UITableView Prefetching

Extending our example from episode 309, here we implement automatic tableview paging support by utilizing the UITableViewDatasourcePrefetching protocol. With this protocol, our delegate is notified of upcoming rows the user is about to encounter, and gives us an opportunity to preemptively load data for those rows.

This is a companion discussion topic for the original entry at https://nsscreencast.com/episodes/315-tableview-prefetching