ios - 自定义扩展 UITableViewCell 有故障？

Question

这是glitch 。正如您所看到的，当我将自定义 UITableViewCell SummaryCell 从应用程序 View 中推出时，单元格出现故障并且没有放置 UILabels dayOfTheWeek和 totalAmountSpent 放在适当的位置。但如果您单击有问题的单元格，它就会恢复正常。

以下是我用来创建自定义单元格 summaryCell 的 UITableViewController SummaryTableViewController 的一些方法:

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    //Create day of week cell
    let cell = tableView.dequeueReusableCellWithIdentifier("summaryCell", forIndexPath: indexPath) as! SummaryCell
    let day = dayOfWeek[indexPath.row]

    let height = CGFloat(55)
    let dayOfWeekWidth = CGFloat(80)
    cell.dayOfWeek.text = day.rawValue.uppercaseString
    cell.dayOfWeek.frame = CGRectMake(0, 0, dayOfWeekWidth, height)
    cell.dayOfWeek.backgroundColor = colorOfDay[day]

    cell.totalAmountSpent.text = "$\(totalSpentPerDay[indexPath.row])"
    cell.totalAmountSpent.frame = CGRectMake(cell.dayOfWeek.frame.maxX + 1, 0, view.bounds.width - dayOfWeekWidth, height)
    cell.totalAmountSpent.backgroundColor = colorOfDay[day]
    cell.totalAmountSpentView.backgroundColor = colorOfDay[day]

    cell.heightOfMainView.constant = normalCellHeight 
    //^I have this to make sure the height of the cell is the same as 
    //the height of the mainView in the nib file `summaryCell` so that 
    //when the table loads intially, only the mainView of the `summaryCell` shows up.

    return cell
}

override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    if expandedCellPaths.contains(indexPath){
        let index = expandedCellPaths.indexOf(indexPath)
        expandedCellPaths.removeAtIndex(index!)
    }else{
        expandedCellPaths.append(indexPath)
    }

    //old trick to animate cell expand/collapse
    tableView.beginUpdates()
    tableView.endUpdates()
}

override func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
    let expandedCellHeight = normalCellHeight*2
    if expandedCellPaths.contains(indexPath){
        return expandedCellHeight
    }else{
        return normalCellHeight
    }
}

这是the nib file & its constraints对应于我的自定义 UITableViewCell SummaryCell

对于为什么会发生这种情况，我的 2 个最佳猜测是 (1) 我的 nib 文件 summaryCell 中的约束或(2)我的 UITableViewConroller SummaryTableViewController 中的行:

如果有人能告诉我如何修复这个故障，我将不胜感激! tableView.beginUpdates() tableView.endUpdates()

Answer 1

其实没关系!我意识到了我的错误!我只需要删除 tableView(:cellForRowAtIndexPath:) 中的这些行:

    let height = CGFloat(55)
    let dayOfWeekWidth = CGFloat(80)
    cell.dayOfWeek.frame = CGRectMake(0, 0, dayOfWeekWidth, height)
    cell.totalAmountSpent.frame = CGRectMake(cell.dayOfWeek.frame.maxX + 1, 0, view.bounds.width - dayOfWeekWidth, height)