사진 exif data 중 날짜정보 불러오기

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.
        }
    }
 
    @IBOutlet weak var test_label: NSTextField!
    @IBAction func choosingFile(sender: AnyObject) {
        let openPanel = NSOpenPanel()
        /*
        openPanel.allowedFileTypes = ["css","html","pdf","png"]
        openPanel.canChooseDirectories = true
        openPanel.resolvesAliases = true
        openPanel.allowsMultipleSelection = true
        */
        openPanel.title = "Choose a file"
        openPanel.beginWithCompletionHandler({(result:Int) in
            if(result == NSFileHandlingPanelOKButton)
            {
                let fileURL = openPanel.URL!
                //print(fileURL)
                //do something with the selected file. Its url = fileURL
                
                //added by morrow
                
                let imageSource = CGImageSourceCreateWithURL(fileURL, nil)
                
                let imageProperties = CGImageSourceCopyPropertiesAtIndex(imageSource!, 0, nil)! as NSDictionary;
                
                let exifDict = imageProperties.valueForKey("{Exif}")  as! NSDictionary;
                let dateTimeOriginal = exifDict.valueForKey("DateTimeOriginal") as! NSString;
                 
                
                self.test_label.stringValue = dateTimeOriginal as String
                
                
               
            }
        })
    }
 
}
 
 
 

최종목표는  파이썬에서 처럼  폴더전체를 읽고와서 각각의 사진을 날짜폴더별로 분류하는 것입니다.  사실 파이썬에 완성된 코드가 있어서 그것으로 작업을 하면 되지만 swift를 뱅는 입장인지라 한번 해보고 싶어서 시작한 작업입니다.