You can't remove this warning. You may get this warning just for using a selector in your own code or third party code(may be because of facebook sdk) that has the same name as some selector that is marked as non-public. Happens to me all the time. Never got rejected for it.
So you won't worry about this warning. See this Ref. , Ref2
And also see this stack question to avoid rejection, find and remove unwanted framework.