title: can not add item to NSMutableDictionary in swift iOS
body: <p>I want to add the following items to a NSMutableDictionary but I get the following error</p>
  
  <pre><code>could not find an overload for setObject that accepts the following arguments
  
  
  import Security
  
  var returnDictionary = NSMutableDictionary()
  
  returnDictionary.setObject(anObject: kSecClassGenericPassword, forKey: kSecClass)
  </code></pre>
  
  <p>when I browse to security.h file, the attributes are shown to be declared as below:</p>
  
  <pre><code>var kSecClass: Unmanaged&lt;AnyObject&gt;!
  var kSecClassGenericPassword: Unmanaged&lt;AnyObject&gt;!
  </code></pre>