lass="aside-title-objc">Swift</p>
                          <pre class="highlight"><code><span class="kd">public</span> <span class="kd">typealias</span> <span class="kt">BlockGroupLayoutCreator</span> <span class="o">=</span> <span class="p">(</span><span class="n">_</span> <span class="nv">engine</span><span class="p">:</span> <span class="kt"><a href="../Classes/LayoutEngine.html">LayoutEngine</a></span><span class="p">)</span> <span class="k">throws</span> <span class="o">-&gt;</span> <span class="kt"><