nsfetchrequest

I don't know what it is but it happens when is fetching elements, well that's what I asume because the app just freezes, I pause the debugging and the debugger stops at a return [__context executeFetchRequest:request error:&error]; Any help about this will be very appreciated. D33pN16h7 Check this post basically you'll need to lock your persistentStoreCordinator because read only calls aren't thread safe. Apple documentation mention this here . Cheers my friend! 来源： https://stackoverflow.com/questions/8002906/executefetchrequesterror-freezes-app

I have CoreData object "Entity" with @property (nonatomic, retain) NSSet *ImagesSet; Inside ImagesSet are many "ImageEntity" objects. "ImageEntity" have @property (nonatomic, retain) NSNumber * sortKey; How create fetchRequest for "Entity" with imagesSet ordered by sortKey field? NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"Entity" inManagedObjectContext:[[DataManager sharedInstance] mainObjectContext]]; [fetchRequest setEntity:entity]; NSString * predicate = some predicate string......; [fetchRequest

I have two entities one called Post and one called User. Post<<---->User is the relationship in core data. I am using a NSFetchedResultsController to fetch all Post records in my core data stack and then displaying them in a UITableView. Each cell has an image and that image corresponds to a User.profilePicture. Upon initializing I do not download the profile picture from the server, I only download when it scrolls past that cell (lazy load). Once I download it I save the downloaded image to the corresponding User.profilePicture in the core data stack. Is there a way for

I want to do a NSFetchRequest to display my data into a UICollectionView : import UIKit import CoreData let appDelegate: AppDelegate = UIApplication.sharedApplication().delegate as! AppDelegate let context: NSManagedObjectContext = appDelegate.managedObjectContext class GarageViewController: UIViewController, UICollectionViewDelegate,UICollectionViewDataSource { @IBOutlet weak var backgroundView: UIImageView! @IBOutlet weak var collectionView: UICollectionView! var voitures: [Voiture] = [Voiture]() override func viewDidLoad() { super.viewDidLoad() collectionView.reloadData() let fetchRequest =

I have a subclass of the CoreDataTableViewController (subclass of UITAbleViewController dome by the people on Stanford done to link CoreData and TableViews). On this Class, I want to perform a fecth, sorting by an attribute called "definition" and the code which executes it is the following: - (void)setupFetchedResultsController{ NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:self.entity]; request.propertiesToFetch=[NSArray arrayWithObject:@"definition"]; request.returnsDistinctResults=YES; NSPredicate *predicate1 = [NSPredicate predicateWithFormat:@"%K != nil", @

I'm using a remote database with Core Data and when I execute the following fetch requests, depending on the internet connection, it can take some time. I'd like to monitor these two requests and, when they are complete -- whether successful or failed -- I'd like to trigger another method. FetchRequest 1: [self.managedObjectContext executeFetchRequest:fetchRequest1 onSuccess:^(NSArray *results) { //Succcess [self.refreshControl endRefreshing]; } onFailure:^(NSError *error) { [self.refreshControl endRefreshing]; }]; FetchRequest 2: [self.managedObjectContext executeFetchRequest:fetchRequest2