No visible @interface for

Question

I have gotten this error on several occasions and am unclear as to what causes the error in general. After looking for over an hour on stack overflow and google I still don\

Answer 1

When I have run into this problem it turned out that Xcode had not reindexed files after changing Git branch. The solution is Delete Derived Data.

Using Xcode version 10.0 File -> Workspace Settings...(or Project Settings...) -> click on the little green circle and manually remove all files in DerivedData folder