Free Objective C Resources
Ry’s Objective-C Tutorial
Objective-C is the native programming language for Apple’s iOS and OS X operating systems. This looks like a pretty good place to get started with Objective C, designed to serve as both a concise quick-reference and a comprehensive introduction.
Objective-C 2.0 Essentials
The Objective-C 2.0 Essentials online book contains 34 chapters of detailed information intended to provide everything necessary to gain proficiency as an Objective-C programmer for both Mac OS X and iPhone development. Also covers installing and using GNUstep and Objective-C on Windows.
WikiBook on Objective C
Familiarity with the c programming language is assumed.
Objective C Programming Tutorials
65 short free video tutorials for Objective-C, beginning with setting pu Xsode on a Mac.
This reference will take you through simple and practical approach while learning Objective-C Programming language.
OBJECT-ORIENTED PROGRAMMING AND THE OBJECTIVE-C LANGUAGE
The book is intended for readers who might be interested in: Learning about object-oriented programming, Finding out about the OPENSTEP development environment, or Programming in Objective-C.
Cocoa Dev Central tutorial on Objective-C
Programming with Objective-C
A Mac Developer Library site for learning Objective-C, the primary programming language used when writing software for OS X and iOS, this is part tutorial, part reference.
Objectively Speaking: A Crash Course in Objective-C
Assumes an Apple developer account with the provisioning details set up and the latest version of Xcode installed.