Question

I want to load JSON data through multithreading and parse it to NSDictionary, have done it previously using TWRequest class for twitter feeds, How can I use NSURLRequest to do the same as:

TWRequest *request = [[TWRequest alloc] initWithURL:[NSURL URLWithString: @"https://api.twitter.com/1/statuses/public_timeline.json?screen_name=firdous_ali86&include_entities=true"] parameters:nil requestMethod:TWRequestMethodGET];

    // Notice this is a block, it is the handler to process the response
    [request performRequestWithHandler:^(NSData *responseData, NSHTTPURLResponse *urlResponse, NSError *error)
     {
         if ([urlResponse statusCode] == 200) 
         {
             tweetCollection = [[NSMutableArray alloc] init];
             Tweet *tweet;
             NSError *error;  

             NSArray *dict = [NSJSONSerialization JSONObjectWithData:responseData options:0 error:&error];
         }
    }];

problem is that NSURLRequest doesnt implement performRequestWithHandler method.

Answer 1

i used:

#define kBgQueue dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0) //1
#define kLatestKivaLoansURL [NSURL URLWithString: @"http://my_service_url"] //2

- (void)viewDidLoad
{   
    myCollection = [[NSMutableArray alloc] init];

    [super viewDidLoad];

    dispatch_async(kBgQueue, ^{
        NSData* data = [NSData dataWithContentsOfURL: 
                        kLatestKivaLoansURL];
        NSError* error;
        NSDictionary* jsonDict = [NSJSONSerialization 
                                  JSONObjectWithData:data //1
                                  options:kNilOptions 
                                  error:&error];

        NSArray* myArray = [jsonDict objectForKey:@"response"]; //2

        NSEnumerator *myIterator = [myArray objectEnumerator];
        id anObject;

        Cast *cast;

        while( anObject = [myIterator nextObject])
        {
            cast = [[Cast alloc] init];    
            cast.castTitle = [anObject objectForKey:@"castTitle"];

            [myCollection addObject:cast];
        }
        [myTableView reloadData];
    });
}