你好，我无法在widgetKit扩展上从我的应用程序中检索xcdatamodeld数据。然而，我为两者都添加了appGroup。检查我的模型，并为两者添加xcdatamodeld文件。
我的类核心数据：
public class CoreDataStackT4U {
static let shared = CoreDataStackT4U()
private init() {}
lazy var persistentContainer: NSPersistentContainer = {
let container = NSPersistentContainer(name: "ios")
let storeURL = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "group.fr.app")!.appendingPathComponent("ios.sqlite")
var defaultURL: URL?
if let storeDescription = container.persistentStoreDescriptions.first, let url = storeDescription.url {
defaultURL = FileManager.default.fileExists(atPath: url.path) ? url : nil
}
if defaultURL == nil {
container.persistentStoreDescriptions = [NSPersistentStoreDescription(url: storeURL)]
}
container.loadPersistentStores(completionHandler: { storeDescription, error in
if let error = error as NSError? {
print(error.localizedDescription)
}
})
return container
}()
}
// MARK: - Main context
extension CoreDataStackT4U {
var managedObjectContext: NSManagedObjectContext {
persistentContainer.viewContext
}
func saveContext() {
managedObjectContext.performAndWait {
if managedObjectContext.hasChanges {
do {
try managedObjectContext.save()
} catch {
print(error.localizedDescription)
}
}
}
}
}
和我的课堂小部件：
import WidgetKit
import SwiftUI
import Intents
struct Provider: IntentTimelineProvider {
func placeholder(in context: Context) -> SimpleEntry {
SimpleEntry(date: Date(), configuration: ConfigurationIntent())
}
func getSnapshot(for configuration: ConfigurationIntent, in context: Context, completion: @escaping (SimpleEntry) -> ()) {
let entry = SimpleEntry(date: Date(), configuration: configuration)
completion(entry)
}
func getTimeline(for configuration: ConfigurationIntent, in context: Context, completion: @escaping (Timeline<Entry>) -> ()) {
var entries: [SimpleEntry] = []
// Generate a timeline consisting of five entries an hour apart, starting from the current date.
let currentDate = Date()
for hourOffset in 0 ..< 5 {
let entryDate = Calendar.current.date(byAdding: .hour, value: hourOffset, to: currentDate)!
let entry = SimpleEntry(date: entryDate, configuration: configuration)
entries.append(entry)
}
let timeline = Timeline(entries: entries, policy: .atEnd)
completion(timeline)
}
}
struct SimpleEntry: TimelineEntry {
let date: Date
let configuration: ConfigurationIntent
}
struct t4uWidgetEntryView : View {
var entry: Provider.Entry
var moc = CoreDataStackT4U.shared.managedObjectContext
@FetchRequest(entity: Vehicle.entity(), sortDescriptors: [
NSSortDescriptor(keyPath: Vehicle.name, ascending: true)
]) var vehicles: FetchedResults<Vehicle>
var body: some View {
VStack(alignment: .leading){
Spacer()
Text("White Tiger")
.font(.body)
.bold()
.padding(.bottom, 20)
.padding(.leading, 20)
.padding(.trailing, 20)
.minimumScaleFactor(0.5)
.foregroundColor(.white)
.shadow(
color: Color.black,
radius: 1.0,
x: CGFloat(4),
y: CGFloat(4))
Spacer()
Text("Items count: (vehicles.count)")
.foregroundColor(.white)
.shadow(
color: Color.black,
radius: 1.0,
x: CGFloat(4),
y: CGFloat(4))
}
.frame(maxWidth: .infinity, maxHeight: .infinity)
.edgesIgnoringSafeArea(.all)
.background(
Color.blue.opacity(0.8))
}
}
@main
struct t4uWidget: Widget {
let kind: String = "t4uWidget"
let moc = CoreDataStackT4U.shared.managedObjectContext
var body: some WidgetConfiguration {
IntentConfiguration(kind: kind, intent: ConfigurationIntent.self, provider: Provider()) { entry in
t4uWidgetEntryView(entry: entry)
.environment(.managedObjectContext, self.moc)
}
.configurationDisplayName("My t4u widget")
.description("This is t4u widget.")
}
}
struct t4uWidget_Previews: PreviewProvider {
static var previews: some View {
t4uWidgetEntryView(entry: SimpleEntry(date: Date(), configuration: ConfigurationIntent()))
.previewContext(WidgetPreviewContext(family: .systemSmall))
}
}
对车辆的请求总是0。谢谢你的帮助，举个例子会很有用，因为我没有看到错误。
我忘了添加：
let storeURL = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "group.fr.app")!.appendingPathComponent("ios.sqlite")
在AppDelegate到我的应用程序谢谢。