在Swift中将HTML转换为纯文本 [英] Convert HTML to Plain Text in Swift

问题描述

我正在开发一个简单的RSS阅读器应用程序作为Xcode中的初学者项目。我目前设置它解析feed，并放置标题，发布日期，描述和内容，并将其显示在WebView中。

I'm working on a simple RSS Reader app as a beginner project in Xcode. I currently have it set up that it parses the feed, and places the title, pub date, description and content and displays it in a WebView.

我最近决定显示用于选择帖子的TableView中的描述（或内容的截断版本）。但是，这样做时：

I recently decided to show the description (or a truncated version of the content) in the TableView used to select a post. However, when doing so:

cell.textLabel?.text = item.title?.uppercaseString
cell.detailTextLabel?.text = item.itemDescription //.itemDescription is a String

它显示了原始的HTML发布。

It shows the raw HTML of the post.

我想知道如何将HTML转换为纯文本，仅用于TableView的详细UILabel。

I would like to know how to convert the HTML into plain text for just the TableView's detailed UILabel.

谢谢！

推荐答案

您可以添加此扩展名以将您的html代码转换为常规字符串：

You can add this extension to convert your html code to a regular string:

编辑/更新：

讨论不应从后台调用HTML导入器
thread（即，options字典包含带有
值的html的documentType）。它将尝试与主线程同步，失败，
和超时。从主线程调用它可以工作（但如果HTML包含对外部资源的引用，仍然可以
超时，应该不惜一切代价避免
）。 HTML导入机制意味着
用于实现markdown（即文本样式，
颜色等），而不是一般的HTML导入。

Discussion The HTML importer should not be called from a background thread (that is, the options dictionary includes documentType with a value of html). It will try to synchronize with the main thread, fail, and time out. Calling it from the main thread works (but can still time out if the HTML contains references to external resources, which should be avoided at all costs). The HTML import mechanism is meant for implementing something like markdown (that is, text styles, colors, and so on), not for general HTML import.

Xcode 9•Swift 4

extension Data {
    var html2AttributedString: NSAttributedString? {
        do {
            return try NSAttributedString(data: self, options: [.documentType: NSAttributedString.DocumentType.html, .characterEncoding: String.Encoding.utf8.rawValue], documentAttributes: nil)
        } catch {
            print("error:", error)
            return  nil
        }
    }
    var html2String: String {
        return html2AttributedString?.string ?? ""
    }
}

extension String {
    var html2AttributedString: NSAttributedString? {
        return Data(utf8).html2AttributedString
    }
    var html2String: String {
        return html2AttributedString?.string ?? ""
    }
}

---

Xcode 8.3•Swift 3.1

extension String {
    var html2AttributedString: NSAttributedString? {
        do {
            return try NSAttributedString(data: Data(utf8), options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType, NSCharacterEncodingDocumentAttribute: String.Encoding.utf8.rawValue], documentAttributes: nil)
        } catch {
            print("error:", error)
            return nil
        }
    }
    var html2String: String {
        return html2AttributedString?.string ?? ""
    }
}

---

---

cell.detailTextLabel?.text = item.itemDescription.html2String

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