title: How do I update elements of the parent view/viewController from a ContainerView?
body: <p>I have a ViewController, which holds a ContainerView.
  So therefore I added a class for the ViewController() and a class for the ContainerViews ViewController(). To Illustrate it in better, I have attaced a photo of my storboard scene:
  <a href="https://i.stack.imgur.com/LOUw2.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/LOUw2.png" alt="enter image description here"></a></p>
  
  <p>When I click the button inside the ContainerView I want to update the Label with a different text, how do I achieve this? IMPORTANT: The ContainerViews button is an IBAction in a seperate ViewController and I want to update the IBOutlet in the seperate ViewController() class. Thanks very much for help!!!</p>