Swift Splash

At a glance

Project structure

Source bundle/
├── SwiftSplash/
│   ├── SwiftSplashApp.swift
│   ├── Views/
│   │   ├── PieceShelfView.swift
│   │   ├── TrackBuildingView.swift
│   │   ├── ContentView.swift
│   │   ├── EditTrackPieceView.swift
│   │   ├── PieceShelfTrackButtonsView.swift
│   │   └── PlaceStartPieceView.swift
│   └── Data & State/
│       └── AppState.swift
└── Packages/
    └── SwiftSplashTrackPieces/
        └── Sources/
            └── SwiftSplashTrackPieces/
                ├── Components/
                │   ├── MarkerComponents.swift
                │   ├── ConnectableStateComponent.swift
                │   └── CustomBillboardComponent.swift
                └── Systems/
                    └── CustomBillboardSystem.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 39 source declaration(s).

Overall architecture

flowchart LR
    N1["SwiftSplashApp"]
    N2["ContentView"]
    N3["SoundEffectPlayer"]
    N4["RealityKit / SwiftSplashTrackPieces APIs"]
    N1 --> N2
    N2 --> N3
    N3 --> N4

Reference code

SwiftSplash/SwiftSplashApp.swift:12 — architecture anchor

@main
@MainActor
struct SwiftSplash: App {
    @Environment(\.openImmersiveSpace) private var openImmersiveSpace
    // ...
}

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 visionOS.

Ownership and state

classDiagram
    SwiftSplash *-- AppState : appState
    SwiftSplash *-- ImmersionStyle : immersionStyle
    RideAnimationComponent *-- Double : timecodeWhenNotPlaying
    RideWaterComponent *-- Float : fillLevel

Ownership evidence

SwiftSplash/SwiftSplashApp.swift:19 — stored dependency or nearest verified ownership anchor

@main
@MainActor
struct SwiftSplash: App {
    // ...
    @State private var appState = AppState()
    // ...
}

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

Packages/SwiftSplashTrackPieces/Sources/SwiftSplashTrackPieces/Components/Connectable.swift:13 — representative execution boundary

@MainActor
public struct ConnectableComponent: Component, Codable {
    public init() {}
}

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

Packages/SwiftSplashTrackPieces/Sources/SwiftSplashTrackPieces/Components/MarkerComponents.swift:13 — representative type boundary

public struct PlaceStartPieceUIMarkerComponent: Component, Codable {
}

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

Access control

Reference code

Packages/SwiftSplashTrackPieces/Sources/SwiftSplashTrackPieces/Components/Connectable.swift:15 — representative boundary

    public init() {}

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: Component: ConnectableComponent, ConnectableStateComponent, CustomBillboardComponent, EditUILocationMarkerComponent, GlowComponent; Player: SoundEffectPlayer; System: CustomBillboardSystem; View: ContentView, EditTrackPieceView, PieceShelfTrackButtonsView, PieceShelfView, PlaceStartPieceView.
• Protocols: no local protocol declaration in the scanned source.
• Methods: setUpSession, update, setAnimateIn, makeBody.
• Files: Packages/SwiftSplashTrackPieces/Sources/SwiftSplashTrackPieces/Components/ConnectableStateComponent.swift, Packages/SwiftSplashTrackPieces/Sources/SwiftSplashTrackPieces/Components/CustomBillboardComponent.swift, Packages/SwiftSplashTrackPieces/Sources/SwiftSplashTrackPieces/Systems/CustomBillboardSystem.swift, SwiftSplash/Views/PieceShelfView.swift, SwiftSplash/Views/TrackBuildingView.swift, SwiftSplash/Data & State/AppState.swift.

Architecture takeaways

• SwiftSplashApp is the main source-visible entry or composition anchor for this sample.
• Framework work reaches RealityKit, SwiftSplashTrackPieces, SwiftUI, ARKit 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