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ios-state-management

Implement reactive state with Combine, Observation framework, and UDF patterns. Use when implementing state management with Combine, @Observable, or reactive patterns in iOS.

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  • SKILL.md1.5 KB
  • evals/evals.json1.7 KB
  • references/implementation.md2.1 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

iOS State Management

Priority: P0 (CRITICAL)

Implementation Workflow

  1. Choose observation approach — Use @Observable (iOS 17+) for modern SwiftUI; Combine with @Published for UIKit or broader compatibility.
  2. Expose state clearly — Use UDF pattern: ViewModel exposes Input enum (events) and Output struct (state).
  3. Manage subscriptions — Store Combine subscriptions in Set<AnyCancellable> with .store(in: &cancellables).
  4. Dispatch to main thread — Use @MainActor or .receive(on: DispatchQueue.main) for UI updates.
  5. Use exhaustive ViewState — Prefer single ViewState enum (.loading, .success(data), .error(failure)).

See Combine and Observation framework examples

Anti-Patterns

  • No Uncleared Subscriptions: Always use .store(in: &cancellables)
  • No Background UI Updates: Use .receive(on: .main) or @MainActor
  • No Manual objectWillChange.send(): Use @Published or @Observable instead

References

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