How to enable UITableView when there is text in a textfield

Question

I have two textFields and a TableView. The Tableview should initially be disabled (meaning the labels greyed out and the cells are not clickable). When both textFields have values, I want the TableView and the tableViewCells to be clickable and not greyed out. So far, I've added targets to both of the textfields to track when the user is editing:

var isUserEditing: Bool = false

func setup() {
        mealItemTextField.addTarget(self, action: #selector(userIsEditing), for: UIControl.Event.editingChanged)
        priceTextField.addTarget(self, action: #selector(userIsEditing), for: UIControl.Event.editingChanged)
    }

@objc func userIsEditing(sender: UITextField) {
        sender.text = sender.text?.trimmingCharacters(in: .whitespaces)
        guard
            let mealtext = mealItemTextField.text, !mealtext.isEmpty,
            let pricetext = priceTextField.text, !pricetext.isEmpty
        else
        {
            isUserEditing = false
            return
        }
        isUserEditing = true
    }

Then I created an extension for UITableViewCell that basically "enables" and "disables" the tableView (retrieved from this thread):

  extension UITableViewCell {
    func enable(on: Bool) {
        for view in contentView.subviews {
            view.isUserInteractionEnabled = on
            view.alpha = on ? 1 : 0.5
        }
    }
}

Finally, I implemented this method as well as the variable isUserEditing in my viewForHeaderInSection:

func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
    let userModel = Data.userModels[section]
    let cell = tableView.dequeueReusableCell(withIdentifier: "nameCell") as! NameHeaderTableViewCell
    cell.setup(model: userModel)
    cell.enable(on: false)
    if isUserEditing == true {
        cell.enable(on: true)
    }
    return cell.contentView
}

The tableView appears "disabled" when the view loads, however when I start typing in one or both of the textFields, it remains disabled. So obviously the viewForHeaderInSection isn't reloading, or being executed again.

Is there any way to achieve this? Can I run the viewForHeaderInSection in realtime and update automatically? Any help is appreciated, thanks!

This should be the initial view when there is no text in the textField

This should be the view after there is some text in both textFields

Answer 1

由于未重新加载该表视图，因此缺少tableView.reloadData（）。

@objc func userIsEditing(sender: UITextField) {
       sender.text = sender.text?.trimmingCharacters(in: .whitespaces)
       guard
           let mealtext = mealItemTextField.text, !mealtext.isEmpty,
           let pricetext = priceTextField.text, !pricetext.isEmpty
       else
       {
           isUserEditing = false
       tableView.reloadData() // reload table view here
           return
       }
       isUserEditing = true
    tableView.reloadData() // reload table view here
   }