title: Change width of a UIBarButtonItem in a UINavigationBar in swift
body: <p>i need to set frame for my navigation bar button in swift 2.0</p>
  
  <p>i tried this code</p>
  
  <pre><code>self.navigationController!.navigationBar.drawRect(CGRectMake(0, 0, 30, 30)) 
  </code></pre>
  
  <p>but it won't work </p>
  
  <p>thanks in advance</p>