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• Create NSManagedObject subclass file in Xcode 3.2.2

  - by Mark Szymanski

  I am just learning Core Data on iPhone and the tutorial I am following says to create a new file and select NSManagedObject as the template. However, in Xcode 3.2.2 it seems to be gone. Is there any way to get it back or some kind of workaround? Thanks in advance!

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• Managing NSStoreType changes between debug and release builds

  - by Eimantas

  NSXMLTypeStore is used when starting Core Data backed application by default because it's good for debugging purposes. But practice dictates that developer should use either NSBinaryStoreType, NSInMemoryStoreType or NSSQLiteStoreType store types in release builds. How do you manage changes between debug and release builds? I believe that changing…

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• Deploying App With Dummy/Initial Data

  - by mattmccomb

  I have a Core Data based application that stores hierarchal data displayed using a series of UITableViews. To illustrate my app functionality to the user I would like to pre-populate my database/app with some dummy values. This data would be available upon installation on the user's iPhone/iPod Touch. What is the best way to achieve this?

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• Application update, insert data in coredata while preserving userdata without modelchange

  - by Michiel

  Hi, I want to release an update for my app. I'm stuck on how to update the existing core data database which also stores data entered by the user. All i need to do is update a couple of records and preserve current user data. No changes are made to the model. Thanks.

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• Is it true that it's a bad idea to retain any managed object, anywhere?

  - by dontWatchMyProfile

  Because: Core Data owns the life cycle, and it can turn them into a fault at any time today or tomorrow. And probably it won't care much about the retainCount. So I'm curious if retaining managed objects 1) makes any sense 2) or how bad it is, and why it is bad

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• How to group two CABasicAnimation animations and kick them off at the exact same time?

  - by mystify

  I know there is some kind of animation grouping mechanism in core animation. So lets say I have two CABasicAnimation firstAnimation and secondAnimation. How would I group these and how would I kick off the group to start animating?

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• NSSortDescriptor for NSFetchRequestController causes crash when value of sorted attribute is changed

  - by AJ

  I have an Core Data Entity with a number of attributes, which include amount(float), categoryTotal(float) and category(string) The initial ViewController uses a FethchedResultsController to retrieve the entities, and sorts them based on the category and then the categoryTotal. No problems so far. NSManagedObjectContext *moc = [self…

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• backing up user data

  - by shani

  in my app the user saves data in archive using core data and sqllite. 1. is there a way letting him the option to back up his data and restoring it in the future? 2. does the user info is backed up with the iphone regular back up? thanks shani

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• populate CoreData data model from JSON files prior to app start

  - by johannes_d

  I am creating an iPad App that displays data I got from an API in JSON format. My Core Data model has several entities(Countries, Events, Talks, ...). For each entity I have one .json file that contains all instances of the entity and its attributes as well as its relationships. I would like to populate my Core Data data model with…

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• Decide which caching startegy to use ?

  - by hib

  Hi all, I want to cache my loaded data so that I can reduce my application start time . I know several strategies to store application data i.e. core data, nsuserdefaults , archiving . Now my scenario is that suppose that I have array of maximum 10 objects each object having 5 fields . So I can not decide which strategy to…

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• iPhone SDK: Track users location using GPS

  - by Nic Hubbard

  I have a few questions about CoreLocation and GPS. First, what method in core location is used to continually get the users current coordinates? And at what interval should these be retrieved? Second, should these coordinates be pushed into a NSMutableArray each time they are received, so that the array of coordinates will…

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• How to draw a line with an arrow head?

  - by Rose

  I need to draw a line with an arrow head. How can i do this using Core graphics. Any help!!!

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• Best practices and Design Patterns for iPhone forms?

  - by cannyboy

  Part of the app I'm making requires the user to fill in a multi-page form, the contents of which will be saved locally (perhaps using Core Data). Are there any best practices for this? This form just includes text fields. I guess the options are UITextFields, or perhaps a UIWebView, with the fields as part of an html form? Are…

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• How to write an RDF Schema?

  - by trickdev

  I am trying to get my head around using RDF to describe custom resources. I understand there are xmlns' out there such as Dublin Core and foaf which provide predefined element sets. How do I go about creating my own? I may be barking up the wrong tree of course and should stick to xml + xsd?

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• Which sorting algorithm is behind an NSSortDescriptor?

  - by mystify

  Is that thing using bubble sort? Or what exactly? How does it work in context with an NSFetchRequest of Core Data?

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• iPhone Coredata saving error

  - by satyam

  I'm trying to create core data application. Some times when trying to save data, i'm seeing following error: Error: NSInvalidArgumentException, Reason: * -_referenceData64 only defined for abstract class. Define -[NSTemporaryObjectID_default _referenceData64]!, Description: * -_referenceData64 only defined for abstract…

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• How would you go about creating a favorites tab for an iphone application?

  - by user337174

  I would like to add a favorites tab to my iphone app that i am developing. I am using core data to populate a UITableView and would like in the detailed view to be able to add the selected item to the users favorites. Would i go about this by adding the selected item to a new array? I am very new to xcode and iphone…

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• Is it good practice to model to-one relationships in only one direction? Or must they be modeled in

  - by dontWatchMyProfile

  In Core Data, most of the time relationships are modeled bidirectional. But the docs say in another place: It typically only makes sense to model a to-one relationship in one direction.

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• iPhone: Types of persistent store

  - by Lisa

  Hi, I would like to know which type of persistent store would be most appropriate in what situations, like how can I decide where to use core data, property list or archives for my iPhone application. Thanks

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• iPhone. Particle system performance

  - by e40pud

  I try to draw rain and snow as particle system using Core Graphics. In simulator rendering proceeded fine but when I run my app on real device rendering is slow down. So, advise me please approaches to increase particle system drawing performance on iPhone. May be I should use OpenGL for this or CoreAnimation?

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• iphone coredata removing records between two entities connected by relation ship

  - by satyam

  I'm implementing core data in my iphone app. It has two entities. Entity1: LatestData Entity2: LatestDetailedData LatestData has URL, publishedDate, heading LatestDetailedData has URL, NewsDescription, PublishedDate, Author Both entities have same URL for a record. Both the entities are connected with inverse relation…

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• Which methods are good to overwrite when creating custom NSManagedObject subclasses?

  - by mystify

  The Core Data Programming Guide talks a lot about what not to overwrite. So the question is: What is good to overwrite? Like I see it, I can't overwrite -init or -initWithEntity:insertIntoManagedObjectContext: So where else would be a good overwrite point to set up some basic stuff? Or is it generally not needed to…

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• Best way to store a string in an iPhone app?

  - by pkulak

  I've started a new iPhone app that needs to remember a single, 40-char string. That's it. I've hooked into Core Data, and am reading about it now, but it really seems like overkill. Is there an easier way to do something so simple?

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• How to delete data of only one attribute in coredata for iphone?

  - by Warrior

  I am new to iphone development.I want to delete data of only one attribute of core data, I dont want to delete the whole object.How can i do that?thanks.

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• managed object subclasses are not generating implementation files and are incorrectly named

  - by mkc842

  In Xcode 4.6, I generated plenty of managed object subclass files without any problem. But now that I'm trying to do it in Xcode 5, it generates only a .h file. The header file has the correct properties, but it takes the name of my project, rather than the name of the core data entity I selected. Just to be sure I…

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