Explain Cooperative Feature Architecture (CFA) in 60 seconds and draw it on a whiteboard: five boxes, two arrows, one composition root, with real Swift from a CFA app.

Cuentiva is a SwiftUI Spanish reading app from 3 Days of Swift Concurrency: StoreKit, SwiftData, on-device speech and CFA, with source-available code.

RocketLaunch (Next Rocket Launch) is a free SwiftUI teaching app with feature actors, three providers, deliberate failure handling and a GCD comparison project.

Personal API turns journal entries into a searchable dataset of your life. A public Swift Concurrency reference app with worker actors and race-condition tests.

Trend is a local-first SwiftUI weight tracker from 3 Days of Swift Concurrency: SwiftData, CloudKit sync, JSON backups and CFA, with public source.

Why 3 Days of Swift Concurrency publishes complete Swift Concurrency iOS Xcode projects on GitHub: rare real examples for developers and AI coding tools.

3 Days of Swift Concurrency is a hands-on Swift Concurrency training program for modern iOS developers: three days, one guided experience, real Xcode projects.

Swift concurrency vs Combine compared on network calls, timers and debounced search, with AsyncStream code, a decision table and a gradual migration path.

Start async work in SwiftUI with .task, .task(id:) and .refreshable, call a @MainActor ViewModel, and let feature managers own long-running tasks.

Use async/await in an iOS app layer by layer: async providers, a @MainActor feature manager with async let and cancellation, a thin ViewModel. Tested code.

Enable complete concurrency checking in Xcode or Package.swift, switch targets to Swift 6 mode, and optionally use default MainActor isolation. Tested.

Strict concurrency checking is Swift's compile-time data-race checker. See Minimal, Targeted, Complete and Swift 6 mode compared on the same code.

No deadline for Swift 6 language mode, but since 28 April 2026 App Store uploads need Xcode 26 (Swift 6.2). Here's what's required and what's optional.

Big bang, file by file or feature slices? A behaviour-first, slice-by-slice Swift 6 migration strategy with leaf modules first and tested CFA examples.

Xcode 26's Swift 6.2 compiler still builds Swift 5 mode. Learn what Swift 6 mode changes, which upcoming features it enables, and how to switch per target.

Migrate to Swift 6 feature by feature: record behaviour, enable complete checking, wrap callbacks, move state to owners, then switch targets. Tested code.

Swift 6 turns Sendable violations into errors but allows safe hand-overs with region-based isolation and sending. See what changed, compiled in each mode.

Internal structs made of Sendable parts are inferred Sendable. Public, generic or class-holding structs aren't. See each case compiled with Swift 6.2.

Make a class Sendable with final and let, a Mutex, an actor or @MainActor, and use @unchecked Sendable only as a last resort. Tested with Swift 6.2.

A @Sendable closure may run in another concurrency domain, so it can only capture Sendable values. Learn the errors, fixes and sending vs @Sendable.