[__NSCFDictionary objectAtIndex:]: unrecognized selector sent to instance - objective-c

Question

I am trying to parse a Json file into the Table view and I am getting this error
[__NSCFDictionary objectAtIndex:]: unrecognized selector sent to instance
and the app is crashing. Please help me, I am new to iOS development.
My Code
#implementation ViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
self.title = #"Feeds";
[super viewDidLoad];
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
NSURL *url = [NSURL URLWithString:#"http://little-people.blogspot.com/feeds/posts /default?alt=json"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[[NSURLConnection alloc] initWithRequest:request delegate:self];
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
data = [[NSMutableData alloc] init];
NSLog(#"Data Data , %#", data);
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)theData
{
[data appendData:theData];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
feed = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
NSLog(#"Data , %#", feed);
[mainTableView reloadData];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
UIAlertView *errorView = [[UIAlertView alloc] initWithTitle:#"Error" message:#"The download could not complete - 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 [feed count];
NSLog(#"Data Data , %#", feed);
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"MainCell"];
if(cell == nil){
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:#"MainCell"];
}
if (([feed count] - 1) >=indexPath.row) {
cell.textLabel.text = [[feed objectAtIndex:indexPath.row] objectForKey:#"feed"];
cell.detailTextLabel.text = [[feed objectAtIndex:indexPath.row] objectForKey:#"title"];
}
return cell;
}

Answer 1

The problem is that feed is not a NSArray, but a NSDictionary.
Looking at the JSON, you likely want to access this array: [feed objectForKey:#"entry"]

Answer 2

The top level object in your feed is a JSON object, not a JSON array. So the deserialisation gives you an NSDictionary, not an NSArray.