Use the documentation in Swift Playgrounds on iPad
In Swift Playgrounds, you can access the Swift developer documentation—a collection of articles and reference information about the iOS Software Development Kit. It documents the technologies and tools available on iOS and iPadOS for creating games, graphics, user interfaces, and more.
Open the Swift documentation
In the Swift Playgrounds app
on your iPad, open a playground, tap 
in the upper-right corner, then tap Documentation.The documentation replaces the live view. To expand the documentation to full screen, drag the border between the coding area and the live view.
Navigate the Swift documentation
In the Swift Playgrounds app
on your iPad, tap highlighted text in the table of contents or in the articles to follow links to related topics, learn about properties and classes, and so on.As you explore topics, a path (called a jump bar) appears at the top of the page, showing the pages you visited.
To see a list of related topics you can jump to, tap an element in the jump bar.
To search for topics in the Swift Documentation, tap 
.
To close the documentation, tap 
.