core-data_开发者

How to test if Binary Data value exists/been set in CoreData?

I have a binary data attribute in Core Data that depending on a situation gets assigned a value (its actually a voice recording) or not.[详细]

2023-04-13 10:03 分类：问答

Updating and saving multiple UISlider values displaying in UITableView in a Core Data app

I am a newbie so any suggestions for the following problem I am having would be appreciated. I have an app where y开发者_如何学编程ou enter a number of items and then in a subsequent tableview, they[详细]

2023-04-13 08:36 分类：问答

How can I enable iCloud synchronization for my Core Data database?

I want to make my app sync its SQLite Core Data store between devices using iCloud. Right now I let users manua开发者_JAVA百科lly sync their SQLite files using Dropbox, but that is cumbersome for user[详细]

2023-04-13 06:16 分类：问答

Is it possible/sensible to use an in-memory persistent store as a staging area, and if so how do I clear it?

We\'ve got some data coming into our app.Sometimes it will be saved, so we\'ve made an entity and a NSManagedObject subclass for it.Usually, though, the objects will be instantiated and never saved.I\[详细]

2023-04-13 05:56 分类：问答

I'm not getting the NSPersistentStoreDidImportUbiquitousContentChangesNotification (with code sample)

I\'m trying to learn how to use iCloud with coredata. My target is to sync a single database file on mac/ios. Both my mac and iOS apps seem to be updating iCloud as I can see it under System Preferenc[详细]

2023-04-13 05:16 分类：问答

Iphone Retina Display with Core Data user-generated images

I have been looking at this forum on this topic for a while now and still don\'t have a clear picture of how to store images in Core Data successfully for Retina Display.[详细]

2023-04-13 04:57 分类：问答

Store very small sound files with core data

I saw in other posts that it is O.K to store small image files (less then 50 kb) as a bin开发者_JS百科ary data inside core data. is it true for sound files that are less then 20 kb?[详细]

2023-04-13 03:41 分类：问答

Storing NSDate with system time zone in Core Data

When I store a date in CoreData as [NSDate date], it is saved -5:30 difference. In core data I used attribute type as date.[详细]

2023-04-13 03:03 分类：问答

Chaining NSManagedObject accessors: is this bad practice?

Sorry, this is going to be a little vague but here goes: I remember reading once that you should not do the following to traverse NSManagedObject relationships, as the cascading can end up with part[详细]

2023-04-13 02:00 分类：问答

strange warnings for transformable attribute

I was using transformable attributes and everything work fine instead of those warnings: 15.10.11 22:14:07,191 cdtool: CoreData: warning: no NSValueTransformer with class name \'ArrayToDataTransforme[详细]

2023-04-13 01:21 分类：问答