I'm glad you enjoyed it. Some parts of Chapter 5 get a bit heavy. I wanted to make sure there was useful information for both new and more experienced iOS developers. Hopefully it will make more sense the next time you go through it (having made it through once).
Chapters 6 and 7 cover saving and loading data. Once using object serialization and then using Core Data. They can also get a bit complicated--but that's almost entirely iCloud's fault. Basic object serialization is really quite easy, and Core Data isn't too bad on its own. Actually, I think iCloud is a lot easier with Core Data (it automatically handles most of the tasks we have to manually manage in Chapter 6).
Good luck expanding the app!
-Rich-
I finished Ch 5.....ok I admit most of the things a typed blindly but im not planning to move ahead until I understand ch 5. It was overwhelming for a person who worked mostly on unix! but after running that app on my iPhone4s the graph looks so beautiful.
Once i finish next chapter 6 I am hoping to add/maintain list of People and their weights (in fact we do weigh-in every Wednesday in office and we are maintaing it on white board :) I guess it should be some small project for me. Because I believe by end of Ch6. I should be able to save weight data and load it next time.
thanks rich.