A WidgetKit extension (TREKWidgets) with two parts: the next trip on the home
screen, with a countdown before it starts and today's day and next stops
while it runs, and a Live Activity for the travel day on the lock screen and
in the Dynamic Island showing the next timed stop and the day's progress.
The web app builds both from the trips stored offline on the device
(native/widgets.ts) and hands them over through TrekShell
(setWidgetSnapshot, syncTripDay, endTripDay). The texts are already
translated, so the widget needs no localisation of its own. The snapshot
lives in the keychain group the app shares with its extensions, so no App
Group is needed. Taps open com.liketrek.trek://navigate/<path>.
NativeWidgetsSync refreshes on start, on returning to the foreground and every
quarter hour. Both parts are gated behind the widgets / liveActivity
capabilities, so older binaries and the PWA are unaffected.
The relay hands APNs the encrypted record with a placeholder text and
mutable-content set; the new Notification Service Extension opens it with
the device's Web Push keys from the shared keychain group (RFC 8291 on
CryptoKit) and shows the real title, text and link. Without the keys the
placeholder stays, so a notification arrives either way and nothing on the
way reads it.
The target came in through ios/scripts/add-extension.rb (kept, idempotent),
its App ID is registered, and the release lane signs every target with its
own App Store profile. Web Push payloads now stop at 2800 bytes so the
encrypted, base64-encoded record still fits Apple's 4 KB.
Maurice