Integrating virtual objects with your environment

At a glance

Project structure

Source bundle/
├── TinyTreasureTrove/
│   ├── TinyTreasureTroveApp.swift
│   ├── AppModel.swift
│   ├── Gameplay/
│   │   ├── ThrowableComponent.swift
│   │   ├── GameObjectSystem.swift
│   │   └── GameLogic.swift
│   ├── ECS/
│   │   ├── AnimationCallbackComponent.swift
│   │   ├── ChestComponent.swift
│   │   ├── GameObjectComponent.swift
│   │   └── KeyComponent.swift
│   └── UI/
│       ├── ContentView.swift
│       └── ImmersiveView.swift
└── Packages/
    └── RealityKitContent/
        └── Sources/
            └── RealityKitContent/
                └── RealityKitContent.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 4 project/configuration file(s) and 17 source declaration(s).

Overall architecture

flowchart LR
    N1["TinyTreasureTroveApp"]
    N2["ContentView"]
    N3["AppModel"]
    N4["GameObjectSystem"]
    N5["RealityKit APIs"]
    N1 --> N2
    N2 --> N3
    N3 --> N4
    N4 --> N5

Reference code

TinyTreasureTrove/TinyTreasureTroveApp.swift:10 — architecture anchor

@main
struct TinyTreasureTroveApp: App {
    @State private var appModel = AppModel()

    var body: some Scene {
        WindowGroup {
            ContentView()
                .environment(appModel)
        }
        .windowStyle(.volumetric)

        ImmersiveSpace(id: appModel.immersiveSpaceID) {
            ImmersiveView()
                .environment(appModel)
                .onAppear {
                    appModel.immersiveSpaceState = .open
                }
                .onDisappear {
                    appModel.immersiveSpaceState = .closed
                }
        }
        .immersionStyle(selection: .constant(.mixed), in: .mixed)
    }
}

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 RealityKit.

Ownership and state

classDiagram
    TinyTreasureTroveApp *-- AppModel : appModel
    PositionTimeStamp *-- SIMD3 : position
    PositionTimeStamp o-- CFTimeInterval : timestamp
    ThrowableComponent *-- Float : throwThreshold

Ownership evidence

TinyTreasureTrove/TinyTreasureTroveApp.swift:12 — stored dependency or nearest verified ownership anchor

@main
struct TinyTreasureTroveApp: App {
    @State private var appModel = AppModel()
    // ...
}

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

TinyTreasureTrove/AppModel.swift:10 — representative execution boundary

@MainActor
@Observable
class AppModel {
    // ...
        case closed
    // ...
}

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

TinyTreasureTrove/TinyTreasureTroveApp.swift:11 — representative type boundary

@main
struct TinyTreasureTroveApp: App {
    @State private var appModel = AppModel()
    // ...
}

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

Access control

Reference code

Packages/RealityKitContent/Sources/RealityKitContent/RealityKitContent.swift:10 — representative boundary

public let realityKitContentBundle = Bundle.module

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: TinyTreasureTroveApp; Component: AnimationCallbackComponent, ChestComponent, GameObjectComponent, KeyComponent, ThrowableComponent; Model: AppModel; System: GameObjectSystem; View: ContentView, ImmersiveView.
• Protocols: no local protocol declaration in the scanned source.
• Methods: updatePositionHistory, calculateThrowVelocity, shouldThrow, clearHistory, makeThrowable, addCallback, handleEvent, playAnimation.
• Files: TinyTreasureTrove/TinyTreasureTroveApp.swift, TinyTreasureTrove/AppModel.swift, TinyTreasureTrove/Gameplay/ThrowableComponent.swift, TinyTreasureTrove/ECS/AnimationCallbackComponent.swift, TinyTreasureTrove/ECS/ChestComponent.swift, TinyTreasureTrove/ECS/GameObjectComponent.swift.

Architecture takeaways

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