ios - 单击按钮增加和减少值

Question

我想在 UIlabel 上显示值。当我按下 UIbutton 来增加或减少标签上的值时。这是我的代码，当我运行我的项目时，我的 uilabel 没有任何值(value)。

@IBAction func btnIncreaseAction(_ sender: Any) {


    var count = 0
    count = (count + 1)

   if let cell = (sender as? UIButton)?.superview?.superview?.superview as? ShoppingCell
    {
        //cell.lblForOnty.text = "\(cell.lblForOnty.text ?? 0 + 1)"
        cell.lblForOnty.text = String(count)
    }



}



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

    var someValue: Int = 0 {
        didSet {
            cell.lblForOnty.text = "\(count)"
        }
    }

    return cell
}
}

Answer 1

这是应该在您的 ViewController 中的代码。我假设 numberOfSections 是 1 并且在 numberOfRowsInSection 中你传递了你想要的行数。否则你需要修改这一行:let indexPath = IndexPath(row: sender.tag, section: 0)。

var count = 0 // Count variable should be a global variable, you need it to decrease the value too.
@objc func increaseCounter(sender: UIButton) {
    //increase logic here
    count = (count + 1)
    let indexPath = IndexPath(row: sender.tag, section: 0)
    let cell = tableView.cellForRow(at: indexPath)
    cell.lblForOnty.text = "\(count)"
}

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

    // Add tag and action to your button
    cell.yourButton.tag = indexPath.row
    cell.yourButton.addTarget(self, action: #selector(increaseCounter(sender:)), for: .touchUpInside)

    return cell
}