fileType
The file type of the document.
Declaration
var fileType: String? { get }Discussion
The file type is a uniform type identifier (UTI). UIKit derives the UTI from the filename-extension component of fileURL.
UIKit sets this property before it calls the completion handlers of the open(completionHandler:), save(to:for:completionHandler:), and revert(toContentsOf:completionHandler:). If, outside of these methods or their completion handlers, you want to wait for any pending file operations to complete before you access this property, you can call performAsynchronousFileAccess(_:) and access the property value in the block parameter.