SwiftUI Notes

A laughably simple sample app for experimenting with SwiftUI and a CloudKit-backed CoreData store.

AppDelegate.swift

Enabling iCloud syncing, merging, and remote-change push notifications:

lazy var persistentContainer: NSPersistentCloudKitContainer = {
    let container = NSPersistentCloudKitContainer(name: "SwiftUI_Notes")

    container.persistentStoreDescriptions.first?
        .setOption(true as NSNumber, forKey: NSPersistentStoreRemoteChangeNotificationPostOptionKey)

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

    container.viewContext.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy
    container.viewContext.automaticallyMergesChangesFromParent = true

    return container
}()

NoteList.swift

A sample SwiftUI List backed by a FetchedResultsController

struct NoteList: View {

    @ObjectBinding var resultsController = FetchedResultsController(
        with: FetchRequest(for: Note.self)
            .sorted(by: \.lastModificationDate, ascending: false))

    var body: some View {
        NavigationView {
            List {
                ForEach(resultsController.objects) { note in
                    NoteCell(note: note)
                }
            }   
        }
    }

}

FetchedResultsController is a Swift interface around an NSFetchedResultsController that conforms to BindableObject.