Sample CodeiOS, iPadOS, Mac CatalystReviewed 2026-07-21View on Apple Developer

Viewing Desktop or Mobile Web Content Using a Web View

At a glance

Item Summary
Purpose Implement a simple iPad web browser that can view either the desktop or mobile version of a website.
App architecture A Swift sample with the source-visible chain AppDelegateViewControllerWebKit APIs.
Main patterns View-controller organization, Delegate or data-source callbacks
Project style 2 scanned source file(s) across Swift, organized around ranked entry, type, and file boundaries.

Project structure

Source bundle/
├── ShinyBrowser/
│   ├── AppDelegate.swift
│   ├── ViewController.swift
│   ├── Base.lproj/
│   │   ├── LaunchScreen.storyboard
│   │   └── Main.storyboard
│   ├── Info.plist
│   └── ShinyBrowser.entitlements
├── Configuration/
│   └── SampleCode.xcconfig
└── ShinyBrowser.xcodeproj/
    ├── .xcodesamplecode.plist
    └── project.pbxproj

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 7 project/configuration file(s) and 2 source declaration(s).

Overall architecture

Reference code

ShinyBrowser/AppDelegate.swift:10 — architecture anchor

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

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 WebKit.

Ownership and state

Ownership evidence

ShinyBrowser/AppDelegate.swift:12 — stored dependency or nearest verified ownership anchor

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
    var window: UIWindow?
}
Owner Object or state Relationship Mutation authority
AppDelegate UIWindow (window) stores or receives App/module collaborators
ViewController UIButton (backButton) holds a non-owning reference The referenced object’s lifecycle is owned elsewhere
ViewController UIButton (forwardButton) holds a non-owning reference The referenced object’s lifecycle is owned elsewhere
ViewController UIView (urlView) holds a non-owning reference The referenced object’s lifecycle is owned elsewhere

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

ShinyBrowser/AppDelegate.swift:11 — representative type boundary

class AppDelegate: UIResponder, UIApplicationDelegate {
    var window: UIWindow?
}
Type Responsibility Depends on or conforms to
AppDelegate Receives callback-driven events UIResponder, UIApplicationDelegate
ViewController View lifecycle, callbacks, and feature coordination UIViewController

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
AppDelegate (ShinyBrowser/AppDelegate.swift:11) implicit internal No explicit modifier means the Swift declaration is internal to the module. Inference: app-target collaboration needs no exported library surface.
ViewController (ShinyBrowser/ViewController.swift:13) implicit internal No explicit modifier means the Swift declaration is internal to the module. Inference: app-target collaboration needs no exported library surface.

Reference code

ShinyBrowser/AppDelegate.swift:11 — representative boundary

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

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
View lifecycle, callbacks, and feature coordination ViewController The source’s Controller suffix makes this role explicit.
Receives callback-driven events AppDelegate The source’s Delegate suffix makes this role explicit.

Design patterns

Pattern Source evidence Purpose or tradeoff
View-controller organization ShinyBrowser/ViewController.swift:13 A controller is the verified coordination boundary; this is MVC-style only where a separate model is present.
Delegate or data-source callbacks ShinyBrowser/AppDelegate.swift:11 Callback protocols invert event delivery back into the sample’s owner.

Naming conventions

  • Types: Controller: ViewController; Delegate: AppDelegate.
  • Protocols: no local protocol declaration in the scanned source.
  • Methods: viewDidLoad, setUpObservation, loadStartPage, shareAction, addToFavoritesAction, loadStartPageAction, presentPopoverWithActions, reload.
  • Files: ShinyBrowser/AppDelegate.swift, ShinyBrowser/ViewController.swift.

Architecture takeaways

  • AppDelegate is the main source-visible entry or composition anchor for this sample.
  • Framework work reaches UIKit, WebKit 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
ShinyBrowser/AppDelegate.swift AppDelegate
ShinyBrowser/ViewController.swift ViewController