Sample CodevisionOSReviewed 2026-07-21View on Apple Developer

Building a guessing game for visionOS

At a glance

Item Summary
Purpose Create a team-based guessing game for visionOS using Group Activities.
App architecture A Swift sample with the source-visible chain GuessTogetherAppSessionControllerPhraseManagerGroupActivities APIs.
Main patterns View-controller organization, Central store, Actor-isolated state
Project style 25 scanned source file(s) across Swift, organized around ranked entry, type, and file boundaries.

Project structure

Source bundle/
└── GuessTogether/
    ├── GuessTogetherApp.swift
    ├── Models/
    │   ├── GameModel.swift
    │   ├── PlayerModel.swift
    │   └── AppModel.swift
    ├── ImmersiveSpace/
    │   ├── PhraseDeckView.swift
    │   ├── PhraseDeckPodiumView.swift
    │   └── SeatScoresView.swift
    ├── Utilities/
    │   └── PhraseManager.swift
    ├── WindowViews/
    │   ├── GameScoreBoardView.swift
    │   ├── TeamSelectionView.swift
    │   └── WelcomeView.swift
    └── GroupActivity/
        └── SessionController.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 37 source declaration(s).

Overall architecture

Reference code

GuessTogether/GuessTogetherApp.swift:10 — architecture anchor

@main
struct GuessTogetherApp: App {
    // ...
}

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 Group Activities.

Ownership and state

Ownership evidence

GuessTogether/GuessTogetherApp.swift:12 — stored dependency or nearest verified ownership anchor

    @State var appModel = AppModel()
Owner Object or state Relationship Mutation authority
GuessTogetherApp AppModel (appModel) owns wrapper-managed state App/module collaborators
GameModel ActivityStage (stage) stores or receives App/module collaborators
GameModel Excludedcategories (excludedCategories) stores or receives App/module collaborators
GameModel Array (turnHistory) owns value state App/module collaborators

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

GuessTogether/GuessTogetherApp.swift:11 — representative type boundary

struct GuessTogetherApp: App {
    // ...
}
Type Responsibility Depends on or conforms to
GuessTogetherApp Application entry and top-level composition App
GameModel Feature data or observable state Codable, Hashable, Sendable
PhraseDeckView User-interface presentation and input forwarding View
PhraseCardView User-interface presentation and input forwarding View
PlayerModel Feature data or observable state Codable, Hashable, Sendable, Identifiable
AppModel Feature data or observable state Concrete collaborators/imported frameworks
PhraseManager Long-lived feature or framework coordination Sendable
ScoreBoardView User-interface presentation and input forwarding View
TeamStatusView User-interface presentation and input forwarding View
TeamSelectionView User-interface presentation and input forwarding View

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

Access control

Symbol Access Verified effect Likely rationale
observeRemoteGameModelUpdates (GuessTogether/GroupActivity/SessionController+RemoteParticipantSynchronization.swift:46) private Use is restricted to the lexical declaration and same-file extensions allowed by Swift. Inference: hide an implementation step that is not part of the collaboration surface.
observeRemotePlayerModelUpdates (GuessTogether/GroupActivity/SessionController+RemoteParticipantSynchronization.swift:76) private Use is restricted to the lexical declaration and same-file extensions allowed by Swift. Inference: hide an implementation step that is not part of the collaboration surface.
observeActiveRemoteParticipants (GuessTogether/GroupActivity/SessionController+RemoteParticipantSynchronization.swift:84) private Use is restricted to the lexical declaration and same-file extensions allowed by Swift. Inference: hide an implementation step that is not part of the collaboration surface.
phrases (GuessTogether/Utilities/PhraseManager.swift:12) private Use is restricted to the lexical declaration and same-file extensions allowed by Swift. Inference: keep state mutation or dependency lifetime inside the owning implementation.

Reference code

GuessTogether/GroupActivity/SessionController+RemoteParticipantSynchronization.swift:46 — representative boundary

    private func observeRemoteGameModelUpdates() {
        // ...
    }

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

Logic Owning type or file Placement rationale
Application entry and top-level composition GuessTogetherApp The source’s App suffix makes this role explicit.
View lifecycle, callbacks, and feature coordination SessionController The source’s Controller suffix makes this role explicit.
Long-lived feature or framework coordination PhraseManager The source’s Manager suffix makes this role explicit.
Feature data or observable state AppModel, GameModel, PlayerModel The source’s Model suffix makes this role explicit.
Centralized state or persistence access GameSyncStore The source’s Store suffix makes this role explicit.
User-interface presentation and input forwarding ActivitySharingView, CategorySelectionView, MainView, PhraseCardView The source’s View suffix makes this role explicit.

Design patterns

Pattern Source evidence Purpose or tradeoff
View-controller organization GuessTogether/GroupActivity/SessionController.swift:12 A controller is the verified coordination boundary; this is MVC-style only where a separate model is present.
Central store GuessTogether/GroupActivity/SessionController+RemoteParticipantSynchronization.swift:130 A store-named type centralizes feature state or persistence.
Actor-isolated state GuessTogether/GroupActivity/SessionController.swift:11 Actor annotations make the concurrency ownership boundary explicit.

Naming conventions

  • Types: App: GuessTogetherApp; Controller: SessionController; Manager: PhraseManager; Model: AppModel, GameModel, PlayerModel; Store: GameSyncStore; View: ActivitySharingView, CategorySelectionView, MainView, PhraseCardView, PhraseDeckPodiumView.
  • Protocols: no local protocol declaration in the scanned source.
  • Methods: randomPhrase, teamHasPlayers, playersOnTeam.
  • Files: GuessTogether/GuessTogetherApp.swift, GuessTogether/Models/GameModel.swift, GuessTogether/ImmersiveSpace/PhraseDeckView.swift, GuessTogether/Models/PlayerModel.swift, GuessTogether/Models/AppModel.swift, GuessTogether/Utilities/PhraseManager.swift.

Architecture takeaways

  • GuessTogetherApp is the main source-visible entry or composition anchor for this sample.
  • Framework work reaches SwiftUI, GroupActivities, Spatial, CoreTransferable 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

Source file Relevant symbols
GuessTogether/GuessTogetherApp.swift GuessTogetherApp
GuessTogether/Models/GameModel.swift GameModel, GameStage, ActivityStage
GuessTogether/ImmersiveSpace/PhraseDeckView.swift PhraseDeckView, PhraseDeckButton, Kind, PhraseCardView
GuessTogether/Models/PlayerModel.swift PlayerModel, Team
GuessTogether/Models/AppModel.swift AppModel
GuessTogether/Utilities/PhraseManager.swift PhraseManager, Phrase
GuessTogether/WindowViews/GameScoreBoardView.swift ScoreBoardView, TeamStatusView
GuessTogether/WindowViews/TeamSelectionView.swift TeamSelectionView, TeamList
GuessTogether/WindowViews/WelcomeView.swift WelcomeView, WelcomeBanner
GuessTogether/GroupActivity/SessionController.swift SessionController