- (void)loadView
{
    self.tableView = [[SLExpandableTableView alloc] initWithFrame:CGRectZero style:UITableViewStylePlain];
}

- (BOOL)tableView:(SLExpandableTableView *)tableView canExpandSection:(NSInteger)section
{
    // return YES, if the section should be expandable
}
- (BOOL)tableView:(SLExpandableTableView *)tableView needsToDownloadDataForExpandableSection:(NSInteger)section
{
    // return YES, if you need to download data to expand this section. tableView will call tableView:downloadDataForExpandableSection: for this section
}
- (UITableViewCell<UIExpandingTableViewCell> *)tableView:(SLExpandableTableView *)tableView expandingCellForSection:(NSInteger)section
{
    // this cell will be displayed at IndexPath with section: section and row 0
}

- (void)tableView:(SLExpandableTableView *)tableView downloadDataForExpandableSection:(NSInteger)section
{
    // download your data here
    // call [tableView expandSection:section animated:YES]; if download was successful
    // call [tableView cancelDownloadInSection:section]; if your download was NOT successful
}
- (void)tableView:(SLExpandableTableView *)tableView didExpandSection:(NSUInteger)section animated:(BOOL)animated
{
  //...
}
- (void)tableView:(SLExpandableTableView *)tableView didCollapseSection:(NSUInteger)section animated:(BOOL)animated
{
  //...
}