Offering media for sale in your app

At a glance

Project structure

Source bundle/
├── Objective-C/
│   └── StoreProductViewController/
│       ├── main.m
│       ├── TableViewController.m
│       ├── AppDelegate.h
│       ├── TableViewController.h
│       ├── AppDelegate.m
│       ├── Product.h
│       ├── NSString+Additions.h
│       ├── NSString+Additions.m
│       └── Product.m
└── Swift/
    └── StoreProductViewController/
        ├── AppDelegate.swift
        ├── TableViewController.swift
        └── Product.swift

Structure observations

• Architecturally prominent files are ranked from entry points and role-named declarations; resource-only paths are omitted.
• Primary languages: C/Objective-C header, Objective-C, Swift.
• The verified tree contains 13 project/configuration file(s) and 7 source declaration(s).

Overall architecture

flowchart LR
    Bundle["Sample bundle"]
    V1["Objective-C"]
    V2["Swift"]
    Boundary["StoreKit APIs"]
    Bundle --> V1
    V1 --> Boundary
    Bundle --> V2
    V2 --> Boundary

Reference code

Objective-C/StoreProductViewController/main.m:11 — architecture anchor

int main(int argc, char * argv[]) {
    @autoreleasepool {
        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
    }
}

Interpretation

The branches represent separate entry-bearing project variants in the downloaded bundle, not runtime calls between those variants. Each branch is intentionally collapsed at the documented framework boundary; the detailed target-local flow remains in the cited files. Ownership is claimed only where the next section cites a stored property or assignment.

Ownership and state

classDiagram
    TableViewController o-- NSMutableArray : products
    AppDelegate o-- UIWindow : window
    Product *-- String : title
    Product *-- String : productIdentifier

Ownership evidence

Objective-C/StoreProductViewController/TableViewController.m:15 — stored dependency or nearest verified ownership anchor

@interface TableViewController () <SKStoreProductViewControllerDelegate>
@property (strong) NSMutableArray *products;
@end

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.

No source-visible execution, scheduling, or synchronization boundary was found in the indexed source.

@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.

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

Swift/StoreProductViewController/AppDelegate.swift:11 — representative type boundary

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
    var window: UIWindow?
}

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

Access control

Reference code

Objective-C/StoreProductViewController/AppDelegate.h:11 — representative boundary

@interface AppDelegate : UIResponder <UIApplicationDelegate>
@property (strong, nonatomic) UIWindow *window;
@end

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: Controller: TableViewController; Delegate: AppDelegate.
• Protocols: no local protocol declaration in the scanned source.
• Methods: viewDidLoad, tableView, showStoreForProduct, productViewControllerDidFinish, fetchMedia, showStore, application.
• Files: Objective-C/StoreProductViewController/TableViewController.m, Objective-C/StoreProductViewController/AppDelegate.h, Objective-C/StoreProductViewController/TableViewController.h, Swift/StoreProductViewController/AppDelegate.swift, Swift/StoreProductViewController/TableViewController.swift, Swift/StoreProductViewController/Product.swift.

Architecture takeaways

• main is the main source-visible entry or composition anchor for this sample.
• Framework work reaches UIKit, StoreKit 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