Claude Skills by Kasempiternal

StoreKit 2 in-app purchases, subscriptions, transactions.

Use when optimizing Swift code performance - COW, ARC, generics specialization, noncopyable types, InlineArray, Span, memory layout, collection optimization, concurrency overhead

SwiftData @Model, @Query, relationships, ModelContainer, CRUD, predicates, CloudKit integration, schema migrations, performance patterns, Swift 6 concurrency

SwiftUI API reference -- navigation (NavigationStack, NavigationSplitView, Tab), layout (ViewThatFits, AnyLayout, Layout protocol, GeometryReader), containers (stacks, grids, outlines, scroll), search (.searchable, scopes, tokens), animation (Animatable, springs, keyframes, transitions, zoom), and iOS 26 Liquid Glass

SwiftUI views, layout, navigation, animations, gestures, architecture, state management, debugging, performance, iOS 26 Liquid Glass.

Swift Testing (@Test, #expect), XCUITest automation, async testing, parameterized tests, UI recording (Xcode 26), test plans, CI patterns, migration from XCTest

UIKit-SwiftUI bridging (UIViewRepresentable, UIHostingController, UIHostingConfiguration), Auto Layout debugging, CAAnimation diagnosis, @Observable shared state, gesture recognizer bridging

Computer vision with Vision framework -- subject segmentation, hand/body pose, person detection, text recognition (OCR), barcode/QR detection, document scanning, DataScannerViewController, and diagnostics

WidgetKit timeline providers, Live Activities, Dynamic Island, Control Center controls, interactive widgets, App Groups data sharing.