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如何索引a NSFetchedResultsController以便我可以在tableview上实现AZ索引.

我在初始化程序中看到我能做到,sectionNameKeyPath但这只是在自己的部分中放置了唯一的对象.

这就是我对我的看法 NSFetchedResultsController

    - (NSFetchedResultsController *)fetchedResultsController
{
    if (__fetchedResultsController != nil) {
        return __fetchedResultsController;
    }

    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];

    NSEntityDescription *entity = [NSEntityDescription entityForName:@"Customer" inManagedObjectContext:self.managedObjectContext];
    [fetchRequest setEntity:entity];

    [fetchRequest setFetchBatchSize:20];

    NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES];
    NSArray *sortDescriptors = [NSArray arrayWithObjects:sortDescriptor, nil];

    [fetchRequest setSortDescriptors:sortDescriptors];

    NSFetchedResultsController *aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext sectionNameKeyPath:@"name" cacheName:@"Customer"];
    aFetchedResultsController.delegate = self;

    self.fetchedResultsController = aFetchedResultsController;

    return __fetchedResultsController;
}