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import WidgetKit | |
import SwiftUI | |
import CoreData | |
struct Provider: TimelineProvider { | |
var managedObjectContext : NSManagedObjectContext | |
init(context : NSManagedObjectContext) { | |
self.managedObjectContext = context | |
} | |
func placeholder(in context: Context) -> SimpleEntry { | |
SimpleEntry(date: Date()) | |
} | |
func getSnapshot(in context: Context, completion: @escaping (SimpleEntry) -> ()) { | |
let entry = SimpleEntry(date: Date()) | |
completion(entry) | |
} | |
func getTimeline(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) | |
entries.append(entry) | |
} | |
let timeline = Timeline(entries: entries, policy: .atEnd) | |
completion(timeline) | |
} | |
} | |
struct SimpleEntry: TimelineEntry { | |
let date: Date | |
} | |
struct BooksWidgetEntryView : View { | |
var entry: Provider.Entry | |
@Environment(\.managedObjectContext) var moc | |
@FetchRequest(entity: Book.entity(), sortDescriptors: [NSSortDescriptor(keyPath: \Book.date, ascending: true)]) var books: FetchedResults<Book> | |
var body: some View { | |
Text("Test") | |
} | |
} | |
public extension URL { | |
/// Returns a URL for the given app group and database pointing to the sqlite database. | |
static func storeURL(for appGroup: String, databaseName: String) -> URL { | |
guard let fileContainer = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: appGroup) else { | |
fatalError("Shared file container could not be created.") | |
} | |
return fileContainer.appendingPathComponent("\(databaseName).sqlite") | |
} | |
} | |
public enum AppGroup: String { | |
case facts = "group.app-group-books" | |
public var containerURL: URL { | |
switch self { | |
case .facts: | |
return FileManager.default.containerURL( | |
forSecurityApplicationGroupIdentifier: self.rawValue)! | |
} | |
} | |
} | |
// MARK: - Core Data stack | |
var persistentContainer: NSPersistentCloudKitContainer = { | |
/* | |
The persistent container for the application. This implementation | |
creates and returns a container, having loaded the store for the | |
application to it. This property is optional since there are legitimate | |
error conditions that could cause the creation of the store to fail. | |
*/ | |
let storeURL = AppGroup.facts.containerURL.appendingPathComponent("Books") | |
let description = NSPersistentStoreDescription(url: storeURL) | |
let container = NSPersistentCloudKitContainer(name: "Books") | |
container.persistentStoreDescriptions = [description] | |
description.setOption(true as NSObject, forKey: NSPersistentStoreRemoteChangeNotificationPostOptionKey) | |
container.loadPersistentStores(completionHandler: { (storeDescription, error) in | |
if let error = error as NSError? { | |
// Replace this implementation with code to handle the error appropriately. | |
// fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development. | |
/* | |
Typical reasons for an error here include: | |
* The parent directory does not exist, cannot be created, or disallows writing. | |
* The persistent store is not accessible, due to permissions or data protection when the device is locked. | |
* The device is out of space. | |
* The store could not be migrated to the current model version. | |
Check the error message to determine what the actual problem was. | |
*/ | |
fatalError("Unresolved error \(error), \(error.userInfo)") | |
} | |
}) | |
container.viewContext.automaticallyMergesChangesFromParent = true | |
container.viewContext.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy | |
return container | |
}() | |
@main | |
struct BooksWidget: Widget { | |
let kind: String = "BooksWidget" | |
@Environment(\.managedObjectContext) var moc | |
var body: some WidgetConfiguration { | |
StaticConfiguration(kind: kind, provider: Provider(context: persistentContainer.viewContext)) { entry in | |
BooksWidgetEntryView(entry: entry) | |
.environment(\.managedObjectContext, self.moc) | |
} | |
.configurationDisplayName("My Widget") | |
.description("This is an example widget.") | |
} | |
} | |
struct BooksWidget_Previews: PreviewProvider { | |
static var previews: some View { | |
BooksWidgetEntryView(entry: SimpleEntry(date: Date())) | |
.previewContext(WidgetPreviewContext(family: .systemSmall)) | |
} | |
} |
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