iBooks is a great bookstore for your iPhone. You can browse books on the beautiful bookshelf. You can flip through pages with a swipe or a tap to read the book contents. As you want to stop reading, you can always bookmark the current page, so that you can continue the current page later.
6 Free iOS Programming Books for Developer
- iOS Human Interface Guidelines
- Object Oriented Programming with Objective-C
- Cocoa Fundamentals Guide
- The Objective-C programming Language
- iOS Technology Overview
- iOS Application Programming Guide