ios - How to Grab Specific Objects within a Web Service -

i'm using github job web service. here link service:https://jobs.github.com/api

now i'm able retrieve data inside specific url such one:

@"http://jobs.github.com/positions.json?description=python&location=new+york"     

i'm able json data following code:

- (void)viewdidload { [super viewdidload];  nsstring *urlstring = @"http://jobs.github.com/positions.json?description=python&location=new+york";  nsurl *url = [nsurl urlwithstring:urlstring];  nsdata *data = [nsdata datawithcontentsofurl:url];  nsarray *json = [nsjsonserialization jsonobjectwithdata:data options:kniloptions error:nil];  nslog(@"%@", json);  // additional setup after loading view. 

}

now fine, but when try this:

 nsarray *items = [[nsarray alloc] init]; items = json[@"description"]; nslog(@"%@", items); 

i sigabrt , error receive following:

jobsearch[1249:70b] * terminating app due uncaught exception 'nsinvalidargumentexception', reason: '-[__nscfarray objectforkeyedsubscript:]: unrecognized selector sent instance 0x8a82930'

i'm confused because other web services i've used i'm able things this, , "description" should item should able grab. don't seem getting anywhere...

all appreciated, in advance.

first doesn't make sense alloc/init array, because you're overwriting next line

nsarray *items = [[nsarray alloc] init]; items = json[@"description"]; 

also, jsonobjectwithdata returns on object of type id, you're assigning nsdictionary, assumption proves wrong.

nsdictionary *json = [nsjsonserialization jsonobjectwithdata:data options:kniloptions error:nil]; 

apparently method returning array, hence calling json[@"description"] invalid. try using this:

nsarray *json = [nsjsonserialization jsonobjectwithdata:data options:kniloptions error:nil]; nsstring item = [json objectatindex:0];  // grab item array 

without guarantee work. suggest first check kind of object returned, perhaps iskindofclass, see if nsdictionary or array.