Question

When I try to use this code:

FacebookViewController *manager = [FacebookViewController sharedManager];

to call a shared manager with this in the .h

+ (FacebookViewController *) sharedManager;

I get this:

Undefined symbols for architecture armv7:
  "_OBJC_CLASS_$_FacebookViewController", referenced from:
  objc-class-ref in ContactFBSViewController.o
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)

What is the problem?

Answer 1

I got that error when I used older Facebook iOS SDK in XCode 4.5.

When I updated Facebook SDK to 3.1 and used the new API, I no longer got that error.