UIViewController+NibCells.h

@interface UIViewController (NibCells)

- (UITableViewCell *)loadTableViewCellFromNibNamed:(NSString *)nibName;
- (UITableViewCell *)loadReusableTableViewCellFromNibNamed:(NSString *)nibName;

@end

UIViewController+NibCells.m

@implementation UIViewController (NibCells)

- (UITableViewCell *)loadTableViewCellFromNibNamed:(NSString *)nibName;
{
  NSArray *bundleItems = [[NSBundle mainBundle] loadNibNamed:nibName owner:self options:nil];
  UITableViewCell *cell = nil;
  for (id item in bundleItems) {
    if ([item isKindOfClass:[UITableViewCell class]]) {
      cell = item;
      break;
    }
  }
  NSAssert1(cell, @"Expected nib named %@ to contain a UITableViewCell", nibName);
  return cell;
}

- (UITableViewCell *)loadReusableTableViewCellFromNibNamed:(NSString *)nibName;
{
  UITableViewCell *cell = [self loadTableViewCellFromNibNamed:nibName];
  NSAssert1(cell.reuseIdentifier, @"Cell in nib named %@ does not have a reuse identifier set", nibName);
  NSAssert2([cell.reuseIdentifier isEqualToString:nibName], @"Expected cell to have a reuse identifier of %@, but it was %@", nibName, cell.reuseIdentifier);
  return cell;
}

@end