title: Get integer value from string in swift
body: <p>So I can do this:</p>
  
  <pre><code>var stringNumb: NSString = "1357"
  
  var someNumb: CInt = stringNumb.intValue
  </code></pre>
  
  <p>But I can't find the way to do it w/ a <code>String</code>.  I'd like to do something like:</p>
  
  <pre><code>var stringNumb: String = "1357"
  
  var someNumb: Int = Int(stringNumb)
  </code></pre>
  
  <p>This doesn't work either:</p>
  
  <pre><code>var someNumbAlt: Int = myString.integerValue
  </code></pre>