Rebuild the app on iOS 26, SwiftUI and Swift 6

[bystritskiy]

Why

The app on develop did not play. The 2019 SwiftUI rewrite left every screen as a // TODO: stub, the real game logic sat commented out in DEPRECATED/GameViewController.swift, and the project still targeted iOS 15 with Swift 5 behind a UIKit/storyboard launch path. This rebuilds it on a current stack and, in the process, makes it a working game again.

The game rules were recovered from the code that actually shipped to the App Store, which lives on master (HardcoreTap/HardcoreTap/ViewController.swift).

What changed

Project

• project.pbxproj regenerated with PBXFileSystemSynchronizedRootGroup (Xcode 16+) — sources join the target by living in the folder, no per-file entries to maintain
• iOS 15 → iOS 26, Swift 5.0 → Swift 6 language mode
• Info.plist and LaunchScreen.storyboard removed; both are generated from INFOPLIST_KEY_* build settings
• Added a unit test target; deleted the HardcoreTap for Watch scheme, which pointed at a target that has never existed in this project file

Code — 17 files replacing the previous tree

• AppDelegate + SceneDelegate + storyboard → @main App + TabView
• Game rules ported into GameEngine, on @Observable and ContinuousClock. Every method takes the current instant as a parameter rather than reading the clock, which is what lets the tests play a full round — hits, misses, tolerance decay, restart cool-down — in 11 ms
• The two hand-animated CAGradientLayers become a MeshGradient that pulses on the beat; the tolerance window is now visible as an arc on the beat ring, so the difficulty curve is legible at a glance
• Firebase, AdMob and StoreKit leftovers removed; SwiftEntryKit replaced with native toasts — the app now has zero dependencies
• Game Center moved from the long-deprecated GKScore.report to async GKLeaderboard

Tooling

• Localizable.strings → String Catalog, 58 keys with Russian translations
• 16 Swift Testing cases covering the engine and record persistence
• .swiftlint.yml: whitelist_rules → only_rules; the old key is a hard error on current SwiftLint, so linting was failing outright
• Fastfile no longer calls cocoapods — CocoaPods was removed in 2022 and the test lane has been broken since

Verification

Built, tested (16/16 passing) and run on an iPhone 17 simulator. The full loop works end to end: start → tick → missed-beat detection → game-over screen. The nickname loads from the legacy userNAME key, and the Russian locale renders correctly.

Two defects found and fixed while verifying: the s unit was not localized, and Game Center flashed a blank sheet over the app at launch.

For the reviewer

• Backwards compatibility: UserDefaults keys userNAME, highscore_normal and bgSound are kept verbatim, so an existing install keeps its nickname and record.
• Game Center sign-in is deliberately not auto-presented. GKLocalPlayer's handler fires during launch and may hand back a view controller; presenting it immediately throws a modal over the game before the player has asked for anything, and when Game Center is misconfigured that modal is blank. The leaderboard offers a button instead.
• The leaderboards do not exist in App Store Connect. The IDs in GameMode.leaderboardID are new. Until they are configured, submissions no-op and the leaderboard falls back to local records.
• Hardcore mode uses a ±0.01 s window. The original set tolerance to 0.0, which was only reachable because time was quantised to hundredths by a Timer; against a continuous clock it is unhittable. 0.01 s matches the "accurate to hundredths" the game describes.
• The 1024 app icon is composited from the existing trophy artwork over the brand gradient — no 1024 source existed in the repo. Worth replacing if the vector original is around.
• Snapfile deleted: it referenced a UI test target that has not been on this branch since 2019. Restore it alongside real UI tests if automated screenshots are wanted.

Unrelated, but worth knowing: master's Info.plist contains a live-looking Fabric API key in git history. Fabric is long dead, but this repository is public.

🤖 Generated with Claude Code