I recently stumbled across a series of beginner books targeted at complete new starters looking to get into iOS app development. The series goes under the name of iOS App Development for Non-Programmers by Kevin McNeish. There are 3 books in the series so far, with more promised. Available on iBooks store, and Amazon Kindle has Book 1. Get the iBooks versions if you have an iPad to read them on. They have embedded videos and tap-through diagrams.
These really are for beginners. Book 1 doesn’t have any coding in it at all. It builds an app in Xcode using standard controls. Even with a map control. The 2nd book is a beginners guide to Objective-C. I like it a lot. The 3rd book is a deeper dive into Xcode. I haven’t read the 3rd book yet. I will soon.
If you are looking to start iOS app development you could do a lot worse than get these 3 books (and the forthcoming ones when available) as a self-teaching course.
When you have read the McNeish books I’d recommend reading the iOS Apprentice. This is another beginners tutorial series. If you tackle it with the McNeish books under your belt you’ll get more from it.
After you have done both the McNeish and the iOS Apprentice tutorials there are lots of more advanced learning resources that will be accessible to you.