell.selectionStyle = .none
            cell.backgroundColor = UIColor.clear
            cell.monthYear = ("June",currentYear)
            return cell
        }

    }

当我向上滚动表格视图时，包含4月和5月月份的内容的单元格消失了。但是，加载视图时，我可以看到4月和5月的内容。但是，一旦我开始滚动到底部并向上滚动，就再也看不到April内容了。

单元格代码：

import UIKit

class MonthWeekTableViewCell: UITableViewCell, UICollectionViewDelegate, UICollectionViewDataSource {

    @IBOutlet weak var monthLabel: UILabel!
    @IBOutlet weak var dayCollectionView: UICollectionView!

    var monthYear: (String,String) = ("","") {
        didSet {
            monthLabel.text = self.monthYear.0

            guard let _maxDate = DateFormat.returnNumberOfDaysInMonth(month: self.monthYear.0, year: self.monthYear.1) else {fatalError("Tuple Error")}
            maxDate = _maxDate

            firstDay = DateFormat.getFirstOfMonth(year: self.monthYear.1, month: self.monthYear.0)
        }
    }
    var firstDay: Int = 0 {
        didSet {
            dayCollectionView.reloadData()
        }
    }

    var dayNumber: Int = 1

    var maxDate: Int = 30

    override func awakeFromNib() {
        super.awakeFromNib()

        dayCollectionView.delegate = self
        dayCollectionView.dataSource = self
        dayCollectionView.register(UINib(nibName: "DayCollectionViewCell", bundle: nil), forCellWithReuseIdentifier: "DayCollectionViewCell")
        dayCollectionView.backgroundColor = UIColor.clear
    }

    func numberOfSections(in collectionView: UICollectionView) -> Int {
        return 5
    }

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 7
    }


    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "DayCollectionViewCell", for: indexPath) as! DayCollectionViewCell
        if (indexPath.section != 0 || (indexPath.row + 1) >= firstDay) && dayNumber <= maxDate{

            cell.dayLabel.text = String(dayNumber)
            dayNumber += 1
            cell.backgroundColor = UIColor.clear
        } else {

            cell.isHidden = true

        }

        return cell
    }



}

Answer 1

要在两次使用之间重置单元格的状态，可以覆盖here中记录的单元格的prepareForReuse功能。当您调用dequeueReusableCell时，该函数将在单元格上被调用，因此您可以使用该函数使该单元格返回基本状态，然后再在cellForItemAt函数中对其进行重新配置。

override func prepareForReuse() {
    super.prepareForReuse() // make sure you include this
    dayNumber = 1
}

Answer 2

我意识到我的代码中有两个问题。 1）如@rpecka所述，我需要重写函数prepareForReuse

    override func prepareForReuse() {
         super.prepareForReuse()
         dayNumber = 1
    }

2）我在使用按钮时也需要取消隐藏

cell.isHidden = false

UITableViewCell内容在滚动后消失

2 个答案: