My project utilizes Firebase as the backend and as soon as you add that dependency - SwiftUI previews never compile, due to build time outs.
My app also uses firebase and SwiftUI with hundreds of files (views, view models, and more) with no problems.
Got working SwiftUI previews on a 50-100k LOC project with many big libs as dependencies, must be hundreds of files but havent counted. SwiftUI code is gaining share of the total UI code, probably around 20-30% now
Mock data is a must.
Need to be mindful of the preview build (+ preview simulator startup) time too, sometimes it will timeout but just building again (now warmer) will make it work
Had some initial issues around processor arch (Intel vs M1/arm), think I’m still running XCode under rosetta otherwise it wouldnt work.
it will be lightning fast compared to large xcode project... and it might even be better architecturally too, since you'd have to factor out lower level logic (view models or whatever) anyways
Not JetPack or SwiftUI works for even a simple view!. Is incredible slow and still not true to how it will show up!
I miss the way Delphi do it...