Reference to learn Cocoa.

An excellent book learning and everything is there: work advice, theoretical presentation, practice and exercises. All Cocoa facets is discussed in a clear and progressive way. It was through this book that I program today on my mac.

Attention any time this book is a true copy by the practice of Cocoa. Just change the editor, I invite you to check before buying any editor offers the latest version. It's always easier when the screenshots corresponds to the version of xCode you use.