te when the node is removed.</p>
<div class="aside aside-important">
    <p class="aside-title">Important</p>
    <p>You must call the completion block.</p>

</div>

                      </div>
                      <div class="declaration">
                        <h4>Declaration</h4>
                        <div class="language">
                          <p class="aside-title">Swift</p>
                          <pre class="highlight swift"><code><span class="kd">open</span> <span class="kd">func</span>