Check on UIAlertController TextField for enabling the button

Question

I have an AlertController with a text field and two button: CANCEL and SAVE. This is the code:

@IBAction func addTherapy(sender: AnyObject)
{
    let addAler         


        

Answer 1

I implemented a subclass of UIAlertController for conveniently adding text fields and associated enabling and disabling of buttons. The basic logic is similar to that Sourabh Sharma but everything is encapsulated in this subclass for tidiness. This should be helpful if your project involves a lot of such alert functionalities.

public class TextEnabledAlertController: UIAlertController {
  private var textFieldActions = [UITextField: ((UITextField)->Void)]()

  func addTextField(configurationHandler: ((UITextField) -> Void)? = nil, textChangeAction:((UITextField)->Void)?) {
      super.addTextField(configurationHandler: { (textField) in
        configurationHandler?(textField)

        if let textChangeAction = textChangeAction {
            self.textFieldActions[textField] = textChangeAction
            textField.addTarget(self, action: #selector(self.textFieldChanged), for: .editingChanged)

        }
    })

}

  @objc private func textFieldChanged(sender: UITextField) {
    if let textChangeAction = textFieldActions[sender] {
        textChangeAction(sender)
    }
  }
}

To use it, just provide a textChangeAction block when adding the text fields:

    alert.addTextField(configurationHandler: { (textField) in
        textField.placeholder = "Your name"
        textField.autocapitalizationType = .words
    }) { (textField) in
        saveAction.isEnabled = (textField.text?.characters.count ?? 0) > 0
    }

For the full example, see the git page.