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TableViewConfiguration.md

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TableViewConfiguration

TableViewConfiguration is a class, available on DTTableViewManager instance through configuration property, that allows you to customize several aspects of UITableView and DTTableViewManager behaviors.

Displaying headers/footers on empty sections

If you don't want table view section headers to show, if data model for those sections is nil, set displayHeaderOnEmptySections property to false:

manager.configuration.displayHeaderOnEmptySections = false
manager.configuration.displayFooterOnEmptySections = false

Section styles

UITableView has two ways of displaying section headers and footers - as a view and as a title. In the latter case, String model is used to show section title.

DTTableViewManager defaults to using .title style, but automatically switches to .view style if you register a view for header or footer. You can control those behaviors:

manager.configuration.sectionHeaderStyle = .title
manager.configuration.sectionFooterStyle = .view

Semantic heights

DTTableViewManager implements tableView(_:heightForHeaderInSection:) and tableView(_:heightForFooterInSection:) delegate methods with several behaviors:

  1. Checks .displayHeader/displayFooterOnEmptySections property on TableViewConfiguration instance
  2. Checks whether header/footer model is not nil
  3. Checks whether TableViewConfiguration.sectionHeader/FooterStyle is title or view.
  4. Checks whether UITableView.Style is .plain or .grouped.

Depending on all of those, DTTableViewManager attempts to automatically return appropriate height for header/footer.

This semantic height calculation can be nice, but can be an obstacle, especially if you have a lot of sections, and therefore a lot of section headers/footers, which may hurt performance, if you are not using self-sized headers/footers. In order to give you control, this behavior can be turned off:

manager.configuration.semanticHeaderHeight = false
manager.configuration.semanticFooterHeight = false

When those properties are turned off, DTTableViewManager will pretend that tableView(_:heightForHeaderInSection:) and tableView(_:heightForFooterInSection:) delegate methods are not implemented(unless you specify reaction closure through heightForHeader/Footer methods or implement delegate methods yourself).

Minimal heights

If the height needs to be .zero, UITableView actually expects different values for .grouped(CGFloat.leastNormalMagnitude) and .plain(CGFloat.zero) styles. Those zero heights can be customized through minimalHeader/FooterHeightForTableView properties.