Parsing values from NSArray based on JSON format - ios

Question

I have a NSArray which is based on JSON format. I requested it from the web and saved it in the array. I am trying to use a dictionary to get the values of "categoryname" and "subscore" and store them in new arrays, but they remain empty. Do I have to convert the array back to NSData using JSON serialisation or is there a more direct way to achieve this?
NSArray detailedscore:
{
"articles": [
{
"abstract": "text",
"title": "title"
}
],
"subscore": 3,
"categoryname": "Reporting"
},
{
"articles": [
{
"abstract": "text2",
"title": "title"
}
],
"subscore": 1,
"categoryname": "Power"
}]
}
Code:
for(int i = 0; i < [self.detailedscore count]; i++)
{
NSMutableDictionary * dc = [self.detailedscore objectAtIndex:i];
NSString * score = [dc objectForKey:#"subscore"];
NSString * categoryname = [dc objectForKey:#"categoryname"];
[self.allscores addObject:subscore];
[self.allcategories addObject:categoryname];
for (NSString *yourVar in allcategories) {
NSLog (#"Your Array elements are = %#", yourVar);
}

Answer 1

{} ----> means dictionary, []---> array..... this is a rule I follow while assinging the return value from webservices as NSArray or NSDictionary....
Depending on your current JSON format, perhaps this might give you an idea
NSMutableArray *categoryArray = [NSMutableArray new];
for (NSDictionary *childDict in self.detailedscore)
{
[categoryArray addObject:[childDict objectForkey:#"categoryname"]];
}

Answer 2

If you have the array use below code
for(int i = 0; i < [self.detailedscore count]; i++)
{
NSMutableDictionary * dc = [self.detailedscore objectAtIndex:i];
NSString * score = [dc objectForKey:#"subscore"];
NSString * categoryname = [dc objectForKey:#"categoryname"];
[self.allscores score];
[self.allcategories addObject:categoryname];
for (NSString *yourVar in allcategories) {
NSLog (#"Your Array elements are = %#", yourVar);
}

Answer 3

The problem wasn't in the array or dictionary or the web request. I didn't allocated the NSMutableArrays so they were empty all the time. The code works fine for extracting values from the array in case anyone wants to use it.

Answer 4

Hope this helps.
[NSURLConnection sendAsynchronousRequest:req queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
if (!connectionError) {
NSDictionary *dict=[NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&connectionError];
NSLog(#"Dict %#",dict);
BOOL isValid = [NSJSONSerialization isValidJSONObject:dict];
if (isValid) {
[target getJSONFromresponseDictionary:dict forConnection:strTag error:connectionError];
}
else{
NSString *strResponse = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
[target getStringFromresponseDictionary:strResponse forConnection:strTag error:error];
}