lternate mode, e.g. with a colored background or foreground. Depends on the IVI system.</p>

<p>Optional</p>

  
  
  <h4>Objective-C</h4>
  <pre class="highlight objective_c"><code><span class="k">@property</span> <span class="p">(</span><span class="n">nonatomic</span><span class="p">,</span> <span class="n">strong</span><span class="p">,</span> <span class="n">nullable</span><span class="p">)</span> <span class="n">NSNumber</span><span class="o">&lt;</span><span class="n"><a href="../Protocols.html#/c:ob