如何从NSAttributedString

时间:2016-12-01 07:15:29

标签: cocoa nsattributedstring nstextattachment

我有一个Mac应用程序,它读取格式化的文本,图像存储为NSAttributedString。我想将其转换为HTML,包括图像。

获取HTML工作正常,我甚至可以枚举附加的图像,但我无法获得附加图像的实际文件名。我需要那些用于生成的HTML。

获取HTML:

let htmlData = try attrString.dataFromRange(NSMakeRange(0, attrString.length), 
documentAttributes: [NSDocumentTypeDocumentAttribute:NSHTMLTextDocumentType])

产生

<p class="p1"><img src="file:///Untitled%202.jpg" alt="Untitled 2.jpg"></p>

枚举所附图像:

    attrString.enumerateAttribute(NSAttachmentAttributeName,
        inRange: NSMakeRange(0, attrString.length),
        options: [],
        usingBlock: {attachment, range, _ in

        if let attachment = attachment as? NSTextAttachment,
            let fileWrapper = attachment.fileWrapper,
            let data = fileWrapper.regularFileContents
        {
            // This prints <NSTextAttachment: 0x7fe68d5304c0> "Untitled 2.jpg"
            // But there's no API to get the name?
            print(attachment.description)
        }
    })

所以我最终得到NSTextAttachment个实例,但无法确定实际的文件名(&#34; Untitled 2.jpg&#34;)。 NSFileWrapper.filename返回nil,但我没有看到用于从文字附件中获取名称的API。

令人沮丧的是,信息在文本附件中。如果我打印其调试说明,我会看到文件名:

<NSTextAttachment: 0x7fe68d5304c0> "Untitled 2.jpg"
<NSTextAttachment: 0x7fe68d533d60> "Pasted Graphic.tiff"

如何访问文件名? (不解析调试描述;)

1 个答案:

答案 0 :(得分:0)

NSTextAttachment没有图片名称和图片网址的属性,这绝对是荒谬的。

我将NSTextAttachment子类化,并在初始化自定义类时添加了这些属性。

例如:

子类:

import Foundation

class CustomTextAttachment: NSTextAttachment {

    var imageURL: String?
    var imageTitle: String?

}

实现:

let textAttachment = CustomTextAttachment()
textAttachment.imageTitle = title
textAttachment.imageURL = url

现在,当我点按图片时:

func textView(_ textView: UITextView, shouldInteractWith textAttachment: NSTextAttachment, in characterRange: NSRange) -> Bool {

    print("Tapped custom text attachment")

    if let commentTextAttachment = textAttachment as? CustomTextAttachment, let title = commentTextAttachment.imageTitle, let link = commentTextAttachment.imageURL {
         print("Got title \(title) and link \(link) for attachment")
    }

    return true
}