Question

This is my sample twitter program it works but there are several errors
if I scroll up or down top and bottom cellls disappears some times I get an error saying :

BAD ACCESS CODE this happens on this row

NSDictionary *tweet = [tweets objectAtIndex:indexPath.row];

Please Advice

#import "TableViewViewController.h"

@interface TableViewViewController ()

@end

@implementation TableViewViewController

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    NSLog(@"tweets array count : %d", tweets.count);
    return tweets.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"TweetCell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }

    NSLog(@"ROW : %d", indexPath.row);

    NSDictionary *tweet = [tweets objectAtIndex:indexPath.row];
    NSString *text = [tweet objectForKey:@"text"];
    NSString *name = [[tweet objectForKey:@"user"] objectForKey:@"name"];

    cell.textLabel.text = text;
    cell.detailTextLabel.text = [NSString stringWithFormat:@"by %@", name];
    return cell;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self fetchTweets];
}

- (void)fetchTweets
{

    NSString *twitterURL = [NSString stringWithFormat:@"https://api.twitter.com/1/statuses/public_timeline.json"];    
    NSURL *fullURL = [NSURL URLWithString:twitterURL];

    NSError *error = nil;
    NSData *dataURL = [NSData dataWithContentsOfURL:fullURL options:0 error:&error];

    tweets  = [NSJSONSerialization JSONObjectWithData:dataURL
                                                      options:kNilOptions
                                                        error:&error];    
}

.....

@end

Answer 1

Found out the answer My app doesn’t support ARC because I didn’t check if we use a retain at the NSJSONSerialization the error is fixed.

 tweets  = [[NSJSONSerialization JSONObjectWithData:dataURL
                                                      options:kNilOptions
                                                        error:&error] retain];