iOS

It covers Xcode 4.0, the new Xcode development environment.
Best programming book I've ever learned from.
This book holds your hand while you develop some small apps. It's insightful enough, has code and pictures. It presents basic concepts well.
I found the book helpful and useful and would strongly recommend it to others.
Generally, my opinion is that this is one of the best programming books I have so far read.
Great book, great content, but something is *seriously* wrong with the cover material.

It's an awesome book.
They have a very innovative way of teaching you and taking you through the basics all the way to the advanced stuff.
They expect you to physically think about what you're doing and practice too.
All in all, this is the best book out there for a beginner 😀

This is a great book for OSX Cocoa development in Swift.
This is a great book for learning swift and cocoa app programming.
Another excellent book from the Big Nerd Ranch.
This book is amazingly great for someone who already has experience with object-oriented development.
Excellent book. The publisher support site has updates for the last Swift version syntax.
This is undoubtedly the best introduction to Cocoa programming.
Super job of explaining what's needed to get apps written.

This is an important and useful book. Highly recommended.
This book is laid out really well, covers the essentials to the language in depth, and provides challenges to get you actually moving in the language on your own.
I highly recommend this book. Especially for beginning programmers.
This was my first book on Objective-C Programming and I'm glad I choose this particular book.
I am currently learning Objective C from this book and the explanations are great.
This is a fantastic book of exercises to learn Objective-C iOS programming.
Great introductory to Objective-C for programmers of all levels, I recommend to anyone wanting to learn this language. It also covers C briefly, and the pointer analogy is superb.

Apple iOS Operating System

iOS 7 Programming Cookbook by Vandad Nahavandipoor

iOS Programming by Joe Conway

iOS Core Animation: Advanced Techniques by Nick Lockwood

iOS 7 Programming Fundamentals by Matt Neuburg

iOS 7 User Guide – From A to Z – Tips, Tricks and all the Hidden Features for iPhone, iPad and iPod Touch by Ryan Arturo

Guide on Apple’s iOS 10 Operating System: A Step by step users guide for iOS 10 Operating Systemby Andrew Jefferson

Apple Pro Training Series: Pages, Numbers, and Keynote by Mark Wood

macOS Support Essentials 10.12 – Apple Pro Training Series: Supporting and Troubleshooting by Kevin White and Gordon Davisson

Teach Yourself VISUALLY macOS Sierra by Paul McFedries

iOS Hacker’s Handbook by Charlie Miller and Dion Blazakis