document
The document that the controller presents or edits.
Declaration
var document: UIDocument? { get set }Discussion
This property represents the document that the document view controller displays. The default value of this property is nil. When the value of the document property is nil, the document view controller presents an empty state view with a message to “Select a document by tapping the ‘Documents’ button at the top.”
When the value of this property is not nil, the document view controller displays the document.