contentType
The content type of the source data for the thumbnail request.
Declaration
var contentType: UTType! { get set }Discussion
Quick Look Thumbnailing uses the content type of the source data to determine the provider of the thumbnail and the icon styles it applies when you request iconMode.
If you don’t set this property, Quick Look Thumbnailing derives the content from the file extension. When the file doesn’t have a meaningful extension and you know the content type, set the property directly.