Did you try like this below:-
[[NSDocumentController sharedDocumentController]newDocument:self];
Frage
I tried
[[NSDocumentController sharedDocumentController] duplicateDocumentWithContentsOfURL:nil
copying:NO
displayName:nil
error:NULL] ;
but it is not working. I have the error
typeForContentsOfURL:error: must be overridden for your application to support non-'file:' URLs.
Lösung
Did you try like this below:-
[[NSDocumentController sharedDocumentController]newDocument:self];
Andere Tipps
I don't really know about the NSDocument+NSDocumentController
machinery but here is my guess . Since I am answering my own question, please don't hesitate to comment or react.
[[NSDocumentController sharedDocumentController] addDocument:[[Document alloc] initWithType:nil
error:NULL]] ;