The API is flexible enough that even the really custom, gesture-based event creation and reordering in the Calendars app was able to be re-implemented on top of the drag-and-drop APIs.

这个 API 非常灵活，就算在日历应用程序中那种高度自定义的基于手势的事件生成与重新安排都可以在拖拽放置 API 之上进行重新实现。