In Swift 2.3 I've used this code, but after updating Swift to version 3.0 my code can't compile. Thank you!
var waterfallLibrary: NSArray = []
cell!.textLabel?.text = String(self.waterfallLibrary.valueForKey("songName").objectAtIndex(indexPath.row))
My problem solved with this code
(waterfallLibrary.value(forKey: "songName") as! NSArray).object(at: indexPath.row)
Thank you Leo Dabus!