performance.<br>
Returning <code>true</code> with <code>interrupt</code> closure then falls back to <code>reloadData</code>:</p>
<pre class="highlight swift"><code><span class="n">collectionView</span><span class="o">.</span><span class="nf">reload</span><span class="p">(</span><span class="nv">using</span><span class="p">:</span> <span class="n">changeset</span><span class="p">,</span> <span class="nv">interrupt</span><span class="p">:</span> <span class="p">{</span> <span class="nv">$0</span><span class="