title: "Ambiguous use" in Xcode 10, Swift 4.2
body: <p>I am using a library <a href="https://github.com/AssistoLab/DropDown" rel="nofollow noreferrer">DropDown</a> which is a Material Design drop down for <code>iOS</code> written in <code>Swift</code>.</p>
  
  <p>I am setting <code>cornerRadius</code> of the view like below as DropDown is a subclass of <code>UIView</code>. </p>
  
  <pre><code>let dropDown = DropDown()
  dropDown.cornerRadius = 10
  </code></pre>
  
  <p>It was working fine in <code>Xcode 9.4</code> but after upgrading to <code>Xcode 10</code> it is giving the error below: </p>
  
  <blockquote>
    <p>Ambiguous use of cornerRadius</p>
  </blockquote>
  
  <p>what can be the issue? </p>