注：superview的个数需按button所在层级来决定

   ProcessTableViewCell *mycell =(ProcessTableViewCell *)[[[btn superview]superview]superview] ;

    // 获取cell的indexPath

    NSIndexPath *myIndex = [self.tableView indexPathForCell:mycell];

    NSLog(@"myIndex.section==%ld",myIndex.section);

    NSLog(@"myIndex.row==%ld",myIndex.row);