Setting UITableView headers from NSFetchedResultsController

Question

I have a NSFetchedResultsController which is fetching objects from a NSManagedObjectContext. I\'m using the results to populate a UITableView.

Answer 1

I ended up adding a new property day to my NSManagedObject subclass to get a formatted date string.

@property (nonatomic, readonly) NSString * day;
@property (nonatomic, retain) NSDateFormatter * dateFormatter

Sythesize the dateFomatter. @synthesize dateFormatter;

I initialize the date formatter in awakeFromFetch and awakeFromInsert.

self.dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[self.dateFormatter setDateStyle:NSDateFormatterMediumStyle];

The accessor for day.

- (NSString *)day {
  NSDate *date = self.startDate;
  return [self.dateFormatter stringFromDate:date];
}

I then set my section name keypath to look at day; you shouldn't need to make any changes to your sort descriptors.

Answer 2

I haven't had a chance to dig into that area of the SDK yet (my work is with C#, so the iPhone stuff is in my hobby time), but from what I can tell you would want to use the other init, specifically initWithKey:ascending:selector: and for the selector you could pass a selector to your compare method that would only compare on the Year/Month/Day, ignoring time.

Here's the url for reference: iPhone Library Documentation

Hope this helps!