ios - SubViews disappear in Interface Builder -

ok weird. don't use interface builder anymore because of of it's quirks one, working on old project did. when go interface builder of subviews not visible, , they're opaque in document outline. see photo below.

when app runs, works fine. there problem when compressing project zip file, error occurs. know how fix this?

you should check size class here,i think old project build size class , view on another