An extension on UITableView to add support for table view descriptors.

UITableViewExtension.swift

extension UITableView {
    static private let snapshotKey = "snapshot"
    
    var descriptor: UITableViewDescriptor? {
        get { objc_getAssociatedObject(self, Self.snapshotKey) as? UITableViewDescriptor }
        set {
            objc_setAssociatedObject(self, Self.snapshotKey, newValue, .OBJC_ASSOCIATION_ASSIGN)
            
            delegate = newValue
            newValue?.tableView = self
        }
    }
}