// LeftIconTableViewCell.swift
class LeftIconTableViewCell: UITableViewCell, ReusableViewProtocol {
    typealias RegisterType = RegisterNib
}

// ViewController.swift
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell: UITableViewCell?
    let alphabet = String(describing: UnicodeScalar("A".unicodeScalars.first!.value + UInt32(indexPath.row))!)
    switch indexPath.row % 2 {
    case 0:
        cell = tableView.dequeue(with: LeftIconTableViewCell.self) { cell in
            cell.alphabetLabel.text = alphabet
            cell.randomBackgoundColor()
        }
    case 1:
        cell = tableView.dequeue(with: RightIconTableViewCell.self) { cell in
            cell.alphabetLabel.text = alphabet
        }
    default:
        cell = tableView.dequeueReusableCell(withIdentifier: "UITableViewCell")
    }
    return cell!
}

// ReusableHeaderView.swift
class LeftIconTableViewCell: UICollectionReusableView, ReusableViewProtocol {
    typealias RegisterType = RegisterClass
}

// ViewController.swift
func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
    let reusableView: UICollectionReusableView? = nil
    switch UICollectionView.ElementKind(rawValue: kind) {
        case .Some(.Header):
            return collectionView.dequeue(with: ReusableHeaderView.self, of: .Header, for: indexPath) { view in
                view.backgroundColor = .redColor()
            }
        case .Some(.Footer):
            return collectionView.dequeue(with: ReusableHeaderView.self, of: .Footer, for: indexPath) { view in
                view.backgroundColor = .blueColor()
            }
        default:
            return reusableView
    }
}