KeyboardManager conflicts with system keyboard movement: How to resolve?

[make1a]

When I use

 class InputAccessoryExampleViewController: CommonTableViewController {

    // MARK: - Properties

    override var inputAccessoryView: UIView? {
        return inputBar
    }

    override var canBecomeFirstResponder: Bool {
        return true
    }

    // MARK: - View Life Cycle

    override func viewDidLoad() {
        super.viewDidLoad()
    }

}

I can touch the inputBar to make the system keyboard move down with my gesture. However, our design strongly requires that I have the same effect when using keyboardManager, instead of sliding down to the system keyboard before it moves down. How can I implement this feature?