swiftui-view-refactor

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SwiftUI View Refactor

View Ordering (top to bottom)

1. Environment properties
2. private/public let constants
3. @State / other stored properties
4. Computed var (non-view)
5. init
6. body
7. Computed view builders / view helpers
8. Helper / async functions

Core Guidelines

1) Prefer MV (Model-View) Patterns

• Default to MV: views are lightweight state expressions; models/services own business logic
• Favor @State, @Environment, @Query, task, and onChange for orchestration
• Inject services and shared models via @Environment
• Split large views into smaller views instead of introducing a view model

2) Split Large Bodies

If body grows beyond a screen or has multiple logical sections, split it within this file:

var body: some View {
    VStack(alignment: .leading, spacing: 16) {
        HeaderSection(title: title, isPinned: isPinned)
        DetailsSection(details: details)
        ActionsSection(onSave: onSave, onCancel: onCancel)
    }
}

Or use computed view properties in the same file:

var body: some View {
    List {
        header
        filters
        results
        footer
    }
}

private var header: some View {
    VStack(alignment: .leading, spacing: 6) {
        Text(title).font(.title2)
        Text(subtitle).font(.subheadline)
    }
}

private var filters: some View {
    ScrollView(.horizontal, showsIndicators: false) {
        HStack {
            ForEach(filterOptions, id: \.self) { option in
                FilterChip(option: option, isSelected: option == selectedFilter)
                    .onTapGesture { selectedFilter = option }
            }
        }
    }
}

3) View Model Handling (only if already present)

• Do not introduce a view model unless the request or existing code clearly calls for one
• If a view model exists, make it non-optional when possible
• Pass dependencies to the view via init, then into the view model

@State private var viewModel: SomeViewModel

init(dependency: Dependency) {
    _viewModel = State(initialValue: SomeViewModel(dependency: dependency))
}

4) Observation Usage

• For @Observable reference types, store them as @State in the root view
• Pass observables down explicitly as needed
• Avoid optional state unless required

Refactor Workflow

1. Reorder the view to match the ordering rules
2. Favor MV: move orchestration into the view using @State, @Environment, task, onChange
3. If a view model exists, replace optional with non-optional @State initialized in init
4. Confirm Observation usage: @State for root @Observable, no redundant wrappers
5. Keep behavior intact: do not change layout or business logic unless requested

Large-View Handling

When a SwiftUI view file exceeds ~300 lines:

1. Split using extensions to group related helpers
2. Move async functions into dedicated private extensions
3. Use // MARK: - comments (e.g., // MARK: - Actions, // MARK: - Subviews)
4. Keep main struct focused on stored properties, init, and body

struct LargeView: View {
    @Environment(Store.self) private var store
    @State private var items: [Item] = []

    var body: some View {
        List {
            content
        }
        .task { await loadItems() }
    }
}

// MARK: - Subviews
private extension LargeView {
    var content: some View {
        ForEach(items) { item in
            ItemRow(item: item)
        }
    }
}

// MARK: - Actions
private extension LargeView {
    func loadItems() async {
        items = await store.fetchItems()
    }
}

Keep extracted sections in this file. Once a section needs its own @ViewBuilder API, container/composition logic, or reuse across files, move it out and hand off to the swiftui-expert-skill skill.

Checklist

• Properties ordered correctly (Environment → let → @State → computed → init → body)
• Large body split into subviews or computed view properties
• No unnecessary ViewModels introduced
• Existing ViewModels are non-optional where possible
• @Observable types stored as @State in root view
• Dependencies injected via @Environment
• File organized with MARK comments if >300 lines
• Behavior unchanged unless explicitly requested