Apple Sample Code Architecture

Explore how Apple’s sample projects actually organize applications, state, framework boundaries, protocols, files, and execution. This independent study turns verified Apple sample-code sources into concise, source-cited architecture notes without presenting one preferred app architecture.

Inside one sample analysis

Building a Custom Catalog and Matching Audio

This ShazamKit sample provides a compact preview of the ownership, state flow, framework boundary, naming, and access-control details available on its full analysis page.

Architecture and ownership

flowchart LR
    App["FoodMathApp"] -->|"renders"| View["ContentView"]
    App -->|"owns @StateObject<br/>and injects"| Matcher["Matcher"]
    View -->|"requests"| Provider["CatalogProvider"]
    Provider -->|"builds"| Catalog["SHCustomCatalog"]
    View -->|"passes catalog"| Matcher
    Matcher -->|"publishes result"| View

What the analysis surfaces

Ownership: FoodMathApp creates a private @StateObject and injects it into ContentView; this is a lifecycle and composition boundary.
State flow: ContentView receives Matcher through the SwiftUI environment, while Matcher publishes the match result.
Framework boundary: CatalogProvider constructs SHCustomCatalog; ContentView passes the catalog into Matcher.

Reference code

Shared Source/App/FoodMathApp.swift:10

@main
struct FoodMathApp: App {
    @StateObject private var matcher = Matcher()

    var body: some Scene {
        WindowGroup {
            ContentView()
                .environmentObject(matcher)
        }
    }
}

Open the full ShazamKit analysis Explore all samples

Start with a developer question

Who owns and mutates state? Follow construction, storage, observation, delegation, and lifetime instead of relying on type names.
Where does work execute? Inspect actor isolation, main-actor handoffs, queues, tasks, run loops, synchronization, and cancellation from source.
What does Apple call each responsibility? Compare real uses of ViewModel, Controller, Manager, Store, Coordinator, and related suffixes.
How is the project divided? Review targets, packages, feature or role folders, protocols, imports, and framework adapters.

Continue the study

Patterns across Apple sample code summarizes only classifications found in the reviewed sources. Frameworks and categories provides the complete catalog entry point. About this study documents the evidence method, workspace, publication boundary, and licenses.

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