Cannot declare variable inside @interface or @protocol

Question

I have an iOS app built since the beginning with an error in it. Since the source was began constructed from the template, its appdelegate.h looks like:

@interfa         


        

Answer 1

C Global variables should be declared in .m implementation files, not in .h header files. An extern declaration can go in the .h header files, usually after the includes and outside the interface declarations.

It's also good practice to initialize global object pointers to nil, or else they might contain a garbage object reference.