title: Flutter Material to Cupertino transformation issues
body: <p>I am working on a project which is almost 80% done. All my project is done on Material design. Now I am trying to move Cupertino UI theme for Android and IOS both.</p>
  
  <p>As I am trying to migrate from Material design to Cupertino UI I am facing lots of problems especially in the below areas..</p>
  
  <blockquote>
    <ol>
    <li><strong>TextFormField</strong>: I am not able to find <strong>TextFormField</strong> in Cupertino design to use with forms...</li>
    <li><strong>Validator</strong>: How to valide <strong>CupertinoTextField</strong> as there is no validator method</li>
    <li>App Drawer: Right now I have App Drawer. As I am moving to Cuprtino UI design for both IOS and Android should I drop the App Drawer?</li>
    <li>How can I give the width of the CupertinoButton ?</li>
    <li>ListTitle is throwing exception when I am trying to migrate to Cuprtio. The exception is "The specific widget that could not find a Material ancestor was: ListTitle"</li>
    </ol>
  </blockquote>
  
  <p>Also, How can I mix a non Cuprtino widget on inside CupertinoPageScaffold page?</p>
  
  <p>Thanks for your time</p>