TwitterOAuthViewController * twitterOAuthVC = [[TwitterOAuthViewController alloc] initWithCompletion:^(BOOL succeeded, id object) {
    if (succeeded && object) {
        NSLog(@"%@",object);
        //do something
    }
}];
UINavigationController * navC = [[UINavigationController alloc] initWithRootViewController:twitterOAuthVC];
[self presentViewController:navC animated:YES completion:NULL];