ios - CellForItemAt : index path not updating variable

Question

我正在使用一个 UITableView，它有一个带有 UISwitch 的单元格。我有四个 tableViewCells，每个都来自同一个原型(prototype)单元格。但是，当我切换开关时，TableView CellForItemAt: 部分中的变量的唯一方法是当我拉动 tableView 使其离开屏幕并重新加载可重用单元格时。如何在切换开关时刷新这些变量？

这是我的代码:

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


    if indexPath.section == 0 {
        cell.textLabel?.text = OLLItems![indexPath.row]._text
        if indexPath.row == 0 {
            GlobalData.AllGlobalData.OLLImageState = cell.state //GlobalData.AllGlobalData.OLLImageState is an struct in another file
            print("OLLImageState \(GlobalData.AllGlobalData.OLLImageState)")




        }
        if indexPath.row == 1 {
            GlobalData.AllGlobalData.OLLAlgState = cell.state
            print("OLLAlgState \(GlobalData.AllGlobalData.OLLAlgState)")

        }

    }
    if indexPath.section == 1 {
        cell.textLabel?.text = PLLItems![indexPath.row]._text
        if indexPath.row == 0 {
            GlobalData.AllGlobalData.PLLImageState = cell.state
            print("PLLImageState \(GlobalData.AllGlobalData.PLLImageState)")



        }
        if indexPath.row == 1 {
            GlobalData.AllGlobalData.PLLAlgState = cell.state 
            print("PLLAlgState \(GlobalData.AllGlobalData.PLLAlgState)")

        }

    }
    return cell
}

Answer 1

尝试这样做

Below code works properly in my repo but I changed it a bit to justify your scenario

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

        cell.mySwitch.addTarget(self, action: #selector(switchChanged(_:)), for: .valueChanged)
        return cell
    }

    func switchChanged(_ mySwitch: UISwitch) {

      guard let cell = mySwitch.superview?.superview as? SwitchContainingTableViewCell else {
          return // or fatalError() or whatever
      }

      self.value = mySwitch.isOn   //define var value in your controller or do it locally 

      let indexPath = itemTable.indexPath(for: cell)        

      if indexPath.section == 0 {
          if indexPath.row == 0 {
               GlobalData.AllGlobalData.OLLImageState = self.value
          }
      }
    }

我添加了一个 switch 目标，在目标中我得到了开关的改变状态。通过使用 state = mySwitch.isOn

，可以在 cellForItemAt: 中完成相同的操作

希望这对您有所帮助!