QLPreviewReply
The class you create when providing a data-based Quick Look preview extension.
Declaration
class QLPreviewReplyOverview
Create an instance of QLPreviewReply from the method providePreview(for:completionHandler:) in your subclass of QLPreviewProvider. Create an instance to return data, such as an image, PDF, or HTML, that the system displays as the preview for the content that QLFilePreviewRequest specifies.