QLPreviewController

A QLPreviewController can display previews for many common file types, including the following:

• iWork documents

• Microsoft Office documents

• Rich Text Format, or RTF, documents

• PDF files

• Images

• Text files with a uniform type identifier (UTI) that conforms to the public.text type. To learn more about UTIs, see the Uniform Type Identifiers Reference.

• Comma-separated value, or CSV, files

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

On iOS devices, you can present a QLPreviewController modally by calling present(_:animated:completion:) from a presenting UIViewController, or you can push it into view using a UINavigationController. The preview includes a title taken from the last path component of the item URL. You can override it by implementing a previewItemTitle accessor for the preview item.

To use a 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’s more than one item in the list, a modally presented controller displays navigation arrows to let the user switch among the items. If you pushed a preview controller into view 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, see QLPreviewControllerDataSource and QLPreviewItem.