More details can be found on the related blog post at the
Always Right Institute.
At
WWDC 2019
Apple announced
SwiftUI.
A single "cross platform", "declarative" framework used to build
tvOS, macOS, watchOS and iOS
UIs.
SwiftWebUI
is bringing that to the Web ✔️
Disclaimer: This is a toy project!
Do not use for production.
Use it to learn more about SwiftUI and its inner workings.
SwiftWebUI
So what exactly is
SwiftWebUI?
It allows you to write SwiftUI
Views
which display in a web browser:
import SwiftWebUI
struct MainPage: View {
@State var counter = 0
func countUp() {
counter += 1
}
var body: some View {
VStack {
Text("?? #\(counter)")
.padding(.all)
.background(.green, cornerRadius: 12)
.foregroundColor(.white)
.onTapGesture(self.countUp)
}
}
}
Results in:
Unlike some other efforts this doesn't just render SwiftUI Views
as HTML.
It also sets up a connection between the browser and the code hosted
in the Swift server, allowing for interaction -
buttons, pickers, steppers, lists, navigation, you get it all!
In other words:
SwiftWebUI
is an implementation of (many but not all parts of) the SwiftUI API for the browser.
To repeat the
Disclaimer: This is a toy project!
Do not use for production.
Use it to learn more about SwiftUI and its inner workings.
Requirements
Update 2019-07-08: There are three options to run SwiftWebUI:
macOS Catalina
One can use a
macOS Catalina
installation to run SwiftWebUI.
Make sure that the Catalina version matches your Xcode 11 beta! (“Swift ABI” ?♀️)
Fortunately it is really easy to
install Catalina on a separate APFS volume.
And an installation of
Xcode 11
is required to get the new Swift 5.1 features SwiftUI makes heavy use of.
Got that? Very well!
Why is Catalina required? SwiftUI makes use of new Swift 5.1 runtime features
(e.g. opaque result types).
Those features are not available in the Swift 5 runtime that ships with
Mojave.
(another reason is the use of Combine which is only available in Catalina,
though that part could be fixed using
OpenCombine)
tuxOS
SwiftWebUI now runs on Linux using
OpenCombine (also works without
that, but then some things don't work, e.g. NavigationView).
A Swift 5.1 snapshot is required.
We also provide a Docker image containing a 5.1 snapshot over here:
helje5/swift.
Mojave
The Xcode 11beta iOS 13 simulators do run on Mojave.
You might be able to run SwiftWebUI within an iOS app.
SwiftWebUI Hello World
To setup a SwiftWebUI project,
create a "macOS tool project" in Xcode 11,
then use the new SwiftPM integration and add
https://github.com/SwiftWebUI/SwiftWebUI
as a dependency.
Open the main.swift file and replace it's content
with:
import SwiftWebUI
SwiftWebUI.serve(Text("Holy Cow!"))
Compile and run the app in Xcode, open Safari and hit
http://localhost:1337/:
?? AvocadoToast
A small SwiftWebUI sample based on the
SwiftUI Essentials
"Avocado Toast App".
Find it over here:
AvocadoToast.
Who
Brought to you by
The Always Right Institute
and
ZeeZide.
We like
feedback,
GitHub stars,
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presumably any form of praise you can think of.