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2014/10/15 ¤U¤È 10:13:57
iphone Programming Glossary: setfetchbatchsizeHow do i avoid running out of memory when performing a task on every item of core data? http://stackoverflow.com/questions/12448545/how-do-i-avoid-running-out-of-memory-when-performing-a-task-on-every-item-of-cor i entry.version @ 1.1 i But it runs out of memory before it's got through every result. I'm aware of this request setFetchBatchSize 20 But I'm wondering how that would work with what I have Would it stop processing after 20 results or would it just grab.. batch iphone objective c ios core data memory share improve this question You guessed right. You have to use setFetchBatchSize . This will only return the first 20 objects. If you want to get the next 20 objects you have to set the offset using setFetchOffset..
Cocoa Touch: When does an NSFetchedResultsController become necessary to manage a Core Data fetch? http://stackoverflow.com/questions/1263723/cocoa-touch-when-does-an-nsfetchedresultscontroller-become-necessary-to-manage Performance wise it can lead to a huge improvement as well. Rather than fetching in your entire data set if you use setFetchBatchSize with the NSFetchRequest that you feed into the NSFetchedResultsController you can do batched fetching where only the relevant..
Fetching Core Data in the background http://stackoverflow.com/questions/1733117/fetching-core-data-in-the-background multithreading your fetch request I'd take a hard look into why it's taking so long to load. I'd first recommend using setFetchBatchSize on your NSFetchRequest to limit the number of objects loaded into memory via your fetch which will save you a lot of memory..
iPhone SDK Core Data: Fetch all entities with a nil relationship? http://stackoverflow.com/questions/2745994/iphone-sdk-core-data-fetch-all-entities-with-a-nil-relationship entityForName @ Book inManagedObjectContext self.managedObjectContext fetchRequest setEntity entity fetchRequest setFetchBatchSize 20 NSPredicate predicate NSPredicate predicateWithFormat @ author nil fetchRequest setPredicate predicate NSSortDescriptor..
NSFetchedResultsController refresh refetch? http://stackoverflow.com/questions/3399012/nsfetchedresultscontroller-refresh-refetch setPredicate predicate fetchRequest setSortDescriptors sortDescriptors fetchRequest setEntity entity fetchRequest setFetchBatchSize 20 NSFetchedResultsController frc NSFetchedResultsController alloc initWithFetchRequest fetchRequest managedObjectContext..
How to filter NSFetchedResultsController (CoreData) with UISearchDisplayController/UISearchBar http://stackoverflow.com/questions/4471289/how-to-filter-nsfetchedresultscontroller-coredata-with-uisearchdisplaycontroll predicateArray fetchRequest setPredicate filterPredicate Set the batch size to a suitable number. fetchRequest setFetchBatchSize 20 fetchRequest setSortDescriptors sortDescriptors Edit the section name key path and cache name if appropriate. nil for..
NSFetchedResultsController custom sort not getting called http://stackoverflow.com/questions/4789782/nsfetchedresultscontroller-custom-sort-not-getting-called self.managedObjectContext fetchRequest setEntity entity Set the batch size to a suitable number. fetchRequest setFetchBatchSize 20 NSSortDescriptor sortDescriptor NSSortDescriptor alloc initWithKey @ objectName ascending YES comparator ^ id s1 id s2..
How to list only online users on facebook with xmpp framework http://stackoverflow.com/questions/5300912/how-to-list-only-online-users-on-facebook-with-xmpp-framework NSFetchRequest alloc init fetchRequest setEntity entity fetchRequest setSortDescriptors sortDescriptors fetchRequest setFetchBatchSize 10 fetchedResultsController NSFetchedResultsController alloc initWithFetchRequest fetchRequest managedObjectContext..
Getting an NSInvalidArguementException error http://stackoverflow.com/questions/5815549/getting-an-nsinvalidarguementexception-error predicateWithFormat @ ANY exerciseToRoutine @ theSelectedRoutine Set the batch size to a suitable number. fetchRequest setFetchBatchSize 20 Edit the sort key as appropriate. NSSortDescriptor sortDescriptor NSSortDescriptor alloc initWithKey @ name ascending.. predicateWithFormat @ ANY exerciseToRoutine @ theSelectedRoutine Set the batch size to a suitable number. fetchRequest setFetchBatchSize 20 Edit the sort key as appropriate. NSSortDescriptor sortDescriptor NSSortDescriptor alloc initWithKey @ name ascending..
Distinct Count via Core Data, NSExpression Into NSFetchedResultsController http://stackoverflow.com/questions/9157436/distinct-count-via-core-data-nsexpression-into-nsfetchedresultscontroller YES fetchRequest setResultType NSDictionaryResultType fetchRequest setPropertiesToFetch propertiesToFetch fetchRequest setFetchBatchSize 20 NSSortDescriptor sortDescriptor NSSortDescriptor alloc initWithKey strFieldName ascending YES NSArray sortDescriptors..
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