Как использовать NSDocument для хранения изображений

Question

Как я могу использовать NSDocument для программной обработки изображений в программе Swift iOS?

let alertController = UIAlertController(title: "Choose an option", message: "", preferredStyle: .Alert) 

    let cameraRollAction = UIAlertAction(title: "Camera Roll", style: .Default) { (action) in 
     self.imagePicker.delegate = self 
     self.imagePicker.sourceType = UIImagePickerControllerSourceType.SavedPhotosAlbum; 
     self.imagePicker.allowsEditing = true 
     self.presentViewController(self.imagePicker, animated: true, completion: nil) 

    } 
    alertController.addAction(cameraRollAction) 

    let takePictureAction = UIAlertAction(title: "Take a picture", style: .Default) { (action) in 
     self.imagePicker.delegate = self 
     self.imagePicker.allowsEditing = true 
     self.imagePicker.sourceType = UIImagePickerControllerSourceType.Camera 
     self.imagePicker.cameraCaptureMode = .Photo 
     self.imagePicker.modalPresentationStyle = .FullScreen 
     self.presentViewController(self.imagePicker, 
      animated: true, 
      completion: nil) 
    } 

Мне нужно сохранить изображения при выборе кнопки и получить их при необходимости.

Answer 1

реализации делегата UIImagePickerControllerDelegate

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) { 

let image = info[UIImagePickerControllerOriginalImage] as? UIImage 
let imageData = UIImagePNGRepresentation(image!) 
let dirPaths = NSSearchPathForDirectoriesInDomains(
    .DocumentDirectory, .UserDomainMask, true)[0] as NSString 

    let fullPath = dirPaths.stringByAppendingPathComponent("yourNameImg.png") 
    let result = imageData.writeToFile(fullPath, atomically: true) 
    dismissViewControllerAnimated(true, completion: nil) 

}