NSJSONSerialization Json Nested Sub - iphone

Question

Im trying to get deep into a nested JSon Array, i have successfully done it for the level above but I cant work out how to get any deeper.
I need to log the image #url I have attached a screen show to show where i need it to go.
Thanks :)
- (void)viewDidLoad
{
[super viewDidLoad];
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
NSURL *url = [NSURL URLWithString:#"http://api.storageroomapp.com/accounts/511a4f810f66026b640007b8/collections/511a51580f66023bff000ce9/entries.json?auth_token=Zty6nKsFyqpy7Yp5DP1L&preview_api=1"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[[NSURLConnection alloc] initWithRequest:request delegate:self];
}
-(void)connectionDidFinishLoading:(NSURLConnection *) connection{
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
NSDictionary *dictionary = [NSJSONSerialization JSONObjectWithData:data options:nil error:nil];
NSDictionary *arrayDictionary = dictionary[#"array"];
news = arrayDictionary[#"resources"];
[tableView reloadData];
}
-(void) connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{
UIAlertView *errorView = [[UIAlertView alloc] initWithTitle:#"Error" message:#"The data could not be downloaded - please make sure you're connected to either 3G or Wi-FI" delegate:nil cancelButtonTitle:#"Dismiss" otherButtonTitles:nil];
[errorView show];
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
}
-(int)numberOfSectionsInTableView:(UITableView *)tableView{
return 1;
}
-(int)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return [news count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
NSDictionary *newsItem = news[[indexPath row]];
NSString *title = newsItem[#"title"];
NSString *date = newsItem[#"date"];
NSString *thumb = newsItem[#"tablethumb"];
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"MainCell"];
if (cell == nil) {
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:#"MainCell"];
[[cell textLabel] setText:title];
[[cell detailTextLabel] setText:date];
if((NSNull *)thumb == [NSNull null]){
NSLog(#"no image");
} else{
NSLog(# "image = %#", thumb);
}
}
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
return cell;
}

Answer 1

For traversing nested objects you could use valueForKeyPath method and use the dot syntax to drill down the hieararchy.
Something like this would fetch the url value from your newsItem dictionary:
NSDictionary *newsItem = news[[indexPath row]];
NSString *thumbUrl = [newsItem valueForKeyPath:#"tablethumb.url"];
PS. If you really have the properties prefixed by # then you might get into trouble by using valueForKeyPath since # is a special token used as an operator. In this case you could do something like this instead:
NSDictionary *newsItem = news[[indexPath row]];
id tablethumb = [newsItem objectForKey:#"tablethumb"];
NSString *thumbUrl = #"";
// Check if not null and access the #url
if (tablethumb != [NSNull null])
thumbUrl = tablethumb[#"#url"];

Answer 2

Try to access value from dictionary like this,
NSLog(#"URL: %#",[newsItem objectForKey:#"#url"]);