swift - Swift で NSTextField から NSImage を取得する

Question

私は、次のように Obj-C から NSTextField のサブクラスで NSImage を取得していました。

  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] ...
  } 

Swift で同じことをしようとすると、キャストできないように見えますattachmentCellが、コンパイラ エラーが発生します。

  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

ネイト・クックに感謝。以下の作品：

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