n> <span class="kt"><a href="../Structs/CharacteristicIdentifier.html">CharacteristicIdentifier</a></span><span class="p">,</span> <span class="nv">completion</span><span class="p">:</span> <span class="p">((</span><span class="kt"><a href="../Enums/WriteResult.html">WriteResult</a></span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kt">Void</span><span class="p">)?</span> <span class="o">=</span> <span class="kc">nil</span><span class="p">)</span></code></pre>

                       