The Core iOS Developer’s Cookbook, Fifth Edition

Registering Cell Classes

Register any cell type you work with early in the creation of your table view. Registration allows cell dequeuing methods to automatically create new cells for you. Typically, you register cells in your initializer or in loadView or viewDidLoad methods. Be sure that this registration takes place before the first time your table attempts to load its data. Each table view instance registers its own types. You supply an arbitrary string identifier, which you use as a key when requesting new cells.

You can register by class (starting in iOS 6) or by XIBs (iOS 5 and later). Here are examples of both approaches:

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[self.tableView registerClass:[UITableViewCell class]     forCellReuseIdentifier:@"table ...