title: Swift 3.0 converting error
body: <p>I have a Swift 2.2 project.
  Now I'm trying to convert it to Swift 3.0 but get error.</p>
  
  <p>Swift 2.2 :</p>
  
  <pre><code>import QuartzCore.QuartzCore
  </code></pre>
  
  <p>but this code occurs error.</p>
  
  <p>Swift 3.0 error:</p>
  
  <pre><code>No such module 'QuartzCore.QuartzCore'
  </code></pre>
  
  <p>Why this error occur and how to fix this error?</p>