[iOS, Swift] Core Data Model Programmatically in a Swift Package

Data Model File in a XCode Project (.xcdatamodeld)

Data Model

XML

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="18154" systemVersion="20E241" minimumToolsVersion="Automatic" sourceLanguage="Swift" userDefinedModelVersionIdentifier="">
    <entity name="ExampleEntity" representedClassName="ExampleEntity" syncable="YES" codeGenerationType="class">
        <attribute name="name" optional="YES" attributeType="String"/>
        <attribute name="date" optional="YES" attributeType="Date" usesScalarValueType="NO"/>
    </entity>
</model>

Create Core Data Model Programmatically

1. NSManagedObject

public final class ExampleEntity: NSManagedObject {
    @NSManaged var name: String
    @NSManaged var date: Date
}

2. NSEntityDescription

func entityDescription() -> NSEntityDescription {

    let entity = NSEntityDescription()
    entity.name = "ExampleEntity"
    entity.managedObjectClassName = NSStringFromClass(ExampleEntity.self)

    // Attributes
    let nameAttr = NSAttributeDescription()
    nameAttr.name = "name"
    nameAttr.attributeType = .stringAttributeType
    nameAttr.isOptional = true

    let dateAttr = NSAttributeDescription()
    dateAttr.name = "date"
    dateAttr.attributeType = .dateAttributeType

    entity.properties = [nameAttr,
                         dateAttr]

    return entity
}

3. NSManagedObjectModel

func managedObjectModel() -> NSManagedObjectModel {

    let model = NSManagedObjectModel()

    model.entities = [entityDescription()]

    return model
}

4. NSPersistentContainer

lazy var persistentContainer: NSPersistentContainer = {
    let container = NSPersistentCloudKitContainer(name: "ExampleModel", managedObjectModel: managedObjectModel())

    container.loadPersistentStores(completionHandler: { (storeDescription, error) in
        if let error = error as NSError? {
            fatalError("Unresolved error \(error), \(error.userInfo)")
        }
    })
    return container
}()

Reference

• https://dmytro-anokhin.medium.com/core-data-and-swift-package-manager-6ed9ff70921a