Objective-C for Rubyists by Mikael Konutgan
Objective-C might look like a crazy, complex and verbose language to the seasoned Rubyist.
In reality, they share many features. This allows you to use your knowledge of Ruby to quickly get started with Objective-C. In this talk, I will give an overview of the syntax and semantics of Objective-C and compare and contrast it with Ruby where appropriate.