'iOS Programming' by Aaron Hillegass is a must-have for developers aiming to excel in iOS app creation. Covering from basics to advanced topics, it's packed with practical examples and exercises. Perfect for beginners and seasoned programmers alike.

'Programming In Objective-C' by Stephen Kochan is a definitive guide to mastering Objective-C, the core language for iOS and OS X app development. Ideal for beginners and experts alike, this book offers clear explanations, practical examples, and exercises to enhance learning and application skills.