With time on my hands and having noted that rather a lot of iOS and macOS engineering jobs now emphasise SwiftUI skills, I thought it was high time that this old AppKit hand spent some time learning how to implement Swift’s ‘new’ declarative UI construction framework.

You might very well wonder why it has taken me so long. SwiftUI has been around for five and a half years – it debuted at Apple’s Worldwide Developers’ Conference in 2019. Why have I not tackled it before?