title: How to call private class function from selector in Swift.?
body: <p>Currently i'm doing like this,</p>
  
  <p>Calling selector as:</p>
  
  <pre><code>NSTimer.scheduledTimerWithTimeInterval(0.5, target: self, selector: "startAnimation:", userInfo: loadingView, repeats: true)
  </code></pre>
  
  <p>Selector method is as: </p>
  
  <pre><code>private class func startAnimation(timer:NSTimer){
      var loadingCircularView = timer.userInfo as UIView
  }
  </code></pre>
  
  <p>I'm getting warning, and app crashes:</p>
  
  <pre><code>warning: object 0x67c98 of class ‘ClassName’ does not implement methodSignatureForSelector: -- trouble ahead Unrecognized selector +[ClassName startAnimation:]
  </code></pre>