Today's study of iOS Programming is about delegation pattern and how to create location-aware app with a map (chapter 4 and 5). It looks catchy and can teach readers important things in understandable way. I found this book is really good to study. I created a repository on Github and will push the codes there.
On the way of today's study, I read a document on Auto Reference Counting, which has been introduced in recent iOS. iOS programming seems to have been exposed to endless changing. It evolves all time through. It looks hard to just catch up with the changes, I guess. Well, all the tech-things are the same, though.