Cool articles iOS development related:
ARC and memory management in Swift:
https://www.raywenderlich.com/966538-arc-and-memory-management-in-swift
Drawing Smooth https://useyourloaf.com/blog/exploring-the-swift-standard-library-source-code/2D Graphs using UIBezierPath:
[https://code.allaboutapps.at/articles/smooth-graph-lines/]
Empty Strings in Swift:
https://useyourloaf.com/blog/empty-strings-in-swift/
Exploring the Swift standard library source code:
https://useyourloaf.com/blog/exploring-the-swift-standard-library-source-code/
How to save images and videos to Core Data efficiently:
http://www.vadimbulavin.com/how-to-save-images-and-videos-to-core-data-efficiently/
Memory management with heaps&stacks:
https://medium.com/@sarinyaswift/memory-management-with-heaps-stacks-swift-3be2a3e9e1c3
Understand ARC:
https://makeapppie.com/2019/05/08/understand-arc/
Haptic feedback in iOS Apps:
https://mecid.github.io/2019/05/09/haptic-feedback-in-ios-apps/
Swift: Enums vs Protocols:
https://www.objc.io/blog/2019/05/07/enums-vs-protocols/
Getting up to speed with UICollectionView layouts:
https://www.kairadiagne.com/2019/04/27/getting-up-to-speed-with-uicollectionviewlayout.html
Free course about reverse engineering iOS App:
https://github.com/ivRodriguezCA/RE-iOS-Apps
15 tips to optimize your SpriteKit game:
https://www.hackingwithswift.com/articles/184/tips-to-optimize-your-spritekit-game
Using CryptoSwift:
https://agostini.tech/2019/03/31/using-cryptoswift/
Swift UTF8-String:
https://swift.org/blog/utf8-string/
Dive deep into Swift string:
https://flawlessapp.io/blog/dive-deep-into-swift-string/
Creating an infinite grid on iOS:
https://itnext.io/creating-an-infinite-grid-on-ios-2bd6db28c581
Introducing Twitter Network Layer for iOS (TNL):
https://blog.twitter.com/engineering/en_us/topics/open-source/2018/opensourcetnl.html