objective-c - uncaught - unrecognized selector sent to instance swift 3

[__NSCFDictionary objectAtIndex:]: selector no reconocido enviado a la instancia

Question

Estoy tratando de analizar un archivo Json en la vista Tabla y estoy obteniendo este error

[__NSCFDictionary objectAtIndex:]: selector no reconocido enviado a la instancia y la aplicación se bloquea. Por favor, ayúdenme, soy nuevo en el desarrollo de iOS.

Mi código

@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

El objeto de nivel superior en su feed es un objeto JSON, no una matriz JSON. Entonces la deserialización te da un NSDictionary, no un NSArray.

Answer 2

El problema es que el feed no es un NSArray , sino un NSDictionary .

Al mirar el JSON, es probable que desee acceder a este conjunto: [feed objectForKey:@"entry"]