let dealsSeeMoreViewController = DealsSeeMoreViewController(owner: self)

self.dealsStackView.addArrangedSubview(dealsSeeMoreViewController.view)

只写上面两句的话，dealsSeeMoreViewController可能已经被释放，所以view里面的点击事件会不响应。

要把dealsSeeMoreViewController加进来，如下：

self.addChildViewController(dealsSeeMoreViewController)

dealsSeeMoreViewController.didMoveToParentViewController(self)