Detailed explanation of imageView size changes of IOS UITableViewCell

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{

  static NSString *CellIdentifier = @"Cell";

  UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

  if(cell == nil){
    cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier];
     = [ objectAtIndex:];

    UIImage *img = [UIImage imageNamed:[ objectAtIndex:]];
     = img;

    //IOS UITableViewCell's imageView size change    CGSize itemSize = CGSizeMake( *2/3,  *2/3);
    UIGraphicsBeginImageContext(itemSize);
    CGRect imageRect = CGRectMake(0.0, 0.0, , );
    [ drawInRect:imageRect];
     = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
  }
  return cell;


}