Processing JSON in Objective C

Question

How can I go about pulling a single rating value out of a JSON dictionary? The rating value resides only in the parent JSON dictionary (it is not nested). My code is here:

- (void) connectionDidFinishLoading:(NSURLConnection *)connection
{
  NSDictionary *allDataDictionary = [NSJSONSerialization JSONObjectWithData:webData options:0 error:nil];

  for (NSDictionary *diction in allDataDictionary)
  {
    NSString *rating = [diction objectForKey:@"rating"];
    [array addObject:rating];
  }

  [[self myTableView] reloadData];
}

Secondly, how can I make an If statement to convert the rating value to an NSString for it to appear on the iPhone simulator?

Answer 1

In order to fetch all the ratings objects from the dictionary, you can use:

NSArray *array = [allDataDictionary valueForKey:@"rating"];

This depends on the JSON representation and the structure of your data set.

For the second issue, if this object is an NSNumber, you can try this:

if ([[array objectAtIndex:indexPath.row] isKindOfClass:[NSNumber class]]) {
     cell.textLabel.text = [[array objectAtIndex:indexPath.row] stringValue];
}

Note that you have to use isKindOfClass method to check for the class and stringValue to convert to string.