• (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath{

  // 如果 cell 内部的控件加在 cell.contentView 需要改变cell.contentView

  // 否则 改变 cell
  cell.alpha = 0.5;

    CGAffineTransform transformScale = CGAffineTransformMakeScale(0.3,0.8);
    CGAffineTransform transformTranslate = CGAffineTransformMakeTranslation(0.5, 0.6);
    
    cell.transform = CGAffineTransformConcat(transformScale, transformTranslate);
    
    [tableView bringSubviewToFront:cell];
    [UIView animateWithDuration:.4f
                          delay:0
                        options:UIViewAnimationOptionAllowUserInteraction
                     animations:^{
                         
                         cell.alpha = 1;
                         //清空 transform
                         cell.transform = CGAffineTransformIdentity;
                         
                     } completion:nil];
  

}