title: iOS how to replace one tabBarController with another ViewController?
body: <p>I have Tab Bar Controller:</p>
  
  <ol>
  <li>MyProfileViewController</li>
  <li>Tableview</li>
  </ol>
  
  <p>I do this way:</p>
  
  <pre><code>LoginViewController *logInViewController = [[LoginViewController alloc] init];
  [self presentViewController:logInViewController animated:NO completion:NULL];
  </code></pre>
  
  <p>But it covers whole screen, I can't switch tab.
  How to place "LoginViewController" in to "MyProfileViewController" ? </p>