core-data

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Core data - FetchedResultController returning complicated data structures?

So I have the following structure.Basically a tree view. Each node has a set (NSSet of nodes), each node is a object that contains an NSD开发者_如何学运维ate.[详细]

2023-04-13 00:38 分类：问答
What's the effect of cache to NSFetchedResultsController

I read the doc of course, but I don\'t quite get the meaning of \"setting up any sections and ordering the contents\".[详细]

2023-04-13 00:34 分类：问答
Core Data - How to establish relationship between two objects in different contexts

In my app, I have the following CoreData model : a Foo has many Bar Entities : Foo <---->> Bar. To add a new Foo entity, I create a new MOC in which I create a new instance of Foo. This displays t[详细]

2023-04-12 23:38 分类：问答
Is -makeWindowControllers the best place to initialize an NSPersistentDocument?

When loading an existing document开发者_如何学JAVA using NSPersistentDocument, as part of initialization I\'d like to prepare some content:[详细]

2023-04-12 22:09 分类：问答
NSPredicate, whitespaces in CoreData. How to trim in predicate?

I have a CoreData/SQLite application in which I have \"Parent Categories\" and \"Categories\". I do not have control over the data, some of the \"Parent Categories\" values have trailing white spaces.[详细]

2023-04-12 22:07 分类：问答
insertRowsAtIndexPaths crashes on endUpdates in tableView:willDisplayCell:forRowAtIndexPath only if user scrolls quickly

Ok as the title suggests, I am trying to insert more rows in a uitableview when the user scrolls to the bottom of the list. The whole reason is to lazily load the data for performance reasons with a l[详细]

2023-04-12 22:02 分类：问答
Persistence in iOS: Property List Serialization vs. NSUserDefaults vs. Core Data

I\'m new to iOS. My requirement is to collect several error strings from inside the app and periodically post them to my web service. Each error is a simple NSString ~100 characters long. I may accumu[详细]

2023-04-12 21:59 分类：问答
Executing multiple NSOpeartion synchronously with NSOperationQueue

I have to download multiple files from Server in background process. for this i am using NSOperationQueue. During download i need to maintain when download has started & completed. For this i have[详细]

2023-04-12 20:01 分类：问答
Guide need for debugging crash log

#00x345bbc98 in objc_msgSend () #10x35cd3616 in -[_PFManagedObjectReferenceQueue _processReferenceQueue:] ()[详细]

2023-04-12 16:00 分类：问答
putpkt: Error and testing Core-Data Lightweight migration

I have an xcode project that has 4 targets (2 apps, 1 iPhone and 1 iPad version for each). I have recently implemented Core Data Lightweight Migration.[详细]

2023-04-12 15:43 分类：问答