QLPreviewController

A displayed preview includes a title taken from the last path component of the item URL. You can override this by implementing a previewItemTitle accessor for the preview item.

A QLPreviewController can display previews for the following items:

• iWork documents

• Microsoft Office documents (Office ‘97 and newer)

• Rich Text Format (RTF) documents

• PDF files

• Images

• Text files whose uniform type identifier (UTI) conforms to the public.text type (see Uniform Type Identifiers Reference)

• Comma-separated value (csv) files

• 3D models in USDZ format (with both standalone and AR views for viewing the model)

A QLPreviewController can be presented modally (that is, full-screen) by calling present(_:animated:completion:) from a presenting UIViewController, or it can be pushed into view using a UINavigationController.

To use a Quick Look preview controller, you must provide a data source object. The data source provides preview items to the controller and tells it how many items to include in a preview navigation list. If there is more than one item in the list, a modally-presented controller displays navigation arrows to let the user switch among the items. For a Quick Look preview controller pushed using a navigation controller, you can provide buttons in the navigation bar for moving through the navigation list.

For details on providing items to a preview controller, refer to QLPreviewControllerDataSource and QLPreviewItem.