A very good introduction to Objective-C

There are tons of documentation on Objective-C on the internet, but most of it is written in the style of "we do it this way, because Apple says so".

Happily, there is a good intro to Objective-C by Pierre Chatelier. The intro is written in style "Objective-C for C++ developers" and it is in good details, explanations and examples.

Here is what Pierre says on the subject:

"The Objective-C language (C++ "challenger"), is not very widely spread outside MacOSX / Cocoa world. However, it is really worth studying. Unfortunately, the few documentations that can be found are targeted most of the time to OOP beginners. Therefore, an advanced C++ developer cannot find quickly the equivalents of its usual techniques : time is lost at exploring the language.

So, I have tried to gather in this document a lot of C++ and Objective-C concepts, to show how to switch from one to another and understand the Objective-C paradigms. I hope that it will help good developers to rapidly adopt Objective-C."

Taken from Pierre Chatelier's Objective-C page 

And here is the book itself

Have fun reading.