My first view displays an image and action indicator while web-servers and database function are run in that background. I want the application to go to my tab view when the functions have been completed. How do I do this?

Here is what the views look like.

What I have tried:

TabBarViewController *tab = [[TabBarViewController alloc]init];
[self presentViewController:tab animated:NO completion:nil];

and

[self performSegueWithIdentifier:@"first" sender:self];

Please can you help my to understand how to do this. I have spent many hours googling this problem and couldn't work out how to do it.

Thanks

EDIT: Added Code