Data-Driven UI with UIKit
Preserving the theme of simplicity let’s make use of one of my favorite method from UIKit - layoutSubviews and build a data driven UI system.
Swift async-await vs closures
Swift await works by capturing the context and suspending the execution until the called async method returns. Another thing that works similarly by capturing the surrounding context is an escaping closure. So async-await calls can be imagined as equivalent to escaping closure. Whenever you see a method with async mentally replace that method with a escaping completion handler.
Introducing Simple Layout Engine
Note: This is a Swift rewrite of the original article published in 2020
SwiftUI custom layout with Simple Layout Engine
The maths required for SwiftUI custom layout reminds me of the days before AutoLayout and the constraints based system. The good thing is that Simple Layout Engine already provides a nice system to handle all the maths involved. To demonstrate I would use build the subset of the demo app from the WWDC session on this topic: Compose custom layouts with SwiftUI.
Using UnfairLock with Swift
UnfairLock seems to be causing a lot of confusion for Swift developers. Every once in a while I run across some incorrect implementation that reads like: