UITableViewCells 中的复选标记显示不正确 [英] Checkmarks in UITableViewCells showing incorrectly

问题描述

我有一个小的可滚动的 tableView，它显示大约八行，当我选择一行时会出现一个复选标记，当我再次选择它时它会消失.

I have a small scrollable tableView which displays roughly eight rows, when I select a row a checkmark appears, when I select it again it disappears.

问题是，当我向下滚动并重复使用单元格时，会自动检查更多行.跟踪哪些行需要复选标记以便不会发生这种情况的最佳做法是什么.我到处找，但没有找到有效的 Swift 解决方案.

The issue is, as I scroll down and the cells are reused, more rows are automatically checked. What is the best practice for tracking which rows require a checkmark so that this does not happen. I have looked everywhere but haven't found Swift solution that works well.

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

    let cell = tableView.dequeueReusableCellWithIdentifier("cell")! as UITableViewCell

    cell.textLabel?.text = "\(searchResults.usernameUserSearchArray[indexPath.row])"

    return cell
}

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {

    let selectedCell = tableView.cellForRowAtIndexPath(indexPath)

    if selectedCell?.accessoryType == UITableViewCellAccessoryType.Checkmark {

        selectedCell?.accessoryType = UITableViewCellAccessoryType.None

    } else {

        selectedCell?.accessoryType = UITableViewCellAccessoryType.Checkmark
    }

    tableView.reloadData()
}

推荐答案

这样的事情不适合您吗?我没有测试过，因为我不在 Mac 上.

Wouldn't something like this do it for you? I haven't tested it since I am not on my Mac.

var selectedCells = [NSIndexPath]()

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier("cell")!
    cell.accessoryType = selectedCells.contains(indexPath) ? .Checkmark : .None

    return cell
}

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    let selectedCell = tableView.cellForRowAtIndexPath(indexPath)

    selectedCells.append(indexPath)

    if selectedCell?.accessoryType == .Checkmark {

        selectedCell?.accessoryType = .None

        selectedCells = selectedCells.filter {$0 != indexPath}

    } else {

        selectedCell?.accessoryType = .Checkmark
    }
}

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