I'm running into problems trying to use a NSFetchedResultsController without a corresponding UITableViewController. According to Apples documentation: "NSFetchedResultsController is intended to efficiently manage the results returned from a Core Data fetch request to provide data for a UITableView object." So I first researched whethe...
I'm developing a iPhone app with Core Data. All user data should be synchronized with our servers. For this purpose I created a subclass of NSOperation witch loads new data from our web service and creates corresponding managed objects. To maintain the relationships between them, every object is transmitted with a remoteID (which is the ...
I'm working on an table drill-down style iPhone app that has prepopulated data. I use Core Data and NSFetchedResultsController to populate the table views. In the last level of the table view which shows an item (managed object) I want my user to be able to select that item which should eventualy be shown in another view. That other view...
Hi all, I've any problems for app I'm developing... I'm using Core Data and I just write initial code... But one of my problem is: Core Data won't load data stored in persistent store... This is my code! MyWishesAppDelegate.h #import UIKit/UIKit.h #import CoreData/CoreData.h @interface MyWishesAppDelegate : NSObject { UIWindow ...
My main problem is storing the data which is not supported by Core Data. I already have a CLLocation property stored as a transformable attribute. I think the right approach is to declare a transient coordinate property. I keep getting EXC_BAD_ACCESS errors however. EDIT: My current subclass has the following interface: #import <Found...
A conceptual question: I have data stored hierarchically via Core Data SQLite for an iPhone app. I wish both to draw AND to perform calculations based upon properties of each object in the entire hierarchical arrangement of objects. Both drawing and calculating tasks access the same exact properties. Simple enough. However, I anticipate...
I a, working on coredata iphone TabBar app and passing appdelegate managedObjectContext to all the views and subviews.At some instance i need to create new record for entity A and while entity A didn't saved by the user i need to create another entity B by using the same shared context. Now, my problem is if i save the context for entity...
I have 2 entities - BlogEntry and BlogComments. BlogEntry.comments is a "to many" relationship to BlogComments | BlogEntry | ----------------- | subject | | body | | comments (rel)| | BlogComments | ------------------ | commentText | | blogEntry (rel)| Now, I have a tableview that I want to be able to have ...
Is there any way to export a CoreData model file (i.e entities description: *.xcdatamodeld) to another project. Because re-recreate all entities is boring :-) ...
Hi, I got a crash report and the crashing thread's call stack all show Apple's code. From the looks of it, Core Data's undo manager is accessing an invalid pointer in -[NSManagedObject(_NSInternalMethods) _newSnapshotForUndo__] + 356. I've googled the point of crash and the only other similar crash log I found was from Sequel Pro cras...
I have a CoreData Mac app for which I'm writing an iOS front end. All's working well thusfar, I'm able to successfully read files created with the Mac app in the iOS version. I'm struggling with how to read the NSColor data (being stored as an NSData object in my data model) into a UIColor in iOS version of the app. To summarize: How ...
Overview: I'm designing a restaurant management application, and I have an entity called Order which has Items. Since a restaurant can operate for many years, with many thousands of completed 'orders', and in the interest of making the networking side of my application easier and keeping the database fast, I want to introduce the concept...
I'm designing a Core Data app which needs to keep dated records. Imagine a user works with the program for a while and some records are stored. The user then changes important attributes and relationships (which transcend individual records), and continues using the program with this new configuration. Imagine now that the user looks ba...
Hi all, I've got a view containing a segmentedControl and a tableView. The tableView is populated depending on the segmentedControl item that is selected (in this case Food and wine). The data for the tableView is generated from coreData. It works fine when starting up the application which any of the segmentedControl items selected (...
Hi guys, I have this very strange problem, I'm new to objective-c and it probably comes from depths which I don't comprehend yet. So, in my header file I declare the variable NSString *curTitle; then in .m file I synthesize it: curTitle = [[NSString alloc] init]; after that in other method I assign it: curTitle = string; // strin...
I have a Core Data based UIKit application that allows the user the drag objects around on the screen. While an object is being dragged, I update its position attribute on each touchesMoved: event. To support undoing a drag operation in one go, I start a new undo group at the beginning of the drag, and end the group when the user lifts ...
Hello, I have a problem with my NSFetchRequest, it doesn't seem to be fetching any data, code below: -(void)addAnnotations { NSFetchRequest *request = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"WayPoint" inManagedObjectContext:managedObjectContext]; [request se...
Hi guys, I'm developing an application, which parses XML ant put data to CoreData. I want it to start quickly, so I load data from CoreData first, and after load and parse XML in other thread. The problem is that when the app starts first time CoreData is empty and I start to parse: NSFetchRequest *request = [[NSFetchRequest alloc] init...
As an answer to a question I asked yesterday (http://stackoverflow.com/questions/3293832/new-core-data-entity-identical-to-existing-one-separate-entity-or-other-solution), someone recommended I index an attribute. After much searching on Google for what an 'index' is in SQLite/Core Data, I'm afraid I'm not closer to knowing exactly what...
Hello.. I'm having a problem with relationships between to entities in Core Data. I'm parsing some JSON and adding the entities: if ([hourSets isKindOfClass:[NSArray class]]) { // check to see that we have got some hours back for (NSDictionary *hourSet in hourSets) { Hourset *thisHourSet = (Hourset *)[NSEntityDescription ...