CoreData #data #coreData

coreData.swift

// App Delegate
import CoreData

	func applicationWillTerminate(_ application: UIApplication) {
        self.saveContext()
    }

    // MARK: - Core Data stack

    lazy var persistentContainer: NSPersistentContainer = {

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

    // MARK: - Core Data Saving support

    func saveContext () {
        let context = persistentContainer.viewContext
        if context.hasChanges {
            do {
                try context.save()
            } catch {
                let nserror = error as NSError
                fatalError("Unresolved error \(nserror), \(nserror.userInfo)")
            }
        }
    }


// Controller
import CoreData

	let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext

    func loadModel() {
        let request: NSFetchRequest<Item> = Item.fetchRequest()
        do {
            itemArray = try context.fetch(request)
        } catch {
            print("Error fetchin data: \(error)")
        }
    }
    
    func saveModel() {
        do {
            try context.save()
        } catch {
            print("Error saving context: \(error)")
        }
        
        tableView.reloadData()
    }