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Same issue, both Xcode 12 and 12.2 beta, reinstalling didn't help.
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With the new @FetchRequest property wrapper, core data fetches can occur directly in the view, per below forum discussion:https://forums.developer.apple.com/message/374407#374407SceneDelegate:import UIKit
import SwiftUI
class SceneDelegate: UIResponder, UIWindowSceneDelegate {
var window: UIWindow?
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
let appDelegate = UIApplication.shared.delegate as! AppDelegate
let context = appDelegate.persistentContainer.viewContext
if let windowScene = scene as? UIWindowScene {
let window = UIWindow(windowScene: windowScene)
window.rootViewController = UIHostingController(rootView: ContentView().environment(\.managedObjectContext, context))
self.window = window
window.makeKeyAndVisible()
}
}ContentView:import SwiftUI
import CoreData
struct ContentView: View {
@Environment(\.managedObjectContext) var managedObjectContext
@FetchRequest(fetchRequest: fetchRequest(), animation: nil) var people : FetchedResults
var body: some View {
List (people, id: \.objectID) {person in
Text("\(person.lastname ?? "")")
Text("\(person.firstname ?? "")")
}
}
//Core Data Fetch Request
static func fetchRequest() -> NSFetchRequest {
let request : NSFetchRequest = Person.fetchRequest()
request.sortDescriptors = [NSSortDescriptor(key: "lastname", ascending: false)]
return request
}
}
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I got mine working by adding: ScrollView(.horizontal) {
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I've just been having problems trying to sort passed through data.
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There are some examples of using Core Data with SwiftUI showing up on github and the web:https://github.com/StephenMcMillan/Dub-Dub-Dohttps://github.com/italoboss/EmotionalDiaryhttps://medium.com/@rosscoops/swiftui-nsfetchedresultscontroller-f9f27718e3d4They seem to work with simple models (one entity), haven't seen any code based on more complex models (multi-entity with relationships) yet, nor have I been able to get a more complex model to work.
