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ios-animations

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Clinic-architecture-aligned iOS animation craft guidelines for SwiftUI (iOS 26 / Swift 6.2) covering motion tokens, spring physics, gesture continuity, spatial transitions, micro-interactions, and accessibility. Enforces @Equatable on animated views and keeps animation state aligned with Domain/Data feature boundaries. Use when writing, reviewing, or refactoring SwiftUI animation code under the clinic modular MVVM-C architecture.

skills/.experimental/ios-animations/SKILL.md

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# dot-skills — Airbnb iOS SwiftUI Animations Best Practices

Opinionated, strict animation craft guide for SwiftUI iOS 26 / Swift 6.2 apps. Contains 50 rules across 8 categories, prioritized by impact. Derived from Airbnb Engineering motion patterns, Apple WWDC sessions, and Apple Human Interface Guidelines. Mandates @Equatable on every animated view, motion tokens for all spring/timing values, and design system tokens for layout.

## Mandated Architecture Alignment

This skill is designed to work alongside `swift-ui-architect` and `ios-design-system`. All code examples follow the same non-negotiable constraints:

- `@Equatable` macro on every view (Airbnb measured 15% scroll hitch reduction)
- `@Observable` for complex animation state that involves business logic triggers
- `@State` for view-owned animation state (toggle booleans, drag offsets)
- Design system tokens: `Spacing.xs/sm/md/lg`, `Radius.sm/md/lg` — zero hardcoded layout numbers
- Motion tokens: `Motion.standard/responsive/playful` — zero scattered spring literals
- Semantic colors: `.backgroundSurface`, `.accentPrimary` — no raw Color literals in views
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