A Windows application framework for Swift
As others have mentioned, UIKit is an Apple framework and not available on Windows, though you should be able to use the Win32 APIs to build out UI interfaces. Alternatively, you can experiment with https://github.com/compnerd/swift-win32 for a nice layer on top which abstracts out some of the details of the Win32 API. Unfortunately, that is not as fleshed out as one would like to build complex applications, but that is something which more usage and work on library should be able to resolve.
The Swift Programming Language
Note that the screenshot you shared is from an old (and AFAICT abandoned) port of Swift based upon MinGW. You should look to https://swift.org for the official releases for Windows which are more current.
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