Is there some way to store indexes of objects passing a test other than NSIndexSet?
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I have a table and search bar. The table is generated from a SQLite DB and the search bar searches those objects. The problem I had was when I wanted to know what was the index of the search result, if I just looked at the array of search results and compared to my DB table rows, it couldn't account for duplicate entries (http://stackoverflow.com/questions/11617247/how-can-i-figure-out-what-uitableviewcell-im-clicking-on-during-a-search), so then I implemented a method using `indexesOfObjectsPassingTest` (http://stackoverflow.com/questions/11674498/how-can-i-determine-the-index-of-an-object-in-an-nsmutablearray-when-i-search-fo).

The problem now is, I get an NSIndexSet as my result. I want to be able to query this as I can an NSMutableArray but I know it's not possible, so I'm enumerating the IndexSet, which causes significant memory problems as there are over 5,000 possible results. Is there a better way to do this? I need to determine which items are search results, and then which particular result I'm looking at in the table. 

    //when the user searches, this function is called:
    - (void) getGrapeMatches {
        numSearchGrapes=0;
        listOfTheGrapeIDs = [[NSMutableArray alloc] init];
        for (NSString *str in listOfGrapes)
        {
            NSRange titleResultsRange = [str rangeOfString:searchBar.text options:NSCaseInsensitiveSearch];
            if (titleResultsRange.length > 0) {
                [searchResult addObject:str];
                numSearchGrapes++;
            }
        }
        BOOL (^test)(id obj, NSUInteger idx, BOOL *stop);
    
        test = ^ (id obj, NSUInteger idx, BOOL *stop) {
        
            if ([searchResult containsObject: obj]) {
                return YES;
            }
            return NO;
        };
    
        //this is the part that takes forever because I have over 5000 items in listOfGrapes
        NSIndexSet *indexes = [listOfGrapes indexesOfObjectsPassingTest:test];
        NSUInteger index=[indexes firstIndex];
        while(index != NSNotFound)
        {
            NSString *tempString = [NSString stringWithFormat:@"%d",index];
            [listOfTheGrapeIDs addObject:tempString];
            index=[indexes indexGreaterThanIndex: index];
        }
    }

I rely on having `listOfTheGrapeIDs` because it's the way I figure out what item I'm looking at in the table cell later on. I just wish there were an easier way to do this. Let me know if more code is necessary to help in understanding this problem.