title: Replace view inside UIStackView?
body: <p>I have <code>UIStackView</code> which contains 3 subviews. And it is created via storyboard.</p>
  
  <p>What if I need in some cases replace the middle subview with another one? What is the best way to solve this issue without of recreating the whole stack view programmatically? Both objective-C and Swift solutions are applicable.</p>