书单：

iOS Animations by Tutorials
函数式Swift
iOS开发进阶
Effective Objective-C 2.0 编写高质量iOS与OS X代码的52个有效方法

文章

Zen and the Art of the Objective-C Craftsmanship
https://github.com/objc-zen/objc-zen-book
Let's Build UITableView
https://www.mikeash.com/pyblog/friday-qa-2013-02-22-lets-build-uitableview.html

工具

FLEX
https://github.com/Flipboard/FLEX
An in-app debugging and exploration tool for iOS
Chisel
https://github.com/facebook/chisel
Chisel is a collection of LLDB commands to assist debugging iOS apps.