CODEWITHSUNDEEP
iosiphoneuitableviewcore-datansfetchedresultscontroller
Jaimeson
Jaimeson

Reputation: 35

Selectively fetching in Core Data for better performance (fetch large items later)

I'm working on an iPhone app using a core data store with about 100 entities, each with the following attributes: a few strings, a small thumbnail image, and the full-size image (stored in an External Record File via Core Data).

These are loaded into a Fetched Results Controller for use in a table view. To increase loading speed and decrease memory usage, how can I prevent the full-size image from being fetched until after a cell is selected?

I'm very new to Core Data, but would a Fetched Property be of use here?

Thanks so much for your help!

Upvotes: 2

Views: 106

Answers (1)

Fogmeister
Fogmeister

Reputation: 77641

I have done this before by moving the image into its own Entity in the model and adding a relation back to the original object.

The new object will be something like...

Image
----------
image (binary data) - store externally (same as the current image)
----------
object - relation to the original object

Then just replace the attribute in the original entity to a relation.

The FRC will then only load the objects and then when you do... object.image it will then get the image object that you can get the image out of.

Upvotes: 2

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