How to reload/update constraints in view when trait collection did change?
<p>Sth is wrong with size classes (I suppose there is a bug), because view is not rendered properly after <code>traitCollectionDidChange</code>. I think so, because when I compile the app in particular orientation, everything looks ok. I am working with <code>UIStackViews</code>. I think I need to do sth within following method:</p>

<pre><code>override func traitCollectionDidChange(previousTraitCollection: UITraitCollection?) {
    //...
}
</code></pre>

<p>Could you help me with this?</p>