Whats New Skill for Claude

Glob: **/*WhatsNew*.swift, **/*Changelog*.swift, **/*ReleaseNotes*.swift, **/*VersionTracker*.swift
Grep: "WhatsNew" or "whatsNew" or "lastShownVersion" or "changelog"

Grep: "CFBundleShortVersionString" or "Bundle.main.infoDictionary" or "appVersion"

WhatsNew/
├── WhatsNewFeature.swift       # Single feature model
├── WhatsNewRelease.swift       # Version-grouped features
├── VersionTracker.swift        # Version persistence & comparison
├── WhatsNewProvider.swift      # Content provider protocol + local impl
├── WhatsNewView.swift          # Paged feature display
├── WhatsNewSheet.swift         # Auto-presenting sheet wrapper
└── RemoteWhatsNewProvider.swift # Remote content (optional)

@main
struct MyApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
                .whatsNewSheet()  // Automatically shows after updates
        }
    }
}

@main
struct MyApp: App {
    @State private var whatsNewRelease: WhatsNewRelease?

    var body: some Scene {
        WindowGroup {
            ContentView()
                .sheet(item: $whatsNewRelease) { release in
                    WhatsNewView(release: release)
                }
                .task {
                    let tracker = VersionTracker()
                    if tracker.shouldShowWhatsNew() {
                        whatsNewRelease = WhatsNewProvider.local.latestRelease()
                    }
                }
        }
    }
}

struct HomeView: View {
    @State private var tracker = VersionTracker()

    var body: some View {
        VStack {
            if tracker.shouldShowWhatsNew(),
               let release = WhatsNewProvider.local.latestRelease() {
                WhatsNewView(release: release) {
                    tracker.markVersionAsShown()
                }
            }
            // Rest of home content...
        }
    }
}

// In LocalWhatsNewProvider.swift — add a new entry per release
static let releases: [WhatsNewRelease] = [
    WhatsNewRelease(
        version: "2.1.0",
        date: Date(timeIntervalSince1970: 1_700_000_000),
        features: [
            WhatsNewFeature(
                title: "Dark Mode Support",
                description: "Full dark mode across all screens.",
                systemImage: "moon.fill",
                tintColor: .indigo
            ),
            WhatsNewFeature(
                title: "Faster Search",
                description: "Search results now appear instantly.",
                systemImage: "magnifyingglass",
                tintColor: .orange
            ),
        ]
    ),
    // Previous releases...
]

@Test
func showsWhatsNewForNewVersion() {
    let defaults = UserDefaults(suiteName: "TestWhatsNew")!
    defaults.removePersistentDomain(forName: "TestWhatsNew")

    let tracker = VersionTracker(
        defaults: defaults,
        currentVersion: "2.0.0"
    )

    // First launch — no previous version stored
    #expect(tracker.shouldShowWhatsNew() == true)

    tracker.markVersionAsShown()
    #expect(tracker.shouldShowWhatsNew() == false)
}

@Test
func skipsWhatsNewWhenVersionUnchanged() {
    let defaults = UserDefaults(suiteName: "TestWhatsNew2")!
    defaults.removePersistentDomain(forName: "TestWhatsNew2")

    let tracker = VersionTracker(
        defaults: defaults,
        currentVersion: "1.5.0"
    )
    tracker.markVersionAsShown()

    // Same version — should not show
    let tracker2 = VersionTracker(
        defaults: defaults,
        currentVersion: "1.5.0"
    )
    #expect(tracker2.shouldShowWhatsNew() == false)
}

@Test
func showsWhatsNewAfterUpdate() {
    let defaults = UserDefaults(suiteName: "TestWhatsNew3")!
    defaults.removePersistentDomain(forName: "TestWhatsNew3")

    let tracker = VersionTracker(
        defaults: defaults,
        currentVersion: "1.0.0"
    )
    tracker.markVersionAsShown()

    // Simulate update
    let trackerAfterUpdate = VersionTracker(
        defaults: defaults,
        currentVersion: "2.0.0"
    )
    #expect(trackerAfterUpdate.shouldShowWhatsNew() == true)
}

// Show features for all versions newer than lastShownVersion
func featuresSinceLastShown() -> [WhatsNewFeature] {
    let lastShown = tracker.lastShownVersion ?? "0.0.0"
    return releases
        .filter { $0.version.compare(lastShown, options: .numeric) == .orderedDescending }
        .flatMap(\.features)
}

if let release = provider.release(for: currentVersion),
   tracker.shouldShowWhatsNew() {
    // Present What's New
}

let provider = RemoteWhatsNewProvider(
    endpoint: URL(string: "https://api.example.com/whats-new")!,
    fallback: LocalWhatsNewProvider()  // Offline fallback
)
let release = try await provider.latestRelease()

func shouldShowWhatsNew() -> Bool {
    guard let lastShown = lastShownVersion else {
        // First install — mark current version, don't show
        markVersionAsShown()
        return false
    }
    return currentVersion.compare(lastShown, options: .numeric) == .orderedDescending
}