my iPad app starts with a normal UIView showing a login. After the user logged in the screen is supposed to switch to a split view. XCode\'s SplitViewTemplate (and all examples
maybe not the answer to your question but I have in my App also a login window. What I do is to put the login view above - in my case - TabBar.
I found this post. Best way to switch between UISplitViewController and other view controllers? It seems it really is not supposed to work. You have to put it in the main xib and then apply tricks...
You can put a UISplitViewController into a different XIB. You cannot have it be the owner, but you can have your app's delegate be the owner and load it when it removes the login view.
Then, you just have to handle your login in the app delegate, load the new XIB, and display it.