title: How to convert a swift String to CFString
body: <p>How can i create a CFString from a native swift String or NSString in swift</p>
  
  <pre><code>    let path:String = NSBundle.mainBundle().pathForResource(name.stringByDeletingPathExtension, ofType:"pdf")
      let string:CFString = ??? path
      let url:CFURLRef = CFURLCreateWithFileSystemPath(allocator:kCFAllocatorDefault, filePath:string, pathStyle:CFURLPathStyle.CFURLPOSIXPathStyle, isDirectory:false)
  </code></pre>