I am trying to get Core Data running with the new Multiplatform SwiftUI on Xcode 12.
Since there is no checkbox for Core Data, I looked at some examples on how to build your own Core Data Stack and pass it in.
So fare so good.
However as soon as I try to make a FetchRequest
My app Crashes with:
I got the PersistentContainer of the form:
Am I missing something essential here?
My Core Data Model is a single entity with a name property.
Since there is no checkbox for Core Data, I looked at some examples on how to build your own Core Data Stack and pass it in.
So fare so good.
However as soon as I try to make a FetchRequest
Code Block swift struct ContentView: View { @FetchRequest(fetchRequest: Entity.fetchRequest()) var entitys: FetchedResults<Entity> var body: some View { Text("Hello, world!") .padding() } }
My app Crashes with:
Here my code:Fatal error: UnsafeRawBufferPointer with negative count
Code Block swift import SwiftUI @main struct CoreDataTemplateApp: App { let context = PersistentCloudKitContainer.persistentContainer.viewContext var body: some Scene { WindowGroup { ContentView() .environment(\.managedObjectContext, context) } } }
I got the PersistentContainer of the form:
Code Block swift import CoreData public class PersistentCloudKitContainer { public static var context: NSManagedObjectContext { return persistentContainer.viewContext } private init() {} public static var persistentContainer: NSPersistentContainer = { let container = NSPersistentContainer(name: "Model") container.loadPersistentStores(completionHandler: { (storeDescription, error) in if let error = error as NSError? { fatalError("Unresolved error \(error), \(error.userInfo)") } }) container.viewContext.automaticallyMergesChangesFromParent = true container.viewContext.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy return container }() public static 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)") } } } }
Am I missing something essential here?
My Core Data Model is a single entity with a name property.