iOS 7 Programming Fundamentals: Objective-C, Xcode, and Cocoa Basics (2014)
Part I. Language
Chapter 2. Object-Based Programming
Chapter 3. Objective-C Objects and Messages
Chapter 4. Objective-C Classes
Chapter 5. Objective-C Instances
Part II. IDE
Chapter 6. Anatomy of an Xcode Project
Chapter 9. Life Cycle of a Project
Part III. Cocoa
Chapter 12. Accessors and Memory Management
Chapter 13. Communication Between Objects