Welp, I'm an idiot.

RangeDoesNotWorkThisWay

- (BOOL)doesStringContainSpecificString:(NSString *)passedInString 
{
     NSRange rangeOfString = [passedInString rangeOfString:@"a string"];
     if (rangeOfString.location != NSNotFound) {
          //String was found, do stuff
          return YES;
     } //else string was not found, don't bother
     
     return NO;
}