I have a situation where there are two sections in a table view. The first
section should have its rows sorted according to a certain index stored in the
managed object, while the second section should have its rows sorted
alphabetically by the name of its managed objects.
How can I create a *single* fetched results controller that sorts different
sections differently? From reading the docs for NSFetchedResultsController, in
a situation with several sections, the first sort descriptor is responsible for
splitting the data into sections. Fine, by I can't seem to think of a way to
conditionally set the remaining sort descriptors according to which section the
rows fall into.
Here's part of the code I have now:
NSEntityDescription* entity = [NSEntityDescription
entityForName: @"<entity name>"
inManagedObjectContext: self.managedObjectContext];
NSSortDescriptor* sortBySectionName = [[NSSortDescriptor alloc]
initWithKey: @"sectionName"
ascending: YES];
NSSortDescriptor* sortByIndex = [[NSSortDescriptor alloc]
initWithKey: @"index"
ascending: YES];
NSArray* sortDescriptors = [[NSArray alloc]
initWithObjects: sortBySectionName, sortByIndex, nil];
NSFetchRequest* fetchRequest = [[NSFetchRequest alloc] init];
[fetchRequest setEntity: entity];
[fetchRequest setSortDescriptors: sortDescriptors];
It works, but it sorts both sections by the managed object's index. The only
alternative I can think of is to create *two* fetched results controllers, one
as above and the other sorting by section name and then object name (rather
than index). Then, when it comes time to feed the table view, have some logic
that selects data from the appropriate controller. That sounds too cumbersome.
What if I had several more sections, each needing different sorting criteria?
There's got to be an easier way.
Thanks in advance.
WT_______________________________________________
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