Lagging local image loading in UItableview - ios

Question

I made an app which load images from photo library or image taken from camera into a table view , but UI freezes every time i scroll up/down or new image added. Here is how i am making the cell for table view .
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath(NSIndexPath*)indexPath {
static NSString *CellIdentifier = #"Cell";
*cell = (UITableViewCell *) [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
cell.imageView.frame = CGRectMake(0, 0, 110, 70);
}
NSError *attributesError = nil; NSString *workSpacePath = [[self applicationDocumentsDirectory] stringByAppendingPathComponent:[images objectAtIndex:indexPath.row]];
NSDictionary *fileAttributes = [[NSFileManager defaultManager]attributesOfItemAtPath:workSpacePath error:&attributesError];
NSNumber * fileSizeNumber = [fileAttributes objectForKey:NSFileSize];
long long int fileKBSize = [fileSizeNumber longLongValue]/1024;
if (fileKBSize > 1024)
{
cell.textLabel.text = [NSString stringWithFormat:#"File name #%i (%lli MB)",indexPath.row + 1,fileKBSize / 1024];
}
else
{
cell.textLabel.text = [NSString stringWithFormat:#"File name #%i (%lli KB)",indexPath.row + 1,fileKBSize];
}
cell.textLabel.backgroundColor = [UIColor clearColor]; NSString *descriptionString = [images objectAtIndex:indexPath.row];
NSLog(#"descriptionString :%#",descriptionString);
if ([[despDectionary objectForKey:descriptionString] length] > 0)
{
cell.detailTextLabel.text = [NSString stringWithFormat:#"%#",[despDectionary objectForKey:descriptionString]];
}
else
{
cell.detailTextLabel.text = #"File Description";
}
dispatch_queue_t bg = dispatch_queue_create("Back Ground", NULL);
dispatch_async(bg,^(void)
{
UIImage *image=[UIImage imageWithData:[NSData dataWithContentsOfFile:workSpacePath]];
dispatch_async(dispatch_get_main_queue(), ^{
//cell.imageView.frame = CGRectMake(0, 0, 110, 70); cell.imageView.image = image;
});
});
cell.detailTextLabel.backgroundColor = [UIColor clearColor];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
UIButton * button = [UIButton buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake(250, 0, 49,56);
[button setImage:[UIImage imageNamed:#"deletButotn.png"] forState:UIControlStateNormal];
button.tag = indexPath.row;
[button addTarget:self action:#selector(deleteButtonAction:) forControlEvents:UIControlEventTouchUpInside];
[cell.contentView addSubview:button];
return cell;
}
Can somebody please suggest me any solution?