Development
The buttons weren't broken: the main thread was busy
118 green tests, a clean simulator pass, and dead buttons on a real phone. The bug was a @MainActor service doing synchronous work between awaits.
Dev log
Deep Cut Atlas
Development
Racing the main actor: when await is the race condition
@MainActor eliminates data races, not interleaving races. A generation token, a stale-failure guard, and a deterministic race test with no sleeps.
Development
My mocks couldn't fail: error injection and a Swift 6 isolation crash
Every catch branch was dead code in tests. A 15-line failure seam fixed that, and then one unannotated test suite took down the whole runner.
Development
I reviewed my own iOS app with five parallel agents: here's what they found
Five ~700-line slices, briefs that ask what's well done too, and the verification step that separated real bugs from plausible ones.
Development
Wiring up SwiftLint and GitHub Actions CI for an iOS app (and the runner that lied)
Adopting a linter on code that never had one, a framework-free pre-commit hook, and three things the macOS runner did that the docs didn't mention.
Development
StoreKit 2 lifetime unlock in a Swift 6 SwiftUI app: three things that bit me
The purchase API is the easy part. The seams between StoreKit 2, Swift 6 isolation, and SwiftUI observation are where the time went.
Development
Building a music player I can't actually hear
An inline mini-player when MusicKit playback is silent in the simulator: a two-method protocol, an honest lie of an indicator, and a bug left in on purpose.
Development
The SwiftData test that crashed with no error message
Five tests reporting a bare "Crash": a tidy helper let the ModelContainer deallocate while the store kept its context. A context is a borrowed thing.
Development
When @MainActor and TaskGroup don't mix in Swift 6
The region-based isolation checker tells me to file a bug, and the unfashionable unstructured Task turns out to be the correct tool.
Development
Apple Music gives the same album two different IDs
Building the add-to-library flow and learning that MusicKit's library and catalog copies of one album are unrelated objects, as far as their IDs go.
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