Count how many of a certain object appear in a JSON query - ios

Question

I'm returning JSON with a rough structure like the one below, and I'm trying to figure out how I can count how many platforms there are (in this case, three, but could be anything from 1 to 20 or so). I've returned the JSON into an NSDictionary and am using lines such as these to retrieve the data I need:
_firstLabel.text = _gameDetailDictionary[#"results"][#"name"];
In the above case, it'll grab the name from the results section. Since there are multiple platforms, I need to construct a loop to cycle through each name inside the platforms section. Not too sure how to go about that. All help appreciated!
"results":{
"platforms":[
{
"api_detail_url":"http://",
"site_detail_url":"http://",
"id":18,
"name":"First Name"
},
{
"api_detail_url":"http://",
"site_detail_url":"http://",
"id":116,
"name":"Second Name"
},
{
"api_detail_url":"http://",
"site_detail_url":"http://",
"id":22,
"name":"Third Name"
}
],
EDIT: Here's my fetchJSON method:
- (NSDictionary *) fetchJSONDetail: (NSString *) detailGBID {
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible: YES];
NSString *preparedDetailURLString = [NSString stringWithFormat:#"http://whatever/format=json", detailGBID];
NSLog(#"Doing a detailed search for game ID %#", detailGBID);
NSData *jsonData = [NSData dataWithContentsOfURL: [NSURL URLWithString:preparedDetailURLString]];
_resultsOfSearch = [[NSDictionary alloc] init];
if (jsonData) {
_resultsOfSearch = [NSJSONSerialization JSONObjectWithData: jsonData
options: NSJSONReadingMutableContainers
error: nil];
}
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible: NO];
NSString *results = _resultsOfSearch[#"number_of_page_results"];
_numberOfSearchResults = [results intValue];
NSArray *platforms = [_resultsOfSearch valueForKey:#"platforms"];
int platformsCount = [platforms count];
NSLog(#"This game has %d platforms!", platformsCount);
return _resultsOfSearch;
}

Answer 1

The "platforms" JSON field is an array, so assuming you've de-serialised the JSON using something like,
NSMutableDictionary *responseJSON = [NSJSONSerialization JSONObjectWithData:resultsData options:NSJSONReadingMutableContainers error:&error];
Then, you can assign platforms to an NSArray,
NSDictionary *results = [responseJSON valueForKey:#"results"];
NSArray *platforms = [results valueForKey:#"platforms"];
...and find the number of platforms via,
int platformsCount = [platforms count];
In your case, where you want to iterate through the platforms, you can use,
for (NSDictionary *platform in platforms)
{
// do something for each platform
}