UIAlertController - change size of text fields and add space between them

Question

My alert looks like this:

Is it possible to make inputs bigger and add space between them? Here is a snippet from my code. I tried changing the frame<

Answer 1

WARNING: only use this solution as a last resort! If you want to fine-tune the look of your alert controller, use a custom alert view. Take a look at this question for details.

As a hacky solution, you can use a third text field between the two as a separator and disable it. Also, you can give it a custom height using this mehtod.

To avoid getting this extra text field in focus, use the UITextFieldDelegate method textFieldShouldReturn(_:) to get the second text field to focus instead.

class AlertViewController: UITextFieldDelegate {
    [...]

    var firstTextField: UITextField!
    var secondTextField: UITextField!

    func setUpAlert() {
        [...]

        alert.addTextField { [weak self] textField in
            self?.firstTextField = textField
            textField.delegate = self
        }

        alert.addTextField { textField in
            textField.addConstraint(textField.heightAnchor.constraint(equalToConstant: 2))
            textField.isEnabled = false
        }

        alert.addTextField { [weak self] textField in
            self?.secondTextField = textField
        }

        [...]
    }

    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        if textField == firstTextField {
            secondTextField?.becomeFirstResponder()
        }

        return true
    }
}

Result:

Unfortunately, you cannot hide the extra text field, but at least you can give it a background:

textField.backgroundColor = .black

Result: