Agent-skills-standard 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. (triggers: **/*.swift, Observable, @Published, PassthroughSubject, @Observable, @Namespace)

install

source · Clone the upstream repo

git clone https://github.com/HoangNguyen0403/agent-skills-standard

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/HoangNguyen0403/agent-skills-standard "$T" && mkdir -p ~/.claude/skills && cp -r "$T/skills/ios/ios-state-management" ~/.claude/skills/hoangnguyen0403-agent-skills-standard-ios-state-management && rm -rf "$T"

manifest: skills/ios/ios-state-management/SKILL.md

source content

iOS State Management

Priority: P0

Implementation Workflow

Choose observation approach — Use
```
@Observable
```
(iOS 17+) for modern SwiftUI;
```
Combine
```
with
```
@Published
```
for UIKit or broader compatibility.
Expose state clearly — Use UDF pattern: ViewModel exposes
```
Input
```
enum (events) and
```
Output
```
struct (state).
Manage subscriptions — Store Combine subscriptions in
```
Set<AnyCancellable>
```
with
```
.store(in: &cancellables)
```
.
Dispatch to main thread — Use
```
@MainActor
```
or
```
.receive(on: DispatchQueue.main)
```
for UI updates.
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

@Observable

instead

References

Combine & Observation Setup