Under the subheading Managing the Lifetimes of Objects from Nib Files That is the opposite of that that document says Outlets should generally be weak, except for those from File’s Owner to top-level objects in a nib file (or, in iOS, a storyboard scene) which should be strong. (as of 2023-01-19 the document was last updated 2013-3-21)

needs more detail on step 3