Tableview 配件加载不正确 [英] Tableview accessories don't load correctly

问题描述

我正在尝试在我的项目中收藏的报告旁边显示一个复选标记.我成功地将标题保存到 Core Data 并成功获取它们.我将它们加载到一个名为 favourite 的数组中.然后我与加载到单元格中的标题进行比较.

I am trying to display a checkmark next to favourited reports in my project. I save the title into Core Data successfully and fetch them successfully too. I load them into an array called favourite. I then compare against the title loaded into the cell.

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
    guard let cell = tableView.dequeueReusableCell(withIdentifier: "CellClass") as? CellClass else { return UITableViewCell()}

    cell.titleLbl.text = objArray[indexPath.section].sectionObj?[indexPath.row].title ?? "no title"
    cell.descLbl.text = objArray[indexPath.section].sectionObj?[indexPath.row].authors ?? "no authors"

    if (self.favourite.count > 0)
    {
        for i in 0...self.favourite.count - 1
        {
            if (objArray[indexPath.section].sectionObj?[indexPath.row].title == favourite[i].title!)
            {
                cell.accessoryType = .checkmark
            }
        }
    }
    return cell
}

目前，我在 Core Data 中只有一条数据，所以应该显示一个复选标记，但似乎我的表格视图中每 10 个单元格有一个递归模式.

Currently, I only have one piece of data in Core Data so one checkmark should be shown but it seems there is a recursive pattern of every 10 cells in my table view.

推荐答案

单元格得到重用.每当您有条件地设置单元格的属性时，您需要在其他情况下重置该属性.

Cells get reused. Whenever you conditionally set a property of a cell, you need to reset that property in other cases.

最简单的解决方案是在循环之前(以及在 if 之前)将 accessoryType 设置为 .none.

The simplest solution is to set the accessoryType to .none before the loop (and before the if).

我也建议稍微优化一下标题.您在这段代码中多次调用 objArray[indexPath.section].sectionObj?[indexPath.row].title.做一次.

I also suggest optimizing the title a bit. You call objArray[indexPath.section].sectionObj?[indexPath.row].title many times in this code. Do it once.

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "CellClass") as! CellClass

    let title = objArray[indexPath.section].sectionObj?[indexPath.row].title ?? "no title"
    cell.titleLbl.text = title
    cell.descLbl.text = objArray[indexPath.section].sectionObj?[indexPath.row].authors ?? "no authors"

    cell.accessoryType = .none

    for favorite in self.favourite {
        if title == favourite.title {
            cell.accessoryType = .checkmark
            break // no need to keep looking
        }
    }

    return cell
}

我还展示了许多其他代码清理.

I've shown lots of other code cleanup as well.

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