How to detect current text while texting in UITextField

While typing a text in UITextField, we could get the current text with UITextFieldDelegate’s Instance Method textFieldDidChangeSelection(_:). But this method only works at iOS 13.0+, so to let other lower iOS version to use this is how it works.

Add a target to UITextField

textField.addTarget(self, action: #selector(handleTextFieldDidChange), for: .editingChanged)

Handle event when UITextField editing changed

@objc func handleTextFieldDidChange(_ textField: UITextField) {
    // handle event
    print(textField.text)   // this prints the text of textField after typing
}

On iOS 13.0+

But when your app only supports iOS 13.0+, you can use the method below.

func textFieldDidChangeSelection(_ textField: UITextField) {
    // handle event
}

Apple Document
stackoverflow