The Objective-C 2.0 Programming Language
Publisher: Apple Inc. 2009
Number of pages: 133
Objective-C is a small but powerful set of extensions to the standard ANSI C language. Objective-C is designed to give C full object-oriented programming capabilities in a straightforward way. This document is about the first component of the development environment — the programming language. It fully describes the Objective-C language, and provides a foundation for learning about the second component, the Mac OS X Objective-C application frameworks—collectively known as Cocoa.
Download or read it online for free here:
by Neil Smyth - Techotopia
The Objective-C 2.0 Essentials free 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.
by Feifan Zhou - Binpress
I will attempt to teach C and Objective-C as one language. Obj-C is a strict superset of plain C, which means that any valid C is also valid Obj-C. I will supply plenty of screenshots, and include exercises at the end of each lesson.
by B. Altenberg, A. Clarke, P. Mougin - CocoaLab
A free book for starting with Cocoa using Objective-C. It teaches you the basics of programming, in particular Objective-C programming, using Xcode. Written for non-programmers, and aimed at leveling the learning curve as much as possible.
- NeXT Software, Inc.
Objective-C is implemented as set of extensions to the C language. This book both introduces the object-oriented model that Objective-C is based upon and fully documents the language. It concentrates on the Objective-C extensions to C.