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extension ContentView { | |
final class ViewModel: NSObject, NSFetchedResultsControllerDelegate, ObservableObject { | |
private let colorController: NSFetchedResultsController<ColorItem> | |
init(managedObjectContext: NSManagedObjectContext) { | |
let sortDescriptors = [NSSortDescriptor(keyPath: \ColorItem.hex, ascending: true)] | |
colorController = ColorItem.resultsController(context: managedObjectContext, sortDescriptors: sortDescriptors) | |
super.init() | |
colorController.delegate = self | |
try? colorController.performFetch() | |
} | |
func controllerWillChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) { | |
objectWillChange.send() | |
} | |
var colors: [ColorItem] { | |
return colorController.fetchedObjects ?? [] | |
} | |
} | |
} | |
extension ColorItem { | |
static func resultsController(context: NSManagedObjectContext, sortDescriptors: [NSSortDescriptor] = []) -> NSFetchedResultsController<ColorItem> { | |
let request = NSFetchRequest<ColorItem>(entityName: "ColorItem") | |
request.sortDescriptors = sortDescriptors.isEmpty ? nil : sortDescriptors | |
return NSFetchedResultsController(fetchRequest: request, managedObjectContext: context, sectionNameKeyPath: nil, cacheName: nil) | |
} | |
} |
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