import BDShelfStackViewController //import the library
…
class YourViewController: UIViewController {
…
    //A good place to create BDShelfStackViewController is in viewDidLoad
    override func viewDidLoad() {
        //The typical way to use BDShelfStackViewController
        //1. create a BDSSVData made of [BDSSVRow]
        //2. create BDShelfStackViewController with that BDSSVData
        //3. add the BDShelfStackViewController as a child ViewController to your main ViewController. Boom!
        let rows: [BDSSVRow] = [
            self.createDemoRow1(),
            self.createDemoRow2()
            ]
        //create data from the rows
        let data = BDSSVData(withRows: rows)
        //create shelf stack from the data above
        self.demoCtrl = BDShelfStackViewController(nibName:nil, bundle: nil)
        //assign data to and populate the shelf stacks.
        self.demoCtrl.createShelfStack(with: self.data)
        self.view.addSubview(self.demoCtrl)
        self.demoCtrol.view.frame = self.view.bounds
        //add the BDSSVShelfStackViewController as the main view's child viewcontroller
        self.addChildViewController(self.demoCtrl!)
    }
    
    //an example method to create a row
    private func createDemoRow1() {
        //BDSSVRow can be either horizontally or vertically scrollable

        var r = BDSSVRow(withType: .horizontal, 
                    itemCount: 30, 
                    rowHeight: 100)
        //define the size of each item 
        r.itemSize = CGSize(width: 120, height: 100)
        
        //define a block to return a UIView representing each item
        r.viewAtIndex = {
            index in
            let v = CellA(frame: CGRect(x: 0, y: 0, width: 120, height: 100))
            let item = DemoEngine.shared.nextItem
            v.imageView.image = item?.thumbnail
            v.titleLabel.attributedText = "\(item?.name ?? "")".attrText(with: 12)
            v.subtitleLabel.text = item?.artist ?? ""
            return v
        }
        
        //define the action when tapping each item
        r.didTapItem = { index in … }
        
        //there are a few more block variables used to customize each item's behavior and appearance in BDSSVRow
        return r
    }
    
    func reloadSecondStack() {
       //force reload a stack at index 1
       self.demoCtrl.reloadRow(at: 1, flash: true)
    }
}
    
    //That's it! Check out the sample project for a more detailed sample implementation