Получите NSImage из NSTextField в Swift

Question

Я использовал для получения NSImage в подклассе NSTextField из Obj-C следующим образом:

  NSDictionary *attributedVal = [[self attributedStringValue] attributesAtIndex:i effectiveRange:&effectiveRange];
  if ([[attributedVal allKeys] containsObject:NSAttachmentAttributeName]) {
    NSTextAttachment *attachment = [attributedVal valueForKey:NSAttachmentAttributeName];
    NSCell *attachmentCell = (NSCell *)[attachment attachmentCell];
    ... [[attachmentCell image] name] ...
  } 

Когда я пытаюсь сделать то же самое в Swift, я не могу разыграть attachmentCell но получите ошибку компилятора:

  let attributedVal = attributedStringValue.attributesAtIndex(i, effectiveRange: effectiveRange)
  if let attachment = attributedVal[NSAttachmentAttributeName] as? NSTextAttachment {
    let attachmentCell = attachment.attachmentCell as NSCell // does not work
    ...
  }

Answer 1

Спасибо Нейту Кук. Следующие работы:

  let attributedVal = attributedStringValue.attributesAtIndex(i, effectiveRange: effectiveRange)
  if let attachment = attributedVal[NSAttachmentAttributeName] as? NSTextAttachment {
    let attachmentCell = attachment.attachmentCell as NSTextAttachmentCell
    let image = attachmentCell.image
    ...
  }