I have the dreaded warning Attribute Unavailable: Automatic Preferred Max Layout Width is not available on iOS versions prior to 8.0, but in my case, Margin does not appear in the storyboard, and the label in question (the one that is highlighted when I click on the warning) has no constraints. In fact, the entire view has no constraints.
I have seen other posts, eg. Attribute Unavailable warning on iOS versions prior to 8.0, but as I said no Margin to find, and no constraint to edit.
I will add constraints and hope it goes away, but it looks like another bug...
