SwiftUI Patterns
Modern SwiftUI patterns for building declarative, performant user interfaces on Apple platforms. Covers the Observation framework, view composition, type-safe navigation, and performance optimization.
When to Activate
- Building SwiftUI views and managing state (
@State,@Observable,@Binding) - Designing navigation flows with
NavigationStack - Structuring view models and data flow
- Optimizing rendering performance for lists and complex layouts
- Working with environment values and dependency injection in SwiftUI
State Management
Property Wrapper Selection
Choose the simplest wrapper that fits:
| Wrapper | Use Case |
|---|---|
@State | View-local value types (toggles, form fields, sheet presentation) |
@Binding | Two-way reference to parent's @State |
@Observable class + @State | Owned model with multiple properties |
@Observable class (no wrapper) | Read-only reference passed from parent |
@Bindable | Two-way binding to an @Observable property |
@Environment | Shared dependencies injected via .environment() |
@Observable ViewModel
Use @Observable (not ObservableObject) — it tracks pr…