Under the section “Do not allow two popovers to be open at the same time” we ran the function:
splitViewController(_ svc: UISplitViewController, willChangeTo displayMode: UISplitViewControllerDisplayMode)
in order to prevent the popover on the right and the master pane on the left. I couldn’t get both popovers to display before or after adding the code on page 1063-1064. Fairly specific question but: is this something that is no longer able to happen in a later version of Xcode? Does split view controller auto-prevent you from having more than one popover at a time?