Now, because Table View and Collection View already contain built-in support for drag and drop, adding drag and drop if you're using one of these classes is really simple.

因为桌面视图和集合视图已经包含了对拖拽与放置的内置支持，所以如果你正在使用这些类，那么添加拖拽放置功能就真的很简单了。

Now, if you're displaying your content in a table view or a collection view, new delegate methods make it really easy to add drag-and-drop support with just a few lines of code.

如果你在表格视图或者集合视图上显示你的内容，新的委托方法会让添加拖拽放置变得异常简单，只需几行代码就可以。