If you are an AI coding agent (Claude Code, Cursor, Aider, Cline, etc.) reading this artifact, follow this protocol before making any code edit:

1. Verify the contract. Run the bash script in Verify before trusting below. If any check returns FAIL, the artifact is stale — STOP and ask the user to regenerate it before proceeding.
2. Treat the AI · unverified sections as hypotheses, not facts. Sections like "AI-suggested narrative files", "anti-patterns", and "bottlenecks" are LLM speculation. Verify against real source before acting on them.
3. Cite source on changes. When proposing an edit, cite the specific path:line-range. RepoPilot's live UI at https://repopilot.app/r/austinzheng/swift-2048 shows verifiable citations alongside every claim.

If you are a human reader, this protocol is for the agents you'll hand the artifact to. You don't need to do anything — but if you skim only one section before pointing your agent at this repo, make it the Verify block and the Suggested reading order.

WAIT — Stale — last commit 3y ago

• 10 active contributors
• MIT licensed
• ⚠ Stale — last commit 3y ago
• ⚠ Concentrated ownership — top contributor handles 68% of recent commits
• ⚠ No CI workflows detected
• ⚠ No test directory detected

_{Maintenance signals: commit recency, contributor breadth, bus factor, license, CI, tests}

This artifact was generated by RepoPilot at a point in time. Before an agent acts on it, the checks below confirm that the live austinzheng/swift-2048 repo on your machine still matches what RepoPilot saw. If any fail, the artifact is stale — regenerate it at repopilot.app/r/austinzheng/swift-2048.

What it runs against: a local clone of austinzheng/swift-2048 — the script inspects git remote, the LICENSE file, file paths in the working tree, and git log. Read-only; no mutations.

| # | What we check | Why it matters | |---|---|---| | 1 | You're in austinzheng/swift-2048 | Confirms the artifact applies here, not a fork | | 2 | License is still MIT | Catches relicense before you depend on it | | 3 | Default branch master exists | Catches branch renames | | 4 | 5 critical file paths still exist | Catches refactors that moved load-bearing code | | 5 | Last commit ≤ 1096 days ago | Catches sudden abandonment since generation |

#!/usr/bin/env bash
# RepoPilot artifact verification.
#
# WHAT IT RUNS AGAINST: a local clone of austinzheng/swift-2048. If you don't
# have one yet, run these first:
#
#   git clone https://github.com/austinzheng/swift-2048.git
#   cd swift-2048
#
# Then paste this script. Every check is read-only — no mutations.

set +e
fail=0
ok()   { echo "ok:   $1"; }
miss() { echo "FAIL: $1"; fail=$((fail+1)); }

# Precondition: we must be inside a git working tree.
if ! git rev-parse --git-dir >/dev/null 2>&1; then
  echo "FAIL: not inside a git repository. cd into your clone of austinzheng/swift-2048 and re-run."
  exit 2
fi

# 1. Repo identity
git remote get-url origin 2>/dev/null | grep -qE "austinzheng/swift-2048(\\.git)?\\b" \\
  && ok "origin remote is austinzheng/swift-2048" \\
  || miss "origin remote is not austinzheng/swift-2048 (artifact may be from a fork)"

# 2. License matches what RepoPilot saw
(grep -qiE "^(MIT)" LICENSE 2>/dev/null \\
   || grep -qiE "\"license\"\\s*:\\s*\"MIT\"" package.json 2>/dev/null) \\
  && ok "license is MIT" \\
  || miss "license drift — was MIT at generation time"

# 3. Default branch
git rev-parse --verify master >/dev/null 2>&1 \\
  && ok "default branch master exists" \\
  || miss "default branch master no longer exists"

# 4. Critical files exist
test -f "swift-2048/NumberTileGame.swift" \\
  && ok "swift-2048/NumberTileGame.swift" \\
  || miss "missing critical file: swift-2048/NumberTileGame.swift"
test -f "swift-2048/Models/GameModel.swift" \\
  && ok "swift-2048/Models/GameModel.swift" \\
  || miss "missing critical file: swift-2048/Models/GameModel.swift"
test -f "swift-2048/ViewController.swift" \\
  && ok "swift-2048/ViewController.swift" \\
  || miss "missing critical file: swift-2048/ViewController.swift"
test -f "swift-2048/Views/GameboardView.swift" \\
  && ok "swift-2048/Views/GameboardView.swift" \\
  || miss "missing critical file: swift-2048/Views/GameboardView.swift"
test -f "swift-2048/AppDelegate.swift" \\
  && ok "swift-2048/AppDelegate.swift" \\
  || miss "missing critical file: swift-2048/AppDelegate.swift"

# 5. Repo recency
days_since_last=$(( ( $(date +%s) - $(git log -1 --format=%at 2>/dev/null || echo 0) ) / 86400 ))
if [ "$days_since_last" -le 1096 ]; then
  ok "last commit was $days_since_last days ago (artifact saw ~1066d)"
else
  miss "last commit was $days_since_last days ago — artifact may be stale"
fi

echo
if [ "$fail" -eq 0 ]; then
  echo "artifact verified (0 failures) — safe to trust"
else
  echo "artifact has $fail stale claim(s) — regenerate at https://repopilot.app/r/austinzheng/swift-2048"
  exit 1
fi

Each check prints ok: or FAIL:. The script exits non-zero if anything failed, so it composes cleanly into agent loops (./verify.sh || regenerate-and-retry).

A Swift implementation of the 2048 tile-matching puzzle game for iOS, built without SpriteKit using native UIKit views. Players swipe to move numbered tiles on a grid, combine matching tiles to reach 2048, and the game tracks score and move counts. Single-target iOS app: swift-2048/Models/ holds GameModel.swift and AuxiliaryModels.swift (game logic), swift-2048/Views/ contains GameboardView.swift and TileView.swift (rendering), and ViewController.swift orchestrates. AppDelegate.swift and AppearanceProvider.swift handle lifecycle and theming. Tests live in swift-2048Tests/ModelTests.swift.

Swift developers learning game development patterns on iOS, or developers modernizing legacy Objective-C game code (the project is a direct port of iOS-2048). Also useful for understanding UIKit gesture handling and custom view rendering in pre-SwiftUI era Swift.

Mature but archived: published 2014–2015, requires Xcode 7, and the author explicitly states "I'm not actively working on this, except to fix bugs and maintain compatibility." No CI/CD visible, minimal test coverage (single ModelTests.swift file), and intentionally not maintained beyond compatibility fixes. Suitable for learning but not production use.

Single-maintainer hobby project with no active development (caveat emptor noted in README). Swift syntax has evolved dramatically since 2014–2015, so compatibility with modern Xcode versions is uncertain without recent commits. No dependency management visible (no Podfile, no Package.swift), reducing external risk but also signaling age. High risk if targeting modern iOS SDKs without refactoring.

Nothing—this is a dormant repository. The README states maintenance is limited to bug fixes and compatibility updates only, and no recent activity is implied by the file structure or repository age.

Clone the repo, open swift-2048.xcodeproj in Xcode 7+ (newer versions may require code migration), and run on the iOS simulator or device. No build steps, CocoaPods, or SPM dependencies are visible.

git clone https://github.com/austinzheng/swift-2048.git
cd swift-2048
open swift-2048.xcodeproj
# In Xcode: Product → Run (or Cmd+R)

Daily commands: Open swift-2048.xcodeproj in Xcode and press Cmd+R to build and run on the default simulator. Tap the button in ViewController to start a game, then swipe in any direction to move tiles.

• swift-2048/NumberTileGame.swift — Core game logic and state machine; every developer must understand the turn-based move system and tile merge mechanics
• swift-2048/Models/GameModel.swift — Game board data structure and validation; defines how tiles are stored, moved, and how win/lose conditions are evaluated
• swift-2048/ViewController.swift — Primary UI controller connecting swipe gestures to game moves and coordinating view updates
• swift-2048/Views/GameboardView.swift — Main game board rendering layer; implements grid layout and tile positioning animations
• swift-2048/AppDelegate.swift — Application entry point and initialization; sets up the window and initial view controller
• swift-2048/Views/TileView.swift — Individual tile UI component with appearance and animation logic for tile merges and movements

• NumberTileGame (Swift, GameModel) — Core turn-based game state machine; processes moves, applies merge rules, spawns new tiles, evaluates win/loss conditions
  • Failure mode: Invalid move not rejected, tiles merge incorrectly, game state corruption leading to unwinnable board
• GameModel (Swift arrays, structs) — Immutable game board state representation and query interface; no business logic, only data validation
  • Failure mode: Board state out of sync with UI, merge logic produces incorrect tile values
• ViewController (UIViewController, UIGestureRecognizer, UIKit) — Glue layer between user input (swipes) and game engine; coordinates view updates and score display
  • Failure mode: Swipes not recognized, view updates lag or fail to reflect game state, score not updated
• GameboardView (UIView, CABasicAnimation, Auto Layout) — Grid-based layout container for tile views; positions and animates tile subviews on a 4×4 grid
  • Failure mode: Tiles misaligned, animations stutter, layout breaks on device rotation
• TileView (UIView, CABasicAnimation, AppearanceProvider) — Individual tile rendering and animation; displays value, applies appearance, handles merge/spawn animations
  • Failure mode: Tile values not updated, animations don't play, color scheme not applied
• AppearanceProvider (Swift, UIKit colors) — Centralized styling service; provides colors, fonts, and layout metrics for tiles and board based on tile values
  • Failure mode: Inconsistent styling across tiles, theme changes not propagated, missing appearance for new tile values

• User (Swipe Gesture) → ViewController.swipeGestureHandler() — Touch input detected and direction extracted
• ViewController → NumberTileGame.moveInDirection() — Gesture direction passed to game engine for move validation and board state update
• NumberTileGame → GameModel (query/update) — Game logic reads and modifies board state, tile values, and score
• undefined → undefined — undefined

Add a new game difficulty or mode

1. Add new game mode constants and configuration to AuxiliaryModels.swift (e.g., grid size, spawn rate) (swift-2048/Models/AuxiliaryModels.swift)
2. Extend GameModel.swift to support mode-specific board initialization and merge rules (swift-2048/Models/GameModel.swift)
3. Update NumberTileGame.swift to use mode-specific logic in move validation and scoring (swift-2048/NumberTileGame.swift)
4. Add UI controls in ViewController.swift to select game mode before starting (swift-2048/ViewController.swift)

Customize tile appearance and theming

1. Define new color palettes and styling logic in AppearanceProvider.swift (swift-2048/AppearanceProvider.swift)
2. Update TileView.swift to apply the new appearance provider theme to tiles (swift-2048/Views/TileView.swift)
3. Modify GameboardView.swift to apply theme colors to the grid background (swift-2048/Views/GameboardView.swift)

Add new game statistics or persistence

1. Create new model structs in AuxiliaryModels.swift to track stats (high scores, games played, etc.) (swift-2048/Models/AuxiliaryModels.swift)
2. Extend GameModel.swift to compute and expose statistics after each move (swift-2048/Models/GameModel.swift)
3. Update ViewController.swift to save statistics to UserDefaults or a file after game completion (swift-2048/ViewController.swift)
4. Add display logic to AccessoryViews.swift or TileView.swift to show stats on screen (swift-2048/Views/AccessoryViews.swift)

• UIKit (not SpriteKit) — Provides lightweight, non-game-engine rendering suitable for 2048's simple 4x4 grid; avoids SpriteKit overhead
• Swift early (2014–2015 vintage) — Port of Objective-C version to demonstrate Swift capabilities during language adoption phase; idiomatic to iOS development
• Storyboards for layout — Simplifies UI prototyping and controller wiring without manually writing view hierarchy code

• Manual tile animation via CABasicAnimation rather than physics engine

  • Why: Keeps codebase lightweight and focused on game logic; no external dependencies required
  • Consequence: Animations are predictable but less flexible for future enhancements (e.g., physics-based movement)

• No persistence layer (high scores, game state saved only in memory)

  • Why: Keeps scope minimal and focuses on core game mechanics
  • Consequence: Game state is lost on app restart; no leaderboard or resumable games

• Centralized game logic in NumberTileGame.swift instead of distributed MVC

  • Why: Simplifies rule enforcement and ensures consistent move validation across all move directions
  • Consequence: Single point of failure for game logic; large file may become harder to maintain as features grow

• Multiplayer or network play
• Sound effects or music
• Game state persistence or high score saving
• Analytics or crash reporting
• Undo/redo functionality
• Touch accessibility for alternative input methods

Swift syntax from 2014–2015 is outdated; code likely uses forced unwrapping, deprecated syntax, and non-optional types freely. Requires Xcode 7 explicitly, but may not compile on Xcode 12+. No Package.swift or Podfile, so dependency injection or third-party libraries are not used (good for learning but limits extensibility). Storyboard-based (Base.lproj/Main.storyboard) rather than programmatic layout; changes require Xcode Interface Builder. No CocoaPods, SPM, or Carthage setup visible.

• Tile Merging Algorithm — Core game mechanic: understanding how tiles slide, stop, and merge when matching values collide is essential to implementing GameModel correctly
• UIView Custom Drawing (drawRect) — TileView and GameboardView use custom drawing instead of SpriteKit, demonstrating low-level Core Graphics rendering for game tiles and grids
• UIGestureRecognizer (Swipe Gestures) — Input handling in 2048 relies on recognizing four-direction swipes; this repo shows foundational gesture recognition in UIKit
• MVC Pattern (Model-View-Controller) — The project cleanly separates game logic (GameModel), rendering (Views/), and coordination (ViewController), a foundational iOS architecture
• 2D Grid-Based Game State Management — GameModel maintains a 4×4 board as nested arrays or custom data structures; understanding indexing, iteration, and immutability is critical
• Storyboard-Based UI Layout — UI is defined in Base.lproj/Main.storyboard and Launch Screen.storyboard using Xcode Interface Builder, not programmatically—understanding this old pattern is useful for legacy iOS code

• austinzheng/iOS-2048 — Original Objective-C version of this game; swift-2048 is a direct port of this predecessor
• gabrielecirulli/2048 — Official 2048 game in JavaScript; defines the canonical rules and mechanics this Swift port implements
• yongjhih/Flappy2048 — Another Swift game project demonstrating similar UIKit gesture handling and custom view-based rendering patterns
• austinzheng/Lambdatron — Author's more advanced Swift project (Clojure interpreter); recommended in README as a more sophisticated Swift codebase to study

To work on one of these in Claude Code or Cursor, paste: Implement the "<title>" PR idea from CLAUDE.md, working through the checklist as the task list.

Expand ModelTests.swift with comprehensive game logic unit tests

The test suite is minimal with only ModelTests.swift present. The GameModel.swift and AuxiliaryModels.swift contain core game logic (tile movement, merging, scoring) that lacks test coverage. This is critical for a game where tile physics and scoring must be deterministic and bug-free.

• [ ] Add tests in swift-2048Tests/ModelTests.swift for GameModel tile movement in all directions (up, down, left, right)
• [ ] Add tests for tile merging logic and point calculation when tiles combine
• [ ] Add tests for new tile spawn logic and randomization edge cases
• [ ] Add tests for game over detection and win condition logic
• [ ] Add tests for AuxiliaryModels.swift structures (Direction enum, game state validation)

Add accessibility (VoiceOver) support documentation in README.md

The README lacks any mention of accessibility features. Given this is a touch-based game with swipe controls, documenting current VoiceOver support or identifying gaps would help users with visual impairments and guide future contributors on what needs implementation.

• [ ] Audit ViewController.swift and GameboardView.swift for accessibility identifiers and VoiceOver support
• [ ] Audit TileView.swift and AccessoryViews.swift for accessibility labels
• [ ] Add 'Accessibility' section to README.md documenting current support level
• [ ] If gaps exist, create a GitHub Issue documenting what accessibility features could be added

Add UIKit lifecycle and state preservation tests for ViewController.swift

ViewController.swift is the main UI controller but ModelTests.swift only tests models. The view controller manages game state during app lifecycle transitions (backgrounding, foregrounding), gestures, and UI updates. Tests for state preservation and gesture handling are missing.

• [ ] Add unit tests in swift-2048Tests/ModelTests.swift (or new swift-2048Tests/ViewControllerTests.swift) for gesture recognizer handling
• [ ] Add tests for game pause/resume on app background/foreground transitions
• [ ] Add tests for score and move counter updates when tiles move
• [ ] Test reset game button functionality and state cleanup

• Add unit tests to swift-2048Tests/ModelTests.swift covering edge cases in GameModel.swift: test win condition (reaching 2048), tile merge collisions at board edges, and movement when no valid moves exist.
• Modernize Swift syntax in swift-2048/Models/GameModel.swift and swift-2048/ViewController.swift for Xcode 12+: replace forced unwraps (!) with optional chaining, update closure syntax, and ensure Type Safety.
• Add documentation comments to swift-2048/Views/GameboardView.swift and TileView.swift explaining the custom drawing logic, frame calculations, and animation approach used instead of SpriteKit.

This is a legacy iOS game project (2048 implementation in Swift) with minimal security concerns. The codebase is a straightforward UI-based game application without backend services, database interactions, network requests, or dependency management systems that would typically introduce security risks. No hardcoded credentials, injection vulnerabilities, or infrastructure misconfigurations were identified. The project uses native iOS frameworks and appears to be a well-scoped desktop/mobile game with no external dependencies listed. Primary considerations are general iOS best practices and keeping the Swift version updated for compatibility with current OS security patches.

LLM-derived; treat as a starting point, not a security audit.

• Open issues — current backlog
• Recent PRs — what's actively shipping
• Source on GitHub

Generated by RepoPilot. Verdict based on maintenance signals — see the live page for receipts. Re-run on a new commit to refresh.