For another SwiftUI-like wrapper, see also https://github.com/stackotter/swift-cross-ui (used by Adawaita to generate widgets, and mentioned in other comments).

The key premise of this approach is to provide a SwiftUI-like declarative wrapper around Gnome functionality. It's unclear what it adds over swift-cross-ui.

SwiftUI itself has growing pains mainly around being on the right thread for processing/updates and getting data binding right.

Blog entries on swift.org or from Apple tend to be little demos that show the happy path, but when discussing new frameworks (like a Gnome wrapper) or platforms (like the recent embedded), I'd like more demonstration that the authors understand and address key issues and will sustain development. Cross-platform UI frameworks get complicated quickly and have a long tail of issues (cf Flutter, Java/Eclipse, et al) that can be blockers for clients/users. For Swift it doesn't help to have multiple concurrency models and obviously different behaviors on apple platforms and Linux (where UI is not officially tested).

Swift is such a delightful language to use, well suited for general application development. It's awesome to see it gaining traction outside of the cocoa ecosystem. If you haven't given it a fair chance yet, I would highly recommend you do!

Other things worth checking:

https://github.com/stackotter/swift-cross-ui https://github.com/TokamakUI/Tokamak

I’m also working (slowly) on native Flutter channels:

https://github.com/PADL/FlutterSwift

But this is really targeted at embedded use cases.

I'm having Deja Vu from about 20 years ago of writing Gnome apps in C# using Mono.

I feel like a cross platform Swift GUI would be a great thing for the world. Swift strikes a great balance between ergonomics and performance, and seems to be the only other mainstream language to have absorbed some of Rust's key features around borrowing references.