I've spent quite some time searching the Internet for a book specifically about SwiftUI for macOS. There just seems not to exist any such book, except some older ones covering Swift 2.0. There is an enormous amount of books and online courses about SwiftUI for iOS, but almost nothing about SwiftUI for macOS.
Makes me wonder whether everything once learned for SwiftUI for iOS can also be applied the same way for macOS. But the iPad has a much simple GUI than macOS. So I don't think that this is the case.
I would be thankful for any links to some books about SwiftUI development for macOS or some online course.
I believe Hacking With Swift has some coverage of this in SwiftUI by Example and Hacking with MacOS. The former can be read for free, but the later must be bought. Sadly, this doesn't seem to be a very sought after topic, as most courses ignore it completely in favor of SwiftUI on iOS.
Thanks for the links, Nobody. Those things seem to be quite useful :-). Found now some useful videos on Youtube and some online course on Apple's homepage.
You can cover a lot of ground with iOS examples. Swift is the same on both platforms and the vast bulk of SwiftUI stuff applies to the Mac as well. For the Mac-specific differences, I’ve often find useful info in the various TrozWare posts.