on the screen, if not - presented modally:</h4>
<pre class="highlight swift"><code>    <span class="k">let</span> <span class="nv">screen</span> <span class="o">=</span> <span class="kt">StepAssembly</span><span class="p">(</span>
            <span class="nv">finder</span><span class="p">:</span> <span class="kt">ClassFinder</span><span class="o">&lt;</span><span class="kt">ProductViewController</span><span class="p">,</span> <span class="kt">Any</span><span class="p">?</span><span class="o">&gt;</span><spa