Hi all, I'm not an app developer but I have purchased several books to try and get started but here's my concern. I've noticed when a new iOS comes out some apps simply won't work on the new version but once the developer updates their app things work again. What I'm asking is why can an app stop working when the iOS is updated? My concern here is if I learn to write an app and get it published and down the line a new iOS comes out and my app stops working I'm scared I might not have the knowledge to fix it with the new iOS. Does this make sense? Any tips or info would be greatly appreciated.