protocolAdapter.swift

// Adapter Protocol
protocol VSCollectionLabelAdapter: CollectionAdapter {
    var label: NSAttributedString { get } // required property
}

// VSLabelCollectionViewCell implements CollectionCellAdaptable
extension VSLabelCollectionViewCell: CollectionCellAdaptable {
    func update(with adapter: CollectionAdapter) {
        guard let adapter = adapter as? VSCollectionLabelAdapter else {
            fatalError("VSCollectionLabelAdapter required")
        }
        label.attributedText = adapter.label
    }
}

// Descriptor
final class VSLabelDescriptor: CollectionCellDescribable {
    let identifier: String = "VSLabelCollectionViewCell" 
    let className: String = "VSLabelCollectionViewCell"
    //...
    let adapter: VSCollectionLabelAdapter
    
    init(adapter:VSCollectionLabelAdapter) {
        self.adapter = adapter
    }
    //...
}

// An Example of an adapter
struct VSBasketHeaderAdapter: VSCollectionLabelAdapter {
    var label: NSAttributedString
    
    init() {
        let paragrapheStyle = NSMutableParagraphStyle()
        paragrapheStyle.alignment = .left
        label = NSAttributedString(string: "Basket Title".uppercased(), attributes: [
            NSParagraphStyleAttributeName : paragrapheStyle,
            NSForegroundColorAttributeName: UIColor.black(),
            NSFontAttributeName: UIFont.systemSemiBoldSmall()
        ])
    }
}

// Implementation in the data
//...
let headerSection = VSHeaderSectionDescriptor().reloadSection { cells in
    let basketHeaderAdapter = VSBasketHeaderAdapter()
    let basketHeaderDescriptor = VSLabelDescriptor(basketHeaderAdapter)
    cells.append(basketHeaderDescriptor)
}
sections.append(headerSection)
//...