notes

default:
-   fatalError("Unexpected Segue identifier; \(segue.identifier)")
+   fatalError("Unexpected Segue identifier; \(String(describing: segue.identifier))")

default:
-   fatalError("Unexpected Segue identifier; \(segue.identifier)")
+   fatalError("Unexpected Segue identifier; \(String(describing: segue.identifier))")

    //MARK: Actions
    @IBAction func unwindToMealList(sender: UIStoryboardSegue) {
-        if let sourceViewContoller = sender.sourceViewController as? MealViewController, let meal = sourceViewContoller.meal {
+        if let sourceViewContoller = sender.source as? MealViewController, let meal = sourceViewContoller.meal {
            // Add new meal.
            let newIndexPath = IndexPath(row: meals.count, section: 0)
            meals.append(meal)
            tableView.insertRows(at: [newIndexPath], with: .automatic)
        }
    }

    //MARK: Actions
    @IBAction func unwindToMealList(sender: UIStoryboardSegue) {
-        if let sourceViewContoller = sender.sourceViewController as? MealViewController, let meal = sourceViewContoller.meal {
+        if let sourceViewContoller = sender.source as? MealViewController, let meal = sourceViewContoller.meal {
            // Add new meal.
            let newIndexPath = IndexPath(row: meals.count, section: 0)
            meals.append(meal)
            tableView.insertRows(at: [newIndexPath], with: .automatic)
        }
    }

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {

        // The info dictionary may contain multiple representations of the image. You want to use the original.
-        guard let selectedImage = info[UIImagePickerControllerOriginalImage] as? UIImage else {
+        guard let selectedImage = info[.originalImage] as? UIImage else {
            fatalError("Expected a dictionary containing as image, but was provided the following: \(info)")
        }

        // Set photoImageView to display the selected image.
        photoImageView.image = selectedImage

        // Dismiss the picker.
        dismiss(animated: true, completion: nil)
    }

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {

        // The info dictionary may contain multiple representations of the image. You want to use the original.
-        guard let selectedImage = info[UIImagePickerControllerOriginalImage] as? UIImage else {
+        guard let selectedImage = info[.originalImage] as? UIImage else {
            fatalError("Expected a dictionary containing as image, but was provided the following: \(info)")
        }

        // Set photoImageView to display the selected image.
        photoImageView.image = selectedImage

        // Dismiss the picker.
        dismiss(animated: true, completion: nil)
    }