Integrating a Core ML Model into Your App

At a glance

Project structure

Source bundle/
├── MarsHabitatPricePredictor/
│   ├── AppDelegate.swift
│   ├── Data Sources/
│   │   ├── GreenhousesDataSource.swift
│   │   ├── PickerViewDataSource.swift
│   │   ├── SizeDataSource.swift
│   │   └── SolarPanelDataSource.swift
│   ├── ViewController.swift
│   ├── ViewController+PickerViewDelegate.swift
│   ├── Feature.swift
│   └── Base.lproj/
│       └── LaunchScreen.storyboard
├── Configuration/
│   └── SampleCode.xcconfig
└── MarsHabitatPricePredictor.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 6 project/configuration file(s) and 7 source declaration(s).

Overall architecture

flowchart LR
    N1["AppDelegate"]
    N2["ViewController"]
    N3["CoreML APIs"]
    N1 --> N2
    N2 --> N3

Reference code

MarsHabitatPricePredictor/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 Core ML.

Ownership and state

classDiagram
    AppDelegate o-- UIWindow : window
    PickerDataSource *-- SolarPanelDataSource : solarPanelsDataSource
    PickerDataSource *-- GreenhousesDataSource : greenhousesDataSource
    PickerDataSource *-- SizeDataSource : sizeDataSource

Ownership evidence

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

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

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

MarsHabitatPricePredictor/AppDelegate.swift:11 — representative type boundary

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

MarsHabitatPricePredictor/Data Sources/PickerViewDataSource.swift:17 — representative boundary

class PickerDataSource: NSObject, UIPickerViewDelegate, UIPickerViewDataSource {
    // ...
    private let solarPanelsDataSource = SolarPanelDataSource()
    // ...
}

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: ViewController; DataSource: GreenhousesDataSource, PickerDataSource, SizeDataSource, SolarPanelDataSource; Delegate: AppDelegate.
• Protocols: no local protocol declaration in the scanned source.
• Methods: title, value, numberOfComponents, pickerView, viewDidLoad, updatePredictedPrice, selectedRow.
• Files: MarsHabitatPricePredictor/AppDelegate.swift, MarsHabitatPricePredictor/Data Sources/GreenhousesDataSource.swift, MarsHabitatPricePredictor/Data Sources/SizeDataSource.swift, MarsHabitatPricePredictor/Data Sources/SolarPanelDataSource.swift, MarsHabitatPricePredictor/ViewController.swift, MarsHabitatPricePredictor/Feature.swift.

Architecture takeaways

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