Tutorial follows the source below. This is the second part of a 4 part tutorial. To Download source files visit checkout.google.com Source: Dan, Pilone, Dan Pilone, Tracey Pilone, and Pilone Tracey. Head First Iphone Development: A Learner’s Guide to Creating Objective-C Applications for the Iphone. Sebastopol: O’Reilly Media, 2009. Print.