Apple Sample Code Architecture
Collection

AppKit sample architecture

Source-backed, high-level architecture notes for Apple sample-code pages grouped in the AppKit folder.

  • Catalog module label: AppKit
  • Coverage: 11 / 11 sample pages documented
  • Source policy: archive hashes and extracted-tree references are verified locally before analysis

Samples

Sample Platforms High-level architecture Documented patterns
Add Functionality to Finder with Action Extensions macOS A nearly empty host app plus three independent extension targets; small NSImage extensions hold reusable transformations. App extension, Framework callback, Shared utility extension
Creating and Customizing the Touch Bar macOS Two parallel implementations—Swift and Objective-C—of the same catalog-style AppKit app. Catalog, Delegate, Storyboard routing, Singleton
Developing a Document-Based App macOS AppKit document architecture: NSDocument bridges a small content model to storyboard-created window and view controllers. Document architecture, Model-View-Controller, Delegate
Enhancing your custom text engine with Writing Tools macOS DocumentViewController composes a text-focused view model with a custom NSView; capability extensions implement editing, selection, pasteboard, and Writing Tools callbacks. View model, Delegate, Capability extensions, Adapter
Integrating a Toolbar and Touch Bar into Your App macOS A content view controller owns the text view; one window controller owns command logic and constructs both command surfaces. Controller, Delegate factory, Target-action, Cocoa binding
Navigating Hierarchical Data Using Outline and Split Views macOS Node model + NSTreeController/outline controller + split/detail controllers, coordinated through notifications and child containment. Model-View-Controller, Observer, Child view controller, Capability extensions
Organize Your User Interface with a Stack View macOS Three small protocols compose a host, header, and body into StackItemContainer; concrete view controllers supply each role. Protocol composition, Container, Template method, State restoration
Restoring your app’s state with AppKit macOS App delegate owns window-controller lifetimes; a restoration factory recreates them; controllers encode identifiers and transient UI state; a singleton manager owns persistent products. State restoration, Factory, Singleton model owner, Delegate
Supporting Collection View Drag and Drop Through File Promises macOS A controller owns collection state and operation queues; PhotoItem owns per-photo loading state; delegate extensions implement drag/drop and file-promise contracts. Model-View-Controller, Operation, Delegate, File promise
Supporting Drag and Drop Through File Promises macOS ImageCanvas owns editing/rendering; ImageCanvasController adapts drag/drop and promise APIs; an immutable snapshot carries deferred export data. Delegate, Snapshot, File promise, Target-action
Supporting Table View Drag and Drop Through File Promises macOS A view controller owns the bound content array and operation queues; model objects lazily load thumbnails; a capability extension implements table and promise protocols. Model-View-Controller, Operation, Delegate, Cocoa binding, File promise

Cross-sample signals

Recurring documented patterns

Pattern label Sample documents
Delegate 7
Model-View-Controller 4
File promise 3
Capability extensions 2
Target-action 2
Cocoa binding 2
State restoration 2
Operation 2

Type-role naming evidence

Counts below are declaration-name suffixes, not inferred patterns.

Role suffix Distinct declarations across samples
Controller 61
View 19
Delegate 18
Operation 4
Handler 2
Manager 2
Provider 2
Document 1
ViewModel 1
Model 1

Swift access-control evidence

These are declaration occurrences in scanned Swift source, including implicit internal declarations.

Access level Occurrences
implicit internal 1880
private 153
public 6
fileprivate 1
private(set) 1

References

Generated from the verified local catalog and completed Markdown documents.