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SOLID principles for Swift 6 and SwiftUI (iOS 26+). Files < 100 lines, protocols separated, @Observable, actors, Preview-driven development. Features Modular MANDATORY.
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Before ANY implementation, use `TeamCreate` to spawn 3 agents:
references/anti-patterns.mdreferences/concurrency-patterns.mdreferences/dependency-inversion.mdreferences/interface-segregation.mdreferences/liskov-substitution.mdreferences/open-closed.mdreferences/single-responsibility.mdreferences/solid-principles.mdreferences/templates/model.mdreferences/templates/protocol.mdreferences/templates/service.mdreferences/templates/view.mdreferences/templates/viewmodel.mdSwift 6 fundamentals for all Apple platforms. Use when implementing concurrency, architecture, testing, i18n, or performance optimization across iOS, macOS, iPadOS, watchOS, visionOS.
Guides iOS app architecture using Swift 6, iOS 18+, SwiftUI, SwiftData, Observation framework, and concurrency. Modernizes legacy patterns like Core Data, ObservableObject, and GCD.
Applies Swift 6+ best practices for iOS/macOS code including concurrency (async/await, actors, MainActor, Sendable), API design, typed throws, and Swift 6 migration.
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Before ANY implementation, use TeamCreate to spawn 3 agents:
Before writing ANY new code:
Core/Extensions/, Core/Utilities/, Core/Protocols/Core/ directly| Layer | Location | Max Lines |
|---|---|---|
| Views | Features/[Feature]/Views/ | 80 |
| ViewModels | Features/[Feature]/ViewModels/ | 100 |
| Services | Features/[Feature]/Services/ | 100 |
| Protocols | Features/[Feature]/Protocols/ | 30 |
| Shared | Core/{Models,Protocols,Services,Extensions,Utilities}/ | - |
NEVER use flat Sources/ structure - always Features/[Feature]/
| Rule | Value |
|---|---|
| File limit | 100 lines (split at 90) |
| ViewModels | @MainActor @Observable |
| Protocols | Features/[Feature]/Protocols/ or Core/Protocols/ ONLY |
| Models | Sendable structs |
| Documentation | /// on all public APIs |
| Previews | Every View MUST have #Preview |
| Topic | Reference | When to consult |
|---|---|---|
| SOLID Overview | solid-principles.md | Quick reference all principles |
| SRP | single-responsibility.md | Fat views/VMs, splitting files |
| OCP | open-closed.md | Adding providers, extensibility |
| LSP | liskov-substitution.md | Protocol contracts, testing |
| ISP | interface-segregation.md | Fat protocols, splitting |
| DIP | dependency-inversion.md | Injection, testing, mocking |
| Concurrency | concurrency-patterns.md | Actors, @MainActor, Sendable |
| Anti-Patterns | anti-patterns.md | Code smells detection |
| Template | When to use |
|---|---|
| view.md | SwiftUI View with subviews and #Preview |
| viewmodel.md | @Observable ViewModel with @MainActor |
| service.md | API Service, Mock, Cache actor |
| protocol.md | Service protocol, CQRS, Auth |
| model.md | Model, DTO, Error, Enum |
| Anti-Pattern | Fix |
|---|---|
| Files > 100 lines | Split at 90 |
| Protocols in impl files | Move to Protocols/ directory |
ObservableObject | Use @Observable |
| Completion handlers | Use async/await |
Missing #Preview | Add preview for every View |
| Non-Sendable in async | Use struct with let |
Flat Sources/ structure | Use Features/[Feature]/ |