Top 3 Swift declarative-ui Projects

swift-cross-ui

3 478 8.5 Swift

A cross-platform declarative UI framework, inspired by SwiftUI.

Project mention: Writing Gnome Apps with Swift | news.ycombinator.com | 2024-03-27

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).

Lima

1 174 10.0 Swift

Declarative UI for iOS (by HTTP-RPC)
WorkOS

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The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
ThunderTable

0 21 0.0 Swift

A declarative wrapper approach to UITableView

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).