如何将预先存在的sqlite文件导入Core Data？

import CoreData

func importSQLiteFileIntoCoreData(sqliteFilePath: String, managedObjectContext: NSManagedObjectContext) {
    // 1. Create a persistent store coordinator.
    let persistentStoreCoordinator = NSPersistentStoreCoordinator(managedObjectModel: managedObjectContext.persistentStoreCoordinator!.managedObjectModel)

    // 2. Create a dictionary with the options for the SQLite store.
    let options = [
        NSMigratePersistentStoresAutomaticallyOption: true,
        NSInferMappingModelAutomaticallyOption: true
    ]

    // 3. Add the SQLite store to the persistent store coordinator.
    do {
        try persistentStoreCoordinator.addPersistentStore(ofType: NSSQLiteStoreType, configurationName: nil, at: URL(fileURLWithPath: sqliteFilePath), options: options)
    } catch {
        print("Error adding SQLite store to the persistent store coordinator: \(error)")
        return
    }

    // 4. Fetch all objects from the SQLite store.
    let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "YourEntityName")
    fetchRequest.includesPropertyValues = false

    do {
        let objects = try managedObjectContext.fetch(fetchRequest)

        // 5. Loop through the objects and insert them into the Core Data store.
        for object in objects {
            let managedObject = NSEntityDescription.insertNewObject(forEntityName: "YourEntityName", into: managedObjectContext)

            // 6. Copy the values from the SQLite object to the Core Data object.
            for attribute in object.entity.attributesByName {
                managedObject.setValue(object.value(forKey: attribute.key), forKey: attribute.key)
            }

            // 7. Save the changes to the Core Data store.
            do {
                try managedObjectContext.save()
            } catch {
                print("Error saving changes to the Core Data store: \(error)")
            }
        }
    } catch {
        print("Error fetching objects from the SQLite store: \(error)")
    }
}