폴더를 선택하고 폴더안에 있는 파일등을 체크하는 코드 in swift with Cocoa

import Cocoa
 
class ViewController: NSViewController {
 
    override func viewDidLoad() {
        super.viewDidLoad()
 
        // Do any additional setup after loading the view.
    }
 
    override var representedObject: AnyObject? {
        didSet {
        // Update the view, if already loaded.
        }
    }
 
    @IBAction func open(sender: AnyObject) {
        
        var myOpenDialog: NSOpenPanel = NSOpenPanel()
        myOpenDialog.canChooseDirectories = true
        myOpenDialog.runModal()
        
        var path = myOpenDialog.URL?.path
        var fs: NSFileManager = NSFileManager.defaultManager()
        
        if (path != nil) {
            
            var err = NSError?()
            let contents: Array = try! fs.contentsOfDirectoryAtPath(path!)
            
            if !(err != nil) {
                NSLog(contents.description)
                
            }
        }
            }
    
    
}