Jaanus Kase (via Ole Begemann): The best I can tell, there is no way to do this in Swift that does not look insane and ridiculous. See, -[NSWindowController initWithWindowNibName:] is a convenience initializer on NSWindowController, and Swift is much more restrictive about its initialization behavior in this case. You can’t call the parent’s convenience initializer … Continue reading An Example on How to Use NSProgress