hoangnguyen0403/ios-state-management
skills/ios/ios-state-management/SKILL.md
Implement reactive state with Combine, Observation framework, and UDF patterns. Use when implementing state management with Combine, @Observable, or reactive patterns in iOS.
$ install --global
skillsauthnpx skillsauth add hoangnguyen0403/agent-skills-standard ios-state-managementInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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Last scanned: May 14, 2026, 2:55 AM192.9s3 files scanned
SKILL.md
- name:
- ios-state-management
- description:
- Implement reactive state with Combine, Observation framework, and UDF patterns. Use when implementing state management with Combine, @Observable, or reactive patterns in iOS.
iOS State Management
Priority: P0
Implementation Workflow
- Choose observation approach — Use
@Observable(iOS 17+) for modern SwiftUI;Combinewith@Publishedfor UIKit or broader compatibility. - Expose state clearly — Use UDF pattern: ViewModel exposes
Inputenum (events) andOutputstruct (state). - Manage subscriptions — Store Combine subscriptions in
Set<AnyCancellable>with.store(in: &cancellables). - Dispatch to main thread — Use
@MainActoror.receive(on: DispatchQueue.main)for UI updates. - Use exhaustive ViewState — Prefer single
ViewStateenum (.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@Publishedor@Observableinstead
References
- Combine & Observation Setup
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