delegate is not set

[galblank]

In your examples you never set the delegate - this won't work for table view
this is what's missing :

`class SelectionTableVC: CollapsibleTableSectionViewController {

override func viewDidLoad() {
    super.viewDidLoad()
    delegate = self
    // Do any additional setup after loading the view.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

}`