If you are opening a aPub file it might work to use some ePub component.
Native iBook files are not support by iOS and there for UIDocumentInterectionController
will not be able to display the file and open iBooks.
QuickLook only supports:
- 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
- Comma-separated value (csv) files