gistfile1.m

#import "SDTableViewCell.h"

@implementation SDTableViewCell

@synthesize iconView;
@synthesize indicatorView;
@synthesize titleLabel;

- (void)dealloc {
    [iconView removeObserver:self forKeyPath:@"image"];
}

- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        self.iconView = [[UIImageView alloc] initWithFrame:CGRectMake(2.0f, 2.0f, 40.0f, 40.0f)];
        [self.contentView addSubview:iconView];
        
        self.indicatorView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
        self.indicatorView.hidesWhenStopped = YES;
        self.indicatorView.frame = CGRectMake(12.0f, 12.0f, 20.0f, 20.0f);
        [self.contentView addSubview:indicatorView];
        
        self.titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(46.0f, 12.0f, 262.0f, 20.0f)];
        [self.contentView addSubview:self.titleLabel];
        
        [self.iconView addObserver:self forKeyPath:@"image" options:0 context:NULL];
    }
    return self;
}

- (void)layoutSubviews {
    [super layoutSubviews];
    
    if (self.iconView.image) {
        [self.indicatorView stopAnimating];
    } else {
        [self.indicatorView startAnimating];
    }
}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
    if (self.iconView.image) {
        [self.indicatorView stopAnimating];
    } else {
        [self.indicatorView startAnimating];
    }
}

@end


==
// Usage
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
    
    SDTableViewCell *cell = (SDTableViewCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil)
    {
        cell = [[SDTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }

    [cell.iconView setImageWithURL:[NSURL URLWithString:[_objects objectAtIndex:indexPath.row]]];
    return cell;
}