core-data

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Is there a way to take a look inside a NSManagedObjectContext?

All is in the question, i would if it is possible to look in a NSManagedObjectContext in orde开发者_开发百科r to look how many Entity is actually in etc.If you want to browse the contents of your cont[详细]

2023-04-10 03:54 分类：问答
iOS Core Data migration time out

I am getting this error message (and subsequent crash) in Xcode organiser that I suspect is related to a Core Data migration that takes too long to complete:[详细]

2023-04-10 03:30 分类：问答
How can I detect when a NSPersistentStore needs to be saved?

I have an iOS application where I use coreData to store my \"documents\". They all share a common NSManagedObjectContext, and I frequently save the context.[详细]

2023-04-10 03:23 分类：问答
iPhone Core Data - context

Suppose I create a new project with core data. A project with a root view controller. By default, Apple adds a self.managedObjectContext reference to this main viewController.[详细]

2023-04-10 03:13 分类：问答
Core Data Best Practice for Importing Data

I\'ve got an application (iPad & Mac Lion) which uses CoreData for its storage. The app imports data from a number of hardware devices, decodes the data into a number of discrete events, and prese[详细]

2023-04-10 02:57 分类：问答
How to efficiently fetch one column using CoreData

I have a Table with 50,000 records (table has 8 columns). I need to display only 开发者_运维问答1st column on the Table. I need an array which contains all data from Table only from 1st column. How to[详细]

2023-04-09 23:12 分类：问答
Delete rows in table view associated with core data

My table view is populated from an array containing data in the core data, I want to delete rows while updating the core data correspondingly, here is my code of deletion.[详细]

2023-04-09 22:51 分类：问答
Why does previously saved data not appear in opened document of Core Data app?

I have created the Core Data app that is outlined in this tutorial by Apple using XCode 4. All works fine however when I save the document and reopen it the document window is empty and no data is sho[详细]

2023-04-09 20:41 分类：问答
CoreData - how to create fetchrequest to get array of random attribute values

I have simple model with 2 entities House and Flat. House has to many relation to Flat. Flat has attributes like number and description.[详细]

2023-04-09 18:35 分类：问答
Using core data in an existing project

I need to use core data to persist data for my p开发者_如何转开发roject, what I have done so far compiles well, but when I actually start storing things using core data, the program just quits, and I[详细]

2023-04-09 12:59 分类：问答