Lexicon

An iOS app for saving the words and phrases you want to remember.

Features

• Write a term with its definition, then edit or delete it later
• Bookmark the ones that matter most
• Search as you type, across both terms and definitions
• See at a glance when your entries are syncing, and when you're offline
• Sign in with Apple, then sign out or delete your account and its data from Settings

Technologies

Area	Choice
Platform	iOS 26
Language	Swift 6
Interface	SwiftUI
Architecture	The Composable Architecture
Backend	Firebase
Database	Cloud Firestore
Authentication	Sign in with Apple

Structure

Folder	Contents
App/	Entry point, session state machine, root view, welcome sheet, loading window
Features/	SignIn, Home, EntryForm, EntryDetail, Settings
Models/	Entry, User
Dependencies/	Auth, SignInWithApple, Entries, NetworkMonitor, Haptics
Support/	Logging, app version, shared view modifier

Each screen is a reducer and a view of the same name, and AppFeature holds whichever one the session calls for. The navigation comes from state as well, so Home owns the stack of entry details and each sheet it presents, and no view drives its own presentation.

Every side effect crosses a client with live and preview values, so no view touches Firebase and previews run without a network. A snapshot listener on users/{uid}/entries/{id} is the only source of truth for the list. That listener keeps reading from Firestore's local cache when the connection drops, and writes queue there until it returns.

Requirements

The repository carries the app but not the accounts behind it, so running Lexicon means supplying your own:

• Paid Apple Developer account, since Sign in with Apple rules out a personal team
• Team and bundle identifier in place of the ones committed in the project
• Firebase project with Apple enabled as a sign-in provider, plus Firestore
• Apple sign-in key and Services ID, which Firebase needs to revoke tokens on deletion
• GoogleService-Info.plist added to the Lexicon/ folder, where git ignores it
• Firestore rules scoped so a signed-in user reaches only their own users/{uid}