Building a Localized Food-Ordering App

At a glance

Project structure

Source bundle/
└── Caffe/
    ├── Caffe/
    │   ├── CaffeApp.swift
    │   ├── Views/
    │   │   ├── FoodSizeView.swift
    │   │   ├── ContentView.swift
    │   │   ├── FoodDetailsView.swift
    │   │   ├── FoodHeaderView.swift
    │   │   ├── RainbowText.swift
    │   │   └── ReceiptView.swift
    │   └── Models/
    │       ├── Food.swift
    │       └── Order.swift
    └── CaffeCompanion WatchKit Extension/
        ├── CaffeWatchApp.swift
        ├── ContentView.swift
        └── ComplicationController.swift

Structure observations

• Architecturally prominent files are ranked from entry points and role-named declarations; resource-only paths are omitted.
• Primary languages: Swift.
• The verified tree contains 5 project/configuration file(s) and 22 source declaration(s).

Overall architecture

flowchart LR
    N1["CaffeApp"]
    N2["ContentView"]
    N3["SwiftUI / ClockKit APIs"]
    N1 --> N2
    N2 --> N3

Reference code

Caffe/Caffe/CaffeApp.swift:10 — architecture anchor

@main
struct CaffeApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

Interpretation

The arrows summarize the source-visible entry, role-named types or folders, and framework direction; when nodes come from structural folders, the sequence is a high-level interpretation rather than proof that every adjacent node calls the next. Ownership is claimed only where the next section cites a stored property or assignment. The diagram is intentionally limited to the dominant path into Foundation.

Ownership and state

classDiagram
    FoodSizeLabel o-- FoodItem : food
    FoodSizeLabel o-- FoodSize : size
    Icon *-- String : id
    Icon o-- Image : image

Ownership evidence

Caffe/Caffe/Views/FoodSizeView.swift:11 — stored dependency or nearest verified ownership anchor

struct FoodSizeLabel: View {
    var food: FoodItem
    // ...
}

Composition arrows indicate a source-visible construction expression or locally owned value state; aggregation means the owner stores or receives a dependency without proving exclusive lifetime ownership.

Concurrency, scheduling, and thread safety

Evidence limit: actor isolation, async/await, or Task creation does not by itself prove background-thread execution; Sendable conformance alone does not prove thread-safe mutation.

No source-visible execution, scheduling, or synchronization boundary was found in the indexed source.

@MainActor/MainActor.run, DispatchQueue.main, and RunLoop.main are reported as distinct isolation, queue, and event-loop mechanisms. A plain Task is kept separate from Task.detached; neither is labeled as a background thread.

State propagation, frameworks, and dependencies

Evidence limit: an import proves a source-level compilation dependency at the cited line; it does not prove runtime use, architectural adoption, or whether a Swift package is a direct application dependency.

receive(on:) describes downstream delivery scheduling, while subscribe(on:) describes upstream subscription/request/cancel scheduling. An import Combine alone establishes neither behavior nor a Store, reducer, Redux, or other application architecture.

Class and protocol design

Caffe/Caffe/CaffeApp.swift:11 — representative type boundary

@main
struct CaffeApp: App {
    // ...
            ContentView()
    // ...
}

No local protocol conformance is claimed as protocol-oriented design; external framework conformances are listed only as dependencies.

Access control

Reference code

Caffe/Caffe/Views/ContentView.swift:11 — representative boundary

struct ContentView: View {
    @State private var order: Order = Order()
    // ...
}

Swift declarations without a modifier are internal; explicit private, fileprivate, private(set), public, or open entries above are interpreted by language semantics. Objective-C/C samples instead rely on header and implementation boundaries, which are not equivalent to Swift lexical privacy.

Logic ownership and placement

Design patterns

Naming conventions

• Types: App: CaffeApp, CaffeWatchApp; Controller: ComplicationController; View: ContentView, FoodDetailsView, FoodHeaderView, ReceiptView.
• Protocols: no local protocol declaration in the scanned source.
• Methods: makeBody, hash, localizedPrice, onSelectionComplete, onOrderComplete, orderButtonTapped, isSizeSelected, font.
• Files: Caffe/Caffe/CaffeApp.swift, Caffe/CaffeCompanion WatchKit Extension/CaffeWatchApp.swift, Caffe/Caffe/Views/ContentView.swift, Caffe/Caffe/Views/FoodDetailsView.swift, Caffe/Caffe/Views/FoodHeaderView.swift, Caffe/Caffe/Views/RainbowText.swift.

Architecture takeaways

• CaffeApp is the main source-visible entry or composition anchor for this sample.
• Framework work reaches SwiftUI, ClockKit through a deliberately small high-level chain; the detailed API graph remains inside the cited implementation files.
• Stored-property evidence identifies lifecycle collaboration; it does not by itself prove exclusive object ownership.
• Access-control conclusions separate verified language visibility from the likely design rationale.
• The source does not justify labeling the design protocol-oriented.

Source map

• Official Apple documentation