Swift - How to limit the a few specific text field only allow to insert int?

Question

How to limit the few specific text field only allow to insert int? not all text fields. only a few specific ones. Thank you.

Answer 1

Try this one.

class ViewController: UIViewController,UITextFieldDelegate {

        @IBOutlet var yourTextField: UITextField!

        override func viewDidLoad() {
            super.viewDidLoad()
            // Do any additional setup after loading the view.
            yourTextField.delegate = self
        }

        func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
            //For mobile numer validation
            if textField == yourTextField {
                //Add specific int numbers
                let allowedCharacters = CharacterSet(charactersIn:"0123 ")//Here change this characters based on your requirement
                let characterSet = CharacterSet(charactersIn: string)
                return allowedCharacters.isSuperset(of: characterSet)
            }
            return true
        }

    }