Bringing advanced speech-to-text capabilities to your app

At a glance

Project structure

Source bundle/
├── SwiftTranscriptionSampleApp/
│   ├── Helpers/
│   │   ├── SwiftTranscriptionSampleAppApp.swift
│   │   ├── Helpers.swift
│   │   └── BufferConversion.swift
│   ├── Models/
│   │   └── StoryModel.swift
│   ├── Recording and Transcription/
│   │   ├── Recorder.swift
│   │   └── Transcription.swift
│   └── Views/
│       ├── ContentView.swift
│       └── TranscriptView.swift
├── Configuration/
│   └── SampleCode.xcconfig
└── SwiftTranscriptionSampleApp.xcodeproj/
    ├── .xcodesamplecode.plist
    └── project.pbxproj

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 13 source declaration(s).

Overall architecture

flowchart LR
    N1["SwiftTranscriptionSampleAppApp"]
    N2["ContentView"]
    N3["BufferConverter"]
    N4["Speech APIs"]
    N1 --> N2
    N2 --> N3
    N3 --> N4

Reference code

SwiftTranscriptionSampleApp/Helpers/SwiftTranscriptionSampleAppApp.swift:11 — architecture anchor

@main
struct SwiftTranscriptionSampleApp: 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 Speech.

Ownership and state

classDiagram
    Story *-- UUID : id
    Story *-- String : title
    Story o-- AttributedString : text
    Story *-- URL : url

Ownership evidence

SwiftTranscriptionSampleApp/Models/StoryModel.swift:16 — stored dependency or nearest verified ownership anchor

@Observable
class Story: Identifiable {
    // ...
    let id: UUID
    // ...
}

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.

Class and protocol design

SwiftTranscriptionSampleApp/Helpers/SwiftTranscriptionSampleAppApp.swift:12 — representative type boundary

struct SwiftTranscriptionSampleApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

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

Access control

Reference code

SwiftTranscriptionSampleApp/Helpers/BufferConversion.swift:18 — representative boundary

class BufferConverter {
    // ...
    private var converter: AVAudioConverter?
    // ...
}

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: SwiftTranscriptionSampleApp; Converter: BufferConverter; Recorder: Recorder; View: ContentView, TranscriptView.
• Protocols: no local protocol declaration in the scanned source.
• Methods: suggestedTitle, blank, storyBrokenUpByLines, hash, isAuthorized, writeBufferToDisk, handlePlayback, handleRecordingButtonTap.
• Files: SwiftTranscriptionSampleApp/Recording and Transcription/Recorder.swift, SwiftTranscriptionSampleApp/Views/ContentView.swift, SwiftTranscriptionSampleApp/Views/TranscriptView.swift.

Architecture takeaways

• SwiftTranscriptionSampleAppApp is the main source-visible entry or composition anchor for this sample.
• Framework work reaches SwiftUI, AVFoundation, Speech, SwiftData 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