如何防止在下一段中突出显示 table 行？

Question

当我 select table 行并单击 city 选项卡下的 'Ok' 时，它会突出显示该行，但是当我将选项卡更改为 town, 它突出显示 town 选项卡中的同一行，即使我没有 select it.That 如果我突出显示 city 选项卡下的第二行和第三行，它会突出显示town 选项卡下的第二行和第三行也没有我做任何事情。以下是我的代码

public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell{
    let myCell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! CityCell
    switch (segCtrl.selectedSegmentIndex)
    {
    case 0:
        myCell.myLabel.text = cityName[indexPath.row]
        break
    case 1:
        myCell.myLabel.text  = townName[indexPath.row]
        break
    default:break
    }
    return myCell
}

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){

let cell = tableView.cellForRow(at: indexPath)!
let alertController = UIAlertController(title: nil, message: nil, preferredStyle: .alert)

let ok = UIAlertAction(title: "Ok", style: .default, handler: { (action) -> Void in
    let cell = tableView.cellForRow(at: indexPath)!
    cell.backgroundColor = UIColor(white: 1.0, alpha:0.5)
    })
let cancel = UIAlertAction(title: "Cancel", style: .cancel, handler: { (action) -> Void in
})
   alertController.addAction(ok)
   alertController.addAction(cancel)
present(alertController, animated: true, completion: nil)
}

如何防止在下一个选项卡中突出显示并将其限制在我实际 select编辑该行的位置？

Answer 1

现在在您的代码中，您手动设置背景。

cell.backgroundColor = UIColor(white: 1.0, alpha:0.5)

但是您在 select 其他单元格之后没有重置 cell.backgroundColor。因此，您需要存储当前 selected cell's indexPath 并在每次 ok UIAlertAction 中 select 新单元格时调用 reloadData。在 cellForRowAtIndexPath 中，只需执行带有 selected 或未 selected 阶段的单元格。

Answer 2

我正在与 objective-c 合作。所以，抱歉，如果我的 swift 代码有误。

// global variable which carry selection-indexPath
var citySelectedIndexPaths = [IndexPath]()
var townSelectedIndexPaths = [IndexPath]()

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

    // add this line
    myCell.backgroundColor = UIColor(white: 1.0, alpha:1.0) // default color

    switch (segCtrl.selectedSegmentIndex)
    {
    case 0:
        myCell.myLabel.text = cityName[indexPath.row]
        if citySelectedIndexPaths.contains(indexPath) {
          myCell.backgroundColor = UIColor(white: 1.0, alpha:0.5)
        }
        break
    case 1:
        myCell.myLabel.text  = townName[indexPath.row]
        if townSelectedIndexPaths.contains(indexPath) {
          myCell.backgroundColor = UIColor(white: 1.0, alpha:0.5)
        }
        break
    default:break
    }
    return myCell
}

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){

let cell = tableView.cellForRow(at: indexPath)!
let alertController = UIAlertController(title: nil, message: nil, preferredStyle: .alert)

let ok = UIAlertAction(title: "Ok", style: .default, handler: { (action) -> Void in
    let cell = tableView.cellForRow(at: indexPath)!
    cell.backgroundColor = UIColor(white: 1.0, alpha:0.5)

    // save selection indexPath
    switch (segCtrl.selectedSegmentIndex)
    {
    case 0:
        if citySelectedIndexPaths.contains(indexPath) {
          let indexValue = citySelectedIndexPaths.indexOf(indexPath)
          citySelectedIndexPaths.removeAtIndex(indexValue)
        } else {
          citySelectedIndexPaths.append(indexPath);
        }
        break
    case 1:
        if townSelectedIndexPaths.contains(indexPath) {
          let indexValue = townSelectedIndexPaths.indexOf(indexPath)
          townSelectedIndexPaths.removeAtIndex(indexValue)
        } else {
          townSelectedIndexPaths.append(indexPath);
        }
        break
    default:break
    }

    })
let cancel = UIAlertAction(title: "Cancel", style: .cancel, handler: { (action) -> Void in
})
   alertController.addAction(ok)
   alertController.addAction(cancel)
present(alertController, animated: true, completion: nil)
}

如何防止在下一段中突出显示 table 行？

How to prevent highlighting of table row in next segment?

uitableview

uisegmentedcontrol

ios

swift