The iOS App Won't Function Properly when Dragging to Close a Detailed View

[OliverHKU]

Testing environment: iOS13.3

When opening a news item from the "最新新闻" table and then closing it using a dragging down gesture on the top of the view, the same news item can't be opened again. This doesn't happen when the news item is closed by pressing the close button on the bottom of its view.

A similar bug is detected under the view corresponding to the "Wuhan2020" tab. When opening the detail of a hospital using the "查看详情" button and then close it using a dragging down gesture on the top of the view, the entire view under "Wuhan2020" freezes. However, the other 4 tabs (i.e. "主页", "新闻汇总", "同城查询" and "关于") and their corresponding views are not affected when "Wuhan2020" freezes.

It is suspected that a similar bug occurs in every table view where a detailed view can be expanded.

[OliverHKU]

@geastwood reopen