-- My question

    //TODO: alert animation
    /*
    @discardableResult
    func vcToPopIn() -> CustomerGroupTableViewController {
        guard topVC == nil else {
            return topVC!
        }

        topVC = CustomerGroupTableViewController()
        let dispatchTime = DispatchTime.now() + .seconds(1)
        DispatchQueue.main.asyncAfter(deadline: dispatchTime) {
            self.loadGroupTreeMap()
        }
        return topVC!
    }

    func dismiss() {

    }
 */

-- Solution

To use UIPresentationController to present this page, related open source project:

https://github.com/MillmanY/MMTransition