This introduction is excellent, it's aimed at programmers who wants to get a first and painless overview on how Objective-C is coded and how to read Objective-C

This introduction is excellent, it's aimed at programmers who wants to get a first and painless overview on how Objective-C is coded and how to read Objective-C code. It gives you all the subtleties of the language, compared to the other (the unusual method calling syntax being the first). It's kind of a starting blocks for learning a new language, exactly what I look for when I learn a new langage.