This can be done at a level FBRequest.
You need to create FBRequest yourself and use it overrideVersionPartWith:.
Remember that this will only work if your Facebook application was created before API v2.0 was released. New applications are blocked from using the old API in general.
:
FBRequest *request = [FBRequest requestWithGraphPath:@"/me/friends"
parameters:[NSDictionary dictionaryWithObjectsAndKeys:@"20", @"limit", nil]
HTTPMethod:@"GET"];
[request overrideVersionPartWith:@"v1.0"];
[request startWithCompletionHandler:^(FBRequestConnection *connection, id result, NSError *error) {
if (!error) {
NSLog(@"***** user friends with params: %@", result);
} else {
}
}];