Getting reddit feed as JSON and parsing it - xcode

Question

I'm trying to parse JSON feed from reddit.com and then display it in a tableview. The JSON looks like this:
{
kind: Listing
data: {
modhash: 3lmt2d4hq6797af804da91bde566bd067ddee68e1e7f8e0dda
children: [
{
kind: t3
data: {
domain: imgur.com
banned_by: null
media_embed: { }
subreddit: funny
selftext_html: null
selftext:
likes: null
link_flair_text: null
id: 16e9so
clicked: false
title: I left my dog unattended with the 2 year old...
num_comments: 166
score: 2213
approved_by: null
over_18: false
hidden: false
thumbnail: http://c.thumbs.redditmedia.com/DaoiOlvtdjaPBG3n.jpg
subreddit_id: t5_2qh33
edited: false
link_flair_css_class: null
author_flair_css_class: null
downs: 2481
saved: false
is_self: false
permalink: /r/funny/comments/16e9so/i_left_my_dog_unattended_with_the_2_year_old/
name: t3_16e9so
created: 1357963292
url: http://imgur.com/zGMxP
author_flair_text: null
author: ShaneNickerson
created_utc: 1357934492
media: null
num_reports: null
ups: 4694
}
...more items here
}
And here's my tableview controller code:
#import "mainRedditFunViewController.h"
#define kBgQueue dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)
#define kjsonURL [NSURL URLWithString: #"http://reddit.com/r/funny/.json"
#interface mainRedditFunViewController ()
#end
#implementation mainRedditFunViewController
- (void)viewDidLoad
{
[super viewDidLoad];
dispatch_async(kBgQueue, ^{
NSData* data = [NSData dataWithContentsOfURL:[NSURL URLWithString:#"http://reddit.com/r/funny/.json"]];
[self performSelectorOnMainThread:#selector(fetchedData:)
withObject:data waitUntilDone:YES];
});
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 1;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] ;
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
}
NSDictionary *appsdict = [jsonResults objectAtIndex:indexPath.row];
NSString *VersionString = [appsdict objectForKey:#"url"];
NSString *priceString = [appsdict objectForKey:#"author"];
NSURL *imageURL = [NSURL URLWithString:[appsdict objectForKey:#"thumbnail"]];
NSData *imageData = [NSData dataWithContentsOfURL:imageURL];
UIImage *imageLoad = [[UIImage alloc] initWithData:imageData];
cell.textLabel.text = [appsdict objectForKey:#"title"];
cell.detailTextLabel.text = [NSString stringWithFormat:#"URL: %# Author: $ %# USD",VersionString,priceString];
cell.imageView.image = imageLoad;
return cell;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return [jsonResults count];
}
- (void)fetchedData:(NSData *)responseData {
NSError* error;
NSDictionary* json = [NSJSONSerialization
JSONObjectWithData:responseData
options:kNilOptions
error:&error];
jsonResults = [json objectForKey:#"data.children"];
[self.tableView reloadData];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
However, the output is completly empty. Is there anyway I could fix it? I tried it before with another (smaller) feed and it worked fine. I'm sure if I'm doing the JSONPath formatting correctly, since I'd look like that:
-kind
->data
->children
->data (my items)
->data
->data
...
I'd appreciate any help I get!

Answer 1

Im sorry that this answer is late! hope that it is still needed...
I have altered your code a little bit to access the sub levels of the returned Json results.
You certainly have the right Idea but just need a few more dictionaries in your fetchedData method. If you add these dictionaries in you method underneath your NSJSONSerialization;
NSDictionary* json = [NSJSONSerialization
JSONObjectWithData:data
options:kNilOptions
error:&error];
//NSArray *Fullarray = [[NSArray alloc] initWithObjects:json, nil];
_jsonResult = [[NSMutableArray alloc] init];
NSDictionary *dataDict = [json objectForKey:#"data"];
NSDictionary *chilrenDict = [dataDict objectForKey:#"children"];
for (NSDictionary *informationFromChild in chilrenDict) {
NSLog(#"chil %#", chilrenDict);
[_jsonResult addObject:chilrenDict];
}
Then in your tableView cellForRow change your appsDict to this
NSDictionary *appsdict = [[_jsonResult objectAtIndex:indexPath.row] objectForKey:#"data"];
That should fix up the code and populate the tableView...
You can run a check on this too by checking
NSLog(#"count %i", [_jsonResult count]);
Let me know if this has been of help, happy coding. T