https://mcmizzle.com/blog/ Engineering notes from building McMizzle's apps — tvOS, watchOS, HealthKit, BLE, and the parts the documentation leaves out. en-us https://mcmizzle.com/blog/tvos-top-shelf-stale-cache/ https://mcmizzle.com/blog/tvos-top-shelf-stale-cache/ Mon, 03 Aug 2026 12:00:00 +0000 The tile drew a placeholder for hours after the code was correct again. The Home screen caches the rendered tile, dedupes incoming content against it, and that cache survives uninstalling the app — only a reboot cleared it. Plus what actually works for getting logs out of a tvOS extension, and what an extension can and can't do with an App Group. https://mcmizzle.com/blog/healthkit-widget-shows-zero/ https://mcmizzle.com/blog/healthkit-widget-shows-zero/ Mon, 27 Jul 2026 12:00:00 +0000 The widget was wrong every morning and right the moment I opened the app — but its timestamp was fresh, so it wasn't stale, it was freshly wrong. HealthKit's store is encrypted while the phone is locked, and a query that fails for that reason is indistinguishable from a day with no data unless you read the error.