uitableview image loading with json is not loading properly

I am using this to display some labels and images by json parsing in to tableview but images are not coming at the first launch when scrolling the tableview images are comin and dancing i mean not coming in order format help me with this

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
    {
        self.customCellClass = [tableView dequeueReusableCellWithIdentifier:@"Cell"];
        if (self.customCellClass == nil)
        {
            self.customCellClass = [[CellCustom alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"Cell"];
        }
        self.customCellClass.nameLabel.text = [[arrayData objectAtIndex:indexPath.row] objectForKey:@"name"]; // label
        self.customCellClass.cityLabel.text = [[arrayData objectAtIndex:indexPath.row] objectForKey:@"region"]; // label

        NSString * stripped = [[[arrayData objectAtIndex:indexPath.row] objectForKey:@"summary"] stripHtml]; //label
        self.customCellClass.detailLabel.text = stripped;
        self.customCellClass.mainImage.image = nil;


        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), ^(void) {
            NSData *data0 = [NSData dataWithContentsOfURL:[NSURL URLWithString:[[[arrayData objectAtIndex:indexPath.row]objectForKey:@"images"]objectForKey:@"logo"]]];
            UIImage *image = [UIImage imageWithData:data0];

            dispatch_sync(dispatch_get_main_queue(), ^(void) {
                self.customCellClass.mainImage.image = image;
            });
        });
        return self.customCellClass;

    }