iOS Programming: The Big Nerd Ranch Guide, Second Edition

UITableView’s Data Source

The process of providing a UITableView with rows in Cocoa Touch is different from the typical procedural programming task. In a procedural design, you tell the table view what it should display. In Cocoa Touch, the table view asks another object – its dataSource – what it should display. In our case, the ItemsViewController is the data source, so it needs a way to store possession data.

In Chapter 2, you used an NSMutableArray to store Possession instances. You will do the same thing in this exercise, but with a little twist. The NSMutableArray that holds the Possession instances will be abstracted into a PossessionStore (Figure 10.5).

Figure 10.5  Homepwner object diagram

PossessionStore: a singleton

If an object wants ...