title: ContainerView with multiple embed segues
body: <p>Is there a way to have a single ContainerView with multiple embed segues? The aim is for a ContainerView to hold a few different ViewControllers depending on what buttons have been pressed; only one is going to be visible at a time. I want to use embed segues so that in Interface Builder the storyboards are automatically shown at the same size as the ContainerView.</p>
  
  <p>I realise that I can manually resize the other ViewControllers in InterfaceBuilder, but I want the automatic sizing provided by the embed segue. If another way of doing that is available, that would be fine too. Not having the views load on viewDidLoad is fine - as mentioned earlier, the shown ViewController can change depending on the buttons pressed.</p>