I am using CATiledLayer to render NSManagedObjects. But you know, CATiledLayer render objects in background threads. This make my app crash on iOS5
I know that I should use separated NSManagedContext for each of threads but this way make performance get bad. (because I have to save the NSManagedContext more often to transfer data to other threads).
Do you guys know the better way to work around my problem? Please help!!!
Sorry for my poor English!
NSManagedObjectContext is not thread safe, nor are NSMangedObjects. You should create a MOC on the background thread, pass in any IDs (which ARE thread safe), and load them on the background thread context.
UPDATE:
One alternative is to create plain old obj-c objects, or even just a regular NSDictionay, which contains the necessary data and pass those to the background thread. So after your MO is populated, create a POOCO, copy in the necessary data, and pass that to your background thread for processing. This will avoid disk access.