Lazy Loading in UITableview In IPhone'

In your Class.h put

NSMutableDictionary *Dict_name;

BOOL isDragging_msg, isDecliring_msg;

Now In Class.m file Put this code.

In view did load

Dict_name = [[NSMutableDictionary alloc] init];

In cell for row at index path

if ([dicImages_msg valueForKey:[[msg_array objectAtIndex:indexPath.row] valueForKey:@"image name or image link"]]) { 
    cell.image_profile.image=[dicImages_msg valueForKey:[[msg_array objectAtIndex:indexPath.row] valueForKey:@"image name or image link"]];
}
else
{
    if (!isDragging_msg && !isDecliring_msg)
    {
        [dicImages_msg setObject:[UIImage imageNamed:@"Placeholder.png"] forKey:[[msg_array objectAtIndex:indexPath.row] valueForKey:@"image name or image link"]];
        [self performSelectorInBackground:@selector(downloadImage_3:) withObject:indexPath];
    }
    else
    {
        cell.image_profile.image=[UIImage imageNamed:@"Placeholder.png"];
    }
}

and for download image the function is:-

-(void)downloadImage_3:(NSIndexPath *)path{
    NSAutoreleasePool *pl = [[NSAutoreleasePool alloc] init];

    NSString *str=[here Your image link for download];

    UIImage *img = [[UIImage alloc] initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:str]]]; 

    [dicImages_msg setObject:img forKey:[[msg_array objectAtIndex:path.row] valueForKey:@"image name or image link same as cell for row"]];

    [tableview performSelectorOnMainThread:@selector(reloadData) withObject:nil waitUntilDone:NO];

    [pl release];
}

and at last put these methods in your class

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{
    isDragging_msg = FALSE;     
    [tableview reloadData];
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
    isDecliring_msg = FALSE;
    [tableview reloadData]; }
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{
    isDragging_msg = TRUE;
}
- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView{
    isDecliring_msg = TRUE; }

Thnaks,