[cell.btn addTarget:selfaction:@selector(didButtonClick:event:)forControlEvents:UIControlEventTouchUpInside];

- (void)didButtonClick:(UIButton *)senderevent:(id)event{

    NSSet*touches=[event allTouches];

    UITouch*touch=[touches anyObject];

    CGPoint cureentTouchPosition=[touch locationInView:self.tableView];

    //得到indexPath

    NSIndexPath *indexPath=[self.tableView indexPathForRowAtPoint:cureentTouchPosition];

}