我正在尝试为我的ios应用进行今天的扩展。今天的扩展将基于与核心数据一起保存的数据显示“下一个”课程。我一直在做一些研究,我知道我必须与appGroup共享我的persistentContainer。所以我做了:
public extension NSPersistentContainer {
func addToAppGroup(id: String) {
guard let fileContainer = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: id) else {
fatalError("Shared file container could not be created.")
}
let storeURL = fileContainer.appendingPathComponent("\(self.name).sqlite")
let storeDescription = NSPersistentStoreDescription(url: storeURL)
self.persistentStoreDescriptions.append(storeDescription)
}
}
然后在我的核心数据堆栈中:
internal class CoreDataContainer {
static var persistentContainer: NSPersistentContainer = {
let container = NSPersistentCloudKitContainer(name: "SchoolCompanion")
container.addToAppGroup(id: "group.com.Ce-dricLoneux.School-Companion")
container.loadPersistentStores(completionHandler: { (_, error) in
if let error = error as NSError? {
fatalError("Unresolved error \(error), \(error.userInfo)")
}
})
return container
}()
// MARK: - Core Data Saving support
func saveContext () {
let context = CoreDataContainer.persistentContainer.viewContext
if context.hasChanges {
do {
try context.save()
} catch {
let nserror = error as NSError
fatalError("Unresolved error \(nserror), \(nserror.userInfo)")
}
}
}
}
该文件和xcdatamodel在两个目标之间共享。在这一点上,我认为我可以从扩展名访问我的核心数据,但是当我执行获取请求时,我没有得到任何结果。 controllerDidChangeContent永远不会执行。
class TodayViewController: UIViewController, NCWidgetProviding {
private func configureFetchedResultsController() {
let request: NSFetchRequest<Course> = Course.fetchRequest()
request.sortDescriptors = []
self.fetchedResultsController = NSFetchedResultsController<Course>(fetchRequest: request, managedObjectContext: CoreDataContainer.persistentContainer.viewContext, sectionNameKeyPath: nil, cacheName: nil)
self.fetchedResultsController.delegate = self
do {
try self.fetchedResultsController.performFetch()
} catch {
print(error.localizedDescription)
}
}
override func viewDidLoad() {
super.viewDidLoad()
self.extensionContext?.widgetLargestAvailableDisplayMode = .compact
self.configureFetchedResultsController()
}
func widgetPerformUpdate(completionHandler: (@escaping (NCUpdateResult) -> Void)) {
// Perform any setup necessary in order to update the view.
// If an error is encountered, use NCUpdateResult.Failed
// If there's no update required, use NCUpdateResult.NoData
// If there's an update, use NCUpdateResult.NewData
completionHandler(NCUpdateResult.newData)
}
}
// MARK: - FetchedResultsController Delegate
extension TodayViewController: NSFetchedResultsControllerDelegate {
func controllerDidChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
print("content did change")
}
}
我也尝试过使提取请求不明确,但结果得到一个空数组。为什么我没有得到任何结果?
[另一件事:每次从ios应用程序更新数据时,我都使用nsfetchedResult控制器来刷新视图数据,所以可以吗?还是应该使用widgetPerformUpdate方法?在那种情况下,我们不知道今天的扩展将何时刷新,并且它可能会支付过时的数据。
您的应用程序组的网址在这里:
let url = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "SchoolCompanion)