[Feature]: A demo for SwiftUI project about foil

[yujinqiu]

that's neat, brilliant idea thanks. feel free to close this comment when PR is merged.
Thanks @basememara @jessesquires for your great work :-)

[jessesquires]

Hey @yujinqiu 👋🏼

I'm not entirely sure about this, I would need to experiment.

cc @basememara @JonnyBeeGod -- can either of you help here? 😊

[basememara]

Thx for the ping! I added a SwiftUI example in PR #48.

Since only one property wrapper can be implemented at a time, we have to lean on Combine to listen for changes in the .onReceive(publisher:) modifier:

@State var flagEnabled = false

VStack {
    ...
}
.onReceive(AppSettings.shared.$flagEnabled) {
    flagEnabled = $0
}

[jessesquires]

I'll review the PR soon! 😊