ios - TableView 选中标记和取消选中并向上滚动仍然选中 Ios Swift 4 中的单元格值

Question

TableView CheckMark Cell Value Removed After Scrolling Up It will Fix TableView in You have face a problem many times to Checkmark after scroll Up then Scroll Down To show a Your Checkmark cell is will Removed Because cell is dequeueReusableCell So This Problem Fix , you Have just put Your code and Solved Your Problem.

Any More Help So Send Massage. Thank you So much. :)

class ViewController: UIViewController , UITableViewDataSource , UITableViewDelegate{

var temp = [Int]()
var numarr = [Int]()

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return numarr.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    var cell = tableView.dequeueReusableCell(withIdentifier: "id")
    cell = UITableViewCell.init(style: .default, reuseIdentifier: "id")
    cell?.textLabel?.text = String(numarr[indexPath.row])
    if temp.contains(numarr[indexPath.row] as Int)
    {
        cell?.accessoryType = .checkmark
    }
    else
    {
        cell?.accessoryType = .none
    }
    return cell!
}

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

    let cell = tableView.cellForRow(at: indexPath)
    if temp.contains(numarr[indexPath.row] as Int)
    {
        cell?.accessoryType = .none
        temp.remove(at: temp.index(of: numarr[indexPath.row])!)
    }
    else
    {
        cell?.accessoryType = .checkmark
        temp.append(self.numarr[indexPath.row] as Int)
    }
}

override func viewDidLoad() {
    super.viewDidLoad()
    for i in 1...100
    {
        numarr.append(i)
    }
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

Answer 1

我认为如果有人运行你的代码，它不会显示任何错误。但根据真实数据，它可能会。 原因是存储复选标记的方式。当您应该存储数组的实际 indexPath 时，您将行的数据存储到 temp 数组中，以便只有该行获得复选标记。在您的情况下，如果一行的标签内有 1 并且您单击它，该单元格将突出显示。现在，如果您开始滚动并且另一个单元格包含 1，那么该行也将突出显示。

我已经针对单个部分的情况修改了您的示例。如果有多个部分，则需要存储 indexPath 而不是 indexPath.row。

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    var cell = tableView.dequeueReusableCell(withIdentifier: "id")
    cell = UITableViewCell.init(style: .default, reuseIdentifier: "id")
    cell?.textLabel?.text = String(numarr[indexPath.row])
    if temp.contains(indexPath.row) {
        cell?.accessoryType = .checkmark
    } else {
        cell?.accessoryType = .none
    }
    return cell!
}

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

    let cell = tableView.cellForRow(at: indexPath)
    if temp.contains(indexPath.row) {
        cell?.accessoryType = .none
        temp.remove(at: indexPath.row)
    } else {
        cell?.accessoryType = .checkmark
        temp.append(indexPath.row)
    }
}