Как сделать выпадающий список?

TabelView

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        if (destinationData?[indexPath.row]) != nil {
            if(indexPath.row + 1 >= (destinationData?.count)!) {
                expandCell(tableView: tableView, index: indexPath.row)
            }
            else {
                if(destinationData?[indexPath.row+1] != nil) {
                    expandCell(tableView: tableView, index: indexPath.row)
                    // Close Cell (remove ExpansionCells)
                } else {
                    contractCell(tableView: tableView, index: indexPath.row)
                }
            }
        }
    }
    
    /*  Expand cell at given index  */
    private func expandCell(tableView: UITableView, index: Int) {
        if let infoMain = destinationData?[index]?.infoMain {
            var indexesToInsert = [IndexPath]()
            for i in 1...infoMain.count {
                destinationData?.insert(nil, at: index + 1)
                indexesToInsert.append(IndexPath(row: index + i, section: 0))
            }
            tableView.insertRows(at: indexesToInsert , with: .left)
            tableView.scrollToRow(at: IndexPath(row: index + 1, section: 0), at: .bottom, animated: true)
        }
    }
    
    /*  Contract cell at given index    */
    private func contractCell(tableView: UITableView, index: Int) {
        if let infoMain = destinationData?[index]?.infoMain {
            var indexesToDelete = [IndexPath]()
            for i in 1...infoMain.count {
                destinationData?.remove(at: index + 1)
                indexesToDelete.append(IndexPath(row: index + i, section: 0))
            }
            tableView.deleteRows(at: indexesToDelete, with: .left)
        }
    }