core-data

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window = _window

I\'ve been doing a few tutorials on Core Data for the iPhone, and none of them seem to work.Luckily, one of the tutorial sites provided source code and one problem that kept popping up (and is hopeful[详细]

2023-04-12 15:30 分类：问答
Core data with to-many relationship/

I am using core data. I am having 2 Entities Music and Lyrics .I created relationship musicTolyrics with inverse and To-many. I have tosave number of timestamps and lyrics for one song. I m using this[详细]

2023-04-12 14:30 分类：问答
Retrieving data while multi threading

I am using multithreading while loading data from the database. I am doing the following dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),[详细]

2023-04-12 12:32 分类：问答
Core Data - Firing faults

If I have the entities Department and Employee, after fetching all the departments, I can see that the employees are still in fault开发者_StackOverflow. My goal is to get the set of employees related[详细]

2023-04-12 08:32 分类：问答
XCode 4.2: Where has "Value Transformer Name" gone for Core Data attribute type 'Transformable'?

I\'m creating an NSValueTransformer subclass to convert a UIImage to/from an NSData to allow insertion/retrieval to/from a Core Data SQLite database. Howe开发者_运维问答ver, after selecting Attribute[详细]

2023-04-12 08:00 分类：问答
NSManagedObjectContextObjectsDidChangeNotification not always called instantly

I have an Mac Application using a NSPersistentDocument. I want to get notified when Objects are deleted to save this information using Core Data. So I\'m listening for NSManagedObjectContextObjectsDid[详细]

2023-04-12 07:39 分类：问答
Is NSDocument and CoreData a possible combination, or is NSPersistentDocument the only way?

I\'m making an application which creates course timetables for people at my school. This is the rough design I had in mind for the application:[详细]

2023-04-12 07:16 分类：问答
Is a GCD dispatch queue enough to confine a Core Data context to a single thread

I\'m beginning to think the answer to my question is \'No\', but I\'m still confused and uncertain about this. So please confirm. I\'ve already learned the need to be careful when using Core Data with[详细]

2023-04-12 06:03 分类：问答
What is the best strategy to sort entities by distance from current location on iOS

I need to show a list of products sorted by distance to the nearest address of that product\'s compa开发者_如何学Pythonny.[详细]

2023-04-12 05:43 分类：问答
Core Data automatic lightweight migration - switching from unversioned to versioned data model

I am trying to perform a lightweight migration, but I am having a problem because of the way I created my initial datamodel. The initial data model was not versioned, so now the following co开发者_如何[详细]

2023-04-12 05:37 分类：问答