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role-mobile:ios-native

Expert guidance on iOS native development — Swift and SwiftUI best practices, UIKit interop, Core Data and SwiftData persistence, Combine reactive framework, structured concurrency (async/await, actors), App Clips, WidgetKit, Xcode project configuration, and Swift Package Manager. Use when buildi...

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SKILL.md

Full skill instructions

iOS Native

When to use

  • Building or optimizing a native iOS application with Swift and SwiftUI
  • Wrapping UIKit components or embedding SwiftUI inside UIKit navigation
  • Implementing Core Data or SwiftData persistence with migrations
  • Replacing Combine chains with structured concurrency (async/​await, actors)
  • Building App Clips, WidgetKit extensions, or interactive widgets (iOS 17+)
  • Configuring Xcode build settings per environment with .xcconfig files
  • Managing dependencies with Swift Package Manager and local package modules

Core principles

  1. @Observable over ObservableObject — iOS 17+ macro is less boilerplate and more precise observation; stop using @Published everywhere
  2. async let for parallelism — sequential awaits are serialized; independent async work should run concurrently
  3. Actors for shared mutable state — @MainActor for UI; custom actors for domain isolation; Sendable for cross-boundary types
  4. SwiftData for new apps, Core Data for existing — do not start a new project on a pre-iOS 17 ORM if you can avoid it
  5. SPM over CocoaPods — local packages for feature modules; the build system integration is first-class now

Reference Files

  • references/​swift-swiftui-data.md — SwiftUI property wrappers (@State, @Binding, @Observable, @Environment), UIKit interop (UIViewRepresentable, UIHostingController, Coordinator), SwiftData @Model/​@Query/​ModelContainer, Core Data NSPersistentContainer and NSFetchedResultsController, Combine operators and AnyCancellable lifecycle
  • references/​concurrency-extensions-config.md — async/​await patterns (async let, withTaskGroup, Task.detached), actor isolation (@MainActor, GlobalActor, nonisolated, Sendable), App Clips invocation and limitations, WidgetKit TimelineProvider and interactive widgets, Xcode .xcconfig per-environment configuration, SPM Package.swift local modules and binary targets