從獲取的NSTextField NSImage中斯威夫特

Question

我用來檢索NSImage中從對象 - 這樣的NSTextField的一個子類：

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] ... 
    } 

當我嘗試做相同的斯威夫特我似乎無法成爲能夠鑄attachmentCell，但得到一個編譯器錯誤：

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

感謝內特庫克。以下作品：

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