SwiftUI UI Patterns

Quick start

Choose a track based on your goal:

Existing project

• Identify the feature or screen and the primary interaction model (list, detail, editor, settings, tabbed).
• Find a nearby example in the repo with

  rg "TabView\("

  or similar, then read the closest SwiftUI view.
• Apply local conventions: prefer SwiftUI-native state, keep state local when possible, and use environment injection for shared dependencies.
• Choose the relevant component reference from

  references/components-index.md

  and follow its guidance.
• Build the view with small, focused subviews and SwiftUI-native data flow.

New project scaffolding

• Start with

  references/app-scaffolding-wiring.md

  to wire TabView + NavigationStack + sheets.
• Add a minimal

  AppTab

  and

  RouterPath

  based on the provided skeletons.
• Choose the next component reference based on the UI you need first (TabView, NavigationStack, Sheets).
• Expand the route and sheet enums as new screens are added.

General rules to follow

• Use modern SwiftUI state (

  @State

  ,

  @Binding

  ,

  @Observable

  ,

  @Environment

  ) and avoid unnecessary view models.
• Prefer composition; keep views small and focused.
• Use async/await with

  .task

  and explicit loading/error states.
• Maintain existing legacy patterns only when editing legacy files.
• Follow the project's formatter and style guide.
• Sheets: Prefer

  .sheet(item:)

  over

  .sheet(isPresented:)

  when state represents a selected model. Avoid

  if let

  inside a sheet body. Sheets should own their actions and call

  dismiss()

  internally instead of forwarding

  onCancel

  /

  onConfirm

  closures.

Workflow for a new SwiftUI view

1. Define the view's state and its ownership location.
2. Identify dependencies to inject via

   @Environment

   .
3. Sketch the view hierarchy and extract repeated parts into subviews.
4. Implement async loading with

   .task

   and explicit state enum if needed.
5. Add accessibility labels or identifiers when the UI is interactive.
6. Validate with a build and update usage callsites if needed.

Component references

Use

references/components-index.md

as the entry point. Each component reference should include:

• Intent and best-fit scenarios.
• Minimal usage pattern with local conventions.
• Pitfalls and performance notes.
• Paths to existing examples in the current repo.

Sheet patterns

Item-driven sheet (preferred)

@State private var selectedItem: Item?

.sheet(item: $selectedItem) { item in
    EditItemSheet(item: item)
}

Sheet owns its actions

struct EditItemSheet: View {
    @Environment(\.dismiss) private var dismiss
    @Environment(Store.self) private var store

    let item: Item
    @State private var isSaving = false

    var body: some View {
        VStack {
            Button(isSaving ? "Saving…" : "Save") {
                Task { await save() }
            }
        }
    }

    private func save() async {
        isSaving = true
        await store.save(item)
        dismiss()
    }
}

Adding a new component reference

• Create

  references/<component>.md

  .
• Keep it short and actionable; link to concrete files in the current repo.
• Update

  references/components-index.md

  with the new entry.