Programming in Objective-C 2.0 provides the new programmer a complete, step-by-step introduction to the Objective-C language. The book does not assume previous experience with either C or object-oriented programming languages, and it includes many detailed, practical examples of how to put Objective-C to use in your everyday programming needs.
Objective-C has become the standard programming language for application development on the Mac OS X and iPhone platforms. A powerful yet simple object-oriented programming language that’s based on the C programming language, Objective-C is widely available not only on OS X, but across many operating systems that support the gcc compiler, including Linux, Unix, and Windows systems.
The second edition of this book has been updated and expanded to cover Objective-C 2.0. It shows not only how to take advantage of the Foundation framework’s rich built-in library of classes, but also how to use the iPhone SDK to develop programs designed specifically for the iPhone and iPod Touch.
Publisher site: http://www.informit.com/store/product.aspx?isbn=0321566157
(This is the 2nd edition of Programming in Objective-C, which was published in 2003.)