• Advanced iOS App Architecture by René Cacheaux & Josh Berlin - 341 pages
• iOS Test-Driven Development by Tutorials by Joshua Greene & Michael Katz
• Хабр / Разбираем iOS-приложение: код, сборка, статические и динамические библиотеки, компиляция, запуск

Interview Prep

• freeCodeCamp.org / Prepare for your iOS interview View Controller lifecycle, .frame vs .bounds in UIViews, important Swift keywords like lazy and weak