title: how to pass array to NSNotification in swift
body: <p>i have the following code which print the url of updated image </p>
  
  <pre><code>override func viewWillAppear(animated: Bool) {
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "assetChange:", name: ALAssetsLibraryChangedNotification, object: nil) }
  
  
  func assetChange(notification: NSNotification){
  
    if var info:NSDictionary = notification.userInfo { var url:NSSet = info.objectForKey(ALAssetLibraryUpdatedAssetsKey) as NSSet
        var aurl:NSURL = url.anyObject() as NSURL
          println(aurl)
  
       }
  
  }
  </code></pre>
  
  <p>this code work fine but it will print only first modified image url,but i want all the list of modified image url(array of modified images) please help me</p>