If you want to know shouldChangeCharactersInRange works in Swift? Use the following example code:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | // MARK: - UITextFieldDelegate extension MyViewController: UITextFieldDelegate { func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool { if let text = textField.text, let textRange = Range(range, in: text) { let updatedText = text.replacingCharacters(in: textRange, with: string) myvalidator(text: updatedText) } return true } } |
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