In CoreData, many-relationships are implemented as NSSet objects. In the SwiftData examples, they are shown as arrays. Are they really arrays (i.e., order-preserving and duplicates allowed) or are they arrays made from CoreData NSSets? In my applications, this makes a HUGE difference.

I am upgrading an existing (CoreData-based) iOS app to support CloudKit synchronization. This doesn't work because the app includes an ORDERED relationship. I need to perform a migration from this ordered relationship to something else that supports both CloudKit and maintains ordering. The problem is less about WHAT I need to do to support my requirements as it is HOW to perform the migration (so that my existing customers don't lose data.) Have you encountered this problem? How did you solve it?

I have a Core Data entity with a computed property and I want to sort the objects of this entity by this computed property. So • I build the NSFetchRequest in the normal way, including an NSSortDescriptor for sorting by this computed property. • Construct the usual NSFetchedResultController and call performFetch(). This results in a fatal error: *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'keypath score not found in entity Wine' I've tried to do this in several different ways, including (a) @objc public var score: Float { get { <getter code here> } } (b) Define score in the data model as transient, then @objc public var _score: Float { get { <getter code here> } } ... and ... public override func awakeFromFetch() { super.awakeFromFetch() score = _score } But the error persists. Is there any way to get this to work without abandoning NSFetchedResultsController, fetching unsorted records, sorting them programmatically and building the snapshot from the sorted array of objects? (I know, but it's the best I've been able to come up with so far...)

Back in the days of NCWidgetProviding, we had a button to open our app. We included code like the following in the app's info.plist: <key>CFBundleURLTypes</key> <array> <dict> <key>CFBundleTypeRole</key> <string>Editor</string> <key>CFBundleURLName</key> <string>com.xxxx.yyyy/string> <key>CFBundleURLSchemes</key> <array> <string>yyyy</string> </array> </dict> </array> and in the widget's button, we used code like: let appURL = URL(string: "yyyy://?url=\(zzz)") extensionContext?.open(appURL, completionHandler: nil) How can I achieve the same result using WidgetKit? (I.e., sending a URI to my main app)? The use case is that the widget displays a random record from a database and when the user taps on the widget, I want to open my app, displaying THAT SAME RECORD. Thanks.

Xcode 13.1, iOS 25 SDK I have a UICollectionView (with a custom UICollectionViewLayout) which I am updating with a DiffableDataSource. This CollectionView displays a particular data object (with a given number of sections and items). The user can choose to display a different object (with a different number of sections and items), reusing this CollectionView. When this occurs, I do the following: (pass the new data object to the custom layout) let layout = collectionView.collectionViewLayout layout.invalidateLayout() collectionView.contentSize = layout.collectionViewContentSize (calculate a new snapshot and apply it) When the new data object has FEWER sections and/or items as the first, I get a series of warning messages (one for each of the cells that are no longer in the collection view) as follows: 2021-12-07 14:29:02.239301-0600 WineCorner[82916:1921357] [CollectionView] Layout attributes <UICollectionViewLayoutAttributes: 0x7f77b3047e00> index path: (<NSIndexPath: 0xa0f0b1eb018e754a> {length = 2, path = 0 - 4}); frame = (578.118 6; 160 160); transform = [0.70710678118654757, -0.70710678118654746, 0.70710678118654746, 0.70710678118654757, 0, 0]; zIndex = 1; were received from the layout <WineCorner.WineRackLayout: 0x7f77b1f1a0c0> but are not valid for the data source counts. Attributes will be ignored. Obviously, I am not handling the situation correctly. What should I do so that these warning messages are not issued?