nsfetchedresultscontroller

问题 I'm using a project find on github that lets me use NSFetchedResultsController and UICollectionView , the project is this in my project i have a Core Data with two Entity, Element and Document , there is a relationship one to many between Element and Document , so an Element can have more Document , but a Document can have only one Element , then i do this in the AppDelegate : - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self

问题 I'm using single NSFetchedResultController to populate both self.tableView and UISearchDisplayControler.tableView . After using search bar and dismissing it if I select any row in the self.tableView I get this error: Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 0 beyond bounds for empty array' I guess that somewhere I miss reloading data but I have no clue where? Here are some methods which I use for populating both tabble

问题 I'm developing a Calendar app on iOS and showing all events in a UITableview with NSFetchedResultsController. Due to some reasons, I can't use EKEvent as event model, so I decide to implement a new Event model. When perform recurring events, there are two ways: For each recurring event, generate all sub-events according to recurring rules, and insert them to core data. Positive: I can use NSFetchedResultsController to show all events in UITableview normally. Negative: For any updates to a

问题 I am having trouble fetching results from Core Data that are sorted by date. I have a DB table that contains football matches. Each match has a homeTeam, awayTeam and kickoffTime. The kickoffTime is an NSDate that stores the date and time the match will start. I want to display the results of a query in a TableView divided into sections by the kickoff date. With the date as the section heading. This is a little more complex than it might first appear. Due to differing time zones a match

问题 I have several table views that send JSON requests to a server, store the results in core data, and display them using an NSFetchedResultsController . I was experimenting with GCD as follows: dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{ // Perform JSON requests. dispatch_async(dispatch_get_main_queue(), ^{ [theTableView reloadData]; }); }); However, this would cause some weird things to happen in the UI. New managed objects would render blank cells, deleted

问题 In my app using coredata i have an entity with two attributes GridValue (numerical value), RecordingDate (NSdate)). The user in one tableview can enter these two values each day and they are recorded with a fetch controller. For more understanding here is a screenshot of the two views concerned with the issue: Th Addviewcontroller is where the user adds a new value and when user clicks on any of the two fields in the static tableview, he is redirected to the "Zahl Datum" view for editing.

问题 This is how I setup NEFetchedResultsController : private func setupOnceFetchedResultsController() { if fetchedResultsController == nil { let context = NSManagedObjectContext.MR_defaultContext() let fetchReguest = NSFetchRequest(entityName: "WLWishlist") let dateDescriptor = NSSortDescriptor(key: "createdAt", ascending: false) fetchReguest.predicate = NSPredicate(format: "ANY users.identifier = %@", String(WLAppSettings.currentUser!.identifier) ) fetchReguest.sortDescriptors = [dateDescriptor]

问题 I'm making an app which fetches a list of products from a server. I then store them in a Core Data database and I present them using GMGridView and the datasource is a NSFetchedResultsController. When I change the product details in the server, I want my iOS app to synchronize and make the necessary changes so I implement the NSFetchedResultsControllerDelegate method. How should I update my gridView properly? - (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id

问题 I just migrated my project to Swift 3 and am stuck on an error for my lazy instantiated NSFetchResultController. I use this method here : https://www.andrewcbancroft.com/2015/03/05/displaying-data-with-nsfetchedresultscontroller-and-swift/ My current code lazy var fetchedResultsController: NSFetchedResultsController = { let primarySortDescriptor = NSSortDescriptor(key: "company", ascending: true) let sortDescriptors = [primarySortDescriptor] self.fetchRequest.sortDescriptors = sortDescriptors

问题 Working fine in Swift 3 with Xcode8.3 I have an project ongoing which has core data for saving messages. It sorts messages according to time and sections them according to day. Here's how: let request = NSFetchRequest(entityName: "Message") let sortDiscriptor = NSSortDescriptor(key: "time", ascending: true) request.sortDescriptors = [sortDiscriptor] fetchedResultsController = NSFetchedResultsController(fetchRequest: request, managedObjectContext: mainThreadMOC, sectionNameKeyPath: