Chapter 9 dealt with app navigation based on selections in table views, where each selection causes the top-level view, which filled the entire screen, to slide left and bring in the next view in the hierarchy. Many iPhone and iPod touch apps work this way such as Mail, which lets you drill down through mail accounts and folders until you make your way to the message. Although this approach works on the iPad, it leads to a user interaction problem.
On a screen the size of the iPhone or iPod touch, having a screen-sized view slide away ...