Load View if load data complete

Question

I change the view programmatically like that:

 UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    UIViewController *vc = [storyboard instantiateViewControllerWithIdentifier:@"edit"];
    vc.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
    [self presentViewController:vc animated:YES completion:nil];

The problem is, that when I change the view, that the data are not completely loaded. How can I say, that it should wait, until the data is loaded?