bleViewController</span><span class="p">(</span><span class="n">_</span> <span class="nv">rootViewController</span><span class="p">:</span> <span class="kt">UIViewController</span><span class="p">?</span> <span class="o">=</span> <span class="kt">UIApplication</span><span class="o">.</span><span class="n">shared</span><span class="o">.</span><span class="n">keyWindow</span><span class="p">?</span><span class="o">.</span><span class="n">rootViewController</span><span class="p">)</span> <span class="o">-&gt;<