How do I customize the search results from SearchViewController?

class CustomSearchViewController: SearchViewController {

    override func didFinish(_ textSearch: TextSearch, term searchTerm: String, searchResults: [SearchResult], isFullSearch: Bool, pageTextFound: Bool) {
        // Filter out the matching search results that are not at the beginning of the word.
        var filteredSearchResults = [SearchResult]()
        searchResults.forEach { searchResult in
            let words = searchResult.previewText.components(separatedBy: .punctuationCharacters)
            words.forEach { word in
                if word.lowercased().hasPrefix(searchTerm.lowercased()) {
                    filteredSearchResults.append(searchResult)
                }
            }
        }
        super.didFinish(textSearch, term: searchTerm, searchResults: filteredSearchResults, isFullSearch: isFullSearch, pageTextFound: pageTextFound)
    }
}

@interface CustomSearchViewController : PSPDFSearchViewController
@end

@implementation CustomSearchViewController

- (void)didFinishSearch:(PSPDFTextSearch *)textSearch term:(NSString *)searchTerm searchResults:(NSArray<PSPDFSearchResult *> *)searchResults isFullSearch:(BOOL)isFullSearch pageTextFound:(BOOL)pageTextFound {
    // Filter out the matching search results that are not at the beginning of the word.
    NSMutableArray<PSPDFSearchResult *> *filteredSearchResults = [NSMutableArray new];
    [searchResults enumerateObjectsUsingBlock:^(PSPDFSearchResult * _Nonnull searchResult, NSUInteger idx, BOOL * _Nonnull stop) {
        NSArray <NSString *> *words = [searchResult.previewText componentsSeparatedByCharactersInSet:[NSCharacterSet punctuationCharacterSet]];
        for (NSString *word in words) {
            if ([word.lowercaseString hasPrefix:searchTerm.lowercaseString]) {
                [filteredSearchResults addObject:searchResult];
            }
        }
    }];

    // Call super with the new filtered search results.
    [super didFinishSearch:textSearch term:searchTerm searchResults:filteredSearchResults isFullSearch:isFullSearch pageTextFound:pageTextFound];
}

@end