import KeyboardWrapper

keyboardWrapper = KeyboardWrapper(delegate: self)

extension ViewController: KeyboardWrapperDelegate {
    func keyboardWrapper(_ wrapper: KeyboardWrapper, didChangeKeyboardInfo info: KeyboardInfo) {

        if info.state == .willShow || info.state == .visible {
            bottomConstraint.constant = info.endFrame.size.height
        } else {
            bottomConstraint.constant = 0.0
        }

        view.layoutIfNeeded()
    }
}