lazy private var _containerView: UIView = {
        let view = UIView(frame: self.view.frame)
        let tapGesture = UITapGestureRecognizer(
            target: self,
            action: Selector(("didtapContainerView:"))
        )
        view.translatesAutoresizingMaskIntoConstraints = false
        view.backgroundColor = UIColor(white: 0.0, alpha: 0)
        view.addGestureRecognizer(tapGesture)
        tapGesture.delegate = self
        return view
    }()

@objc final func didtapContainerView(gesture: UITapGestureRecognizer) {
        setDrawerState(state: .Closed, animated: true)
    }

Forsa.KYDrawerController didtapContainerView]: unrecognized selector sent to instance