SwiftUI Excellence Playbook
Tactical guide for designing and building world-class SwiftUI interfaces—the kind that feel at home next to Apple's own apps.
Six Non-Negotiables
- Content first — UI is a frame, not the painting
- System components unless measured reason not to — buy accessibility, platform behavior, design updates for free
- Design for states, not screens — every screen handles: loading, empty, error, offline, partial, permission denied
- Accessibility is a constraint — Dynamic Type, VoiceOver, Reduce Motion/Transparency, Increased Contrast
- Performance is a feature — "feels instant" interactions, instrument when hitches occur
- Coherence over cleverness — best interfaces feel inevitable
Quick Reference: ADA Rubric
| Category | Requirement |
|---|---|
| Delight | Micro-delight at success moments only, never reduces clarity |
| Innovation | In discovery, state communication, simplifying complexity |
| Interaction | Predictable, direct, forgiving, platform-appropriate |
| Inclusivity | Dynamic Type XXL+, VoiceOver, no color-only meaning, reduced motion |
| Visuals | Consistent rhythm, coherent materials, restrained tint |
Design Workflow (Step-by-Step)
- Define experience — 10-line spec: goal, primary action, states, edge cases, platforms
- Sketch IA — TabView vs NavigationSplitView vs deep navigation
- Design hierarchy — one hero, one primary CTA per moment, progressive disclosure
- Build tokens first — spacing, radius, typography, motion, colors
- Build components — cards, rows, buttons, empty states, filters
- Integrate structure — NavigationStack, NavigationSplitView, TabView, Sheets
- Add motion — only what improves comprehension and causality
- Accessibility + performance pass — Dynamic Type, VoiceOver, Instruments
Liquid Glass Quick Rules (iOS 26+)
Do:
- Use glass for navigation/control layer floating above content
- Group nearby glass in
GlassEffectContainer - Use
glassEffect(.interactive)for custom controls - Use
glassEffectIDfor morphing transitions
Don't:
- Glass on content layer (tables, documents)
- Glass on glass stacking
- Tint everything — only primary actions/meaning
- Custom backgrounds behind toolbars (let system handle scroll edge effects)
Layout Essentials
| Container | Use For |
|---|---|
List | Large datasets, selection, swipe actions, edit mode |
ScrollView + LazyVStack | Custom surfaces, cards, mixed content |
Grid | Forms, settings, dense structured layouts |
LazyVGrid | Responsive galleries |
NavigationSplitView | iPad/Mac hierarchical apps |
NavigationStack | Deep navigation flows |
Animation Principles
- Motion communicates causality, hierarchy, continuity
- State-driven animation, not imperative choreography
- Springs for organic UI, ease-in/out for fades
- Custom transitions for signature moments only
- Always provide Reduce Motion fallback
Performance Rules
| Rule | Implementation |
|---|---|
| Body must be cheap | No sorting, filtering, formatting, I/O in body |
| Stable identity | ForEach(items, id: \.id) not \.self, no UUID() in body |
| Dependency hygiene | Keep @State local, pass Binding not whole model |
| Instrument | Use SwiftUI instrument (Instruments 26) for hitches |
Accessibility Checklist
- System text styles, no clipping at XXL+
- Layout adapts (stacks turn vertical, rows multi-line)
- VoiceOver labels/hints on non-obvious controls
- Focus order matches reading order
- 44×44pt minimum touch targets
- Reduced Motion removes parallax, uses opacity
- Reduced Transparency increases separation
Component Primitives (Build These)
- Screen scaffold
- Section header
- Card surface
- List row
- Primary/secondary/icon buttons
- Empty state
- Loading skeleton
- Error banner
- Form field row
- Chip/tag/pill
Full Reference
For complete implementation patterns, code recipes, design tokens, Liquid Glass details, and the full ADA review checklist:
See: swiftui-playbook.md