title: Why will React Native Picker not display on iOS?
body: <p>I am trying to use the  element in React Native. It works fine on Android but is not displaying on iOS.</p>
  
  <pre><code>&lt;Picker selectedValue={'java'} &gt;
    &lt;Picker.Item label="Java" value="java" /&gt;
    &lt;Picker.Item label="JavaScript" value="js" /&gt;
  &lt;/Picker&gt;
  </code></pre>