如何基于JSON中的另一个字典键过滤字典值？

Question

I have a table with a UISearchController that searches it. The first table is populated from a JSON with a format of:

{
    "items":
        [
            {
                "title":"title1",
                "url":"url1",
            },

            {
                "title":"title2",
                "url":"url2",
            }
        ]
}

The "title" is shown as the cell's textLabel and the url is the link that opens when the cell is clicked.

When I search in the search bar a results table shows populated by the the titles that match the search criteria. My problem is these don't include the urls so nothing happens when these cells are clicked. My search criteria is as follows:

- (void)updateSearchResultsForSearchController:(UISearchController *)searchController {

    // filter the search results
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF contains [cd] %@", self.searchController.searchBar.text];
    self.results = [[self.JSONarray valueForKey:@"title"] filteredArrayUsingPredicate:predicate];
    [self.tableView reloadData];

}

I can see what I think is the problem but cannot figure out how to fix it. When searching it is only searching through the titles and populating the results array with these but I need the urls to filter based on the corresponding titles.

Any help would be really appreciated.

Answer 1

I'm typing this off the top of my head since I don't have all your code, but try the following:

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"title contains [cd] %@", self.searchController.searchBar.text];
self.results = [self.JSONarray filteredArrayUsingPredicate:predicate];

The difference is that we're not filtering on the title elements of the JSON array first; instead, we're searching the whole array, and using title in the predicate.

After doing this, self.results should be an NSArray of NSDictionary s, each of which contains a title and url element. So you can access the URLs as appropriate to retrieve your results.