WWDC 2014 Session 226: What's New in Table and Collection Views

Adopting Dynamic Type

• Default labels already use dynamic type.
• Use +[UIFont preferredFontForTextStyle:] for custom labels.

Self-sizing Table View Cells

• Two options for self-sizing table cells:
  1. Autolayout constraints — add constraints to cell.contentView.
  2. Manual sizing — override -sizeThatFits:.
• Set UITableView’s estimatedRowHeight instead of rowHeight and set rowHeight to UITableViewAutomaticDimension on iOS 8 for self-sizing table cells.
  • In the current seed, table views unarchived from a NIB have their rowHeight property set to a constant height by default. This will change to UITableViewAutomaticDimension in a future seed.

Self-sizing Collection View Cells

• Same as table cells, use constraints or override -sizeThatFits:.
• Override -[UICollectionReusableView preferredLayoutAttributesFittingAttributes:] to adjust layout attributes determined by the UICollectionViewLayout.
• New estimatedItemSize property on UICollectionViewFlowLayout, equivalent to estimatedRowHeight on UITableView.

Invalidation Contexts

• Fine grained invalidation methods:

• Inform the collection view of a content-size change using the contentSizeAdjustment and contentOffsetAdjustment properties on UICollectionViewLayout (deltas).