自定义UITableViewCell显示的值不正确

Question

我有一个UITableViewController，显示带有几个标签和自定义UIView的自定义单元格。在tableView（_ tableView：UITableView，cellForRowAt indexPath：IndexPath）方法中，似乎在重用单元格时它们不会被重置（它们看起来完全是随机的）。我该如何解决这个问题？

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let historyEntry = allHistoryEntries[indexPath.section].histories![indexPath.row]

    let cell = tableView.dequeueReusableCell(withIdentifier: cellId, for: indexPath) as! HistoryCell

    cell.dateLabel.text = "\(getDayFrom(date: (historyEntry.beginDate)!))"

    let highestBac = getHighestBac(history: historyEntry)
    cell.highestBacLabel.text = "Høyeste promille " + String(describing: Double(highestBac).roundTo(places: 2))

    cell.costLabel.text = String(describing: getNorwegianDayFrom(date: (historyEntry.beginDate!))) + " brukte du " + String(describing: calculateTotalCostBy(history: historyEntry)) + ",-"

    let goal = Double(AppDelegate.getUserData()?.goalPromille ?? 0.0)
    let red = UIColor(red: 193/255.0, green: 26/255.0, blue: 26/255.0, alpha: 1.0)
    let green = UIColor(red:26/255.0, green: 193/255.0, blue: 73/255.0, alpha: 1.0)

    let color = highestBac > goal ? red : green

    cell.highestBacLabel.textColor = color
    cell.circleView.ringColor = color

    return cell
}

这是显示颜色的图像。预期的行为是应该使用红色或绿色，而不是组合。

更新 只有ringColor显示错误的颜色。

Answer 1

所以问题是我的CircleView类中缺少调用setNeedsDisplay()。谢谢William GP。

Answer 2

如果没有默认颜色，请使用Chain 1 Chain 1 Iteration 0 Chain 1 Iteration 1 Error in file(file, ifelse(append, "a", "w")) : cannot open the connection Calls: mi -> mi -> .local -> .mi -> write.table -> file In addition: Warning message: In file(file, ifelse(append, "a", "w")) : cannot open file '/var/tmp/Rtmp0TqkWn/mi1502972500/pars_1.csv': No such file or directory Execution halted 重置颜色以清除。此功能必须在prepareForReuse()类

中

HistoryCell

Answer 3

如果需要重置某个值，例如textColor当单元格被重新出现以供重用时，您可以覆盖prepareForReuse子类（HistoryCell）中的UITableViewCell方法，如下所示：

override func prepareForReuse() {
    super.prepareForReuse() 
    //Reset label color back to default green
    let green = UIColor(red:26/255.0, green: 193/255.0, blue: 73/255.0, alpha: 1.0)
    self.highestBacLabel.textColor = green
}