Creating a Marvel iOS App from scratch.. Tools, pods, tricks of the trade and more .. Part 1

https://medium.com/cocoaacademymag/creating-a-ios-app-from-sc... 
Thiago Lioy is doing a multi-part series of posts that describe how to write an iOS app from scratch in Swift using various libraries like RxSwift. 

Unsafe Swift: Using Pointers And Interacting With C

https://www.raywenderlich.com/148569/unsafe-swift 
Ray Fix writes about the unsafe parts of Swift: Using pointers and interacting with C. 

http://khanlou.com/2017/01/request-behaviors/ 
Soroush Khanlou writes a network client that wraps side effects into separate behaviors which leads to easily testable code. 

http://ericasadun.com/2017/01/05/dear-erica-singletons-and-pr... 
Another short article by Erica Sadun in which she writes about singletons and static property side effects. 

http://ericasadun.com/2017/01/06/holy-war-forced-unwrapping-u... 
Erica shares her thoughts on force unwrapped URLs. 

https://medium.com/@rodrigo.vcavalcante/iglistkit-migrating-a... 
A detailed description by Rodrigo Cavalcante on how to migrate your UITableView to IGListKit. 

Libraries & Code 

https://github.com/dani-gavrilov/GDPerformanceView-Swift 

 
A library that shows FPS, CPU usage, app and iOS versions above the status bar and reports FPS and CPU usage via delegate. 

https://github.com/willpowell8/LocalizationKit_iOS 
Realtime Dynamic localization translation delivery system for iOS in Swift. 

https://github.com/lkzhao/Hero 
Hero is a library for building iOS view controller transitions. It provides a layer on top of the UIKit's cumbersome transition APIs.