Limitar textfields a N cantidad de digitos y no permitir Ceros al inicio

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool { if let text = textField.text { if text == "" && string == "0" { return false } let newLength = text.characters.count + string.characters.count - range.length return newLength <= 4 // Bool } else { return false } }

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