Recognizing tables within a document

At a glance

Project structure

Source bundle/
├── DocumentReaderApp.swift
├── DataModel.swift
├── Camera/
│   ├── CameraPreview.swift
│   ├── CaptureService.swift
│   ├── PhotoCapture.swift
│   └── Camera.swift
├── Views/
│   ├── CameraView.swift
│   ├── ImageView.swift
│   ├── ContactView.swift
│   └── ContentView.swift
├── VisionModel.swift
└── BoundingBox.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 3 project/configuration file(s) and 26 source declaration(s).

Overall architecture

flowchart LR
    N1["DocumentReaderApp"]
    N2["ContentView"]
    N3["VisionModel"]
    N4["CaptureService"]
    N5["Vision APIs"]
    N1 --> N2
    N2 --> N3
    N3 --> N4
    N4 --> N5

Reference code

DocumentReaderApp.swift:10 — architecture anchor

@main
struct DocumentReaderApp: 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 Vision.

Ownership and state

classDiagram
    Contact *-- String : name
    Contact *-- String : email
    Contact *-- String : phoneNumber
    TableCell o-- Content : content

Ownership evidence

DataModel.swift:13 — stored dependency or nearest verified ownership anchor

struct Contact {
    let name: String
    let email: String
    let phoneNumber: String?
}

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.

@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.

Reference code

Camera/Camera.swift:39 — representative execution boundary

    func start() async {
        // ...
            status = .unauthorized
        // ...
    }

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

Camera/CameraPreview.swift:78 — representative type boundary

protocol PreviewSource: Sendable {
    // Connects a preview destination to this source.
    func connect(to target: PreviewTarget)
}

The source explicitly defines local protocol relationships: PreviewView → PreviewTarget, DefaultPreviewSource → PreviewSource.

Access control

Reference code

Camera/Camera.swift:29 — representative boundary

@Observable
final class Camera {
    // ...
    private(set) var status = CameraStatus.unknown
    // ...
}

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: DocumentReaderApp; Delegate: PhotoCaptureDelegate; Model: VisionModel; Service: CaptureService; View: CameraView, ContactView, ContentView, ImageView, PreviewView.
• Protocols: PreviewSource, PreviewTarget.
• Methods: makeUIView, updateUIView, setSession, connect, start, setUpSession, addInput, addOutput.
• Files: DocumentReaderApp.swift, Camera/CameraPreview.swift, Camera/CaptureService.swift, Views/CameraView.swift, Views/ImageView.swift, VisionModel.swift.

Architecture takeaways

• DocumentReaderApp is the main source-visible entry or composition anchor for this sample.
• Framework work reaches SwiftUI, Vision, AVFoundation, AVKit 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.
• Local protocol relationships provide an explicit substitution boundary.

Source map

• Official Apple documentation