Swift和Wordpress API：Wordpress API將某些字符轉義為Unicode

Question

我正在復制粘貼Wordpress API返回的2個帖子標題：

Haydarpaşa’da ortaya çıktı! Tam 1700 yıllık…

Pakistan’da terör saldırısı

我為類別/帖子和其他內容創建結構，並使它們可解碼，但這些結構不處理Unicode。 這是一個例子。 我為類別創建的結構。 （帖子的結構太大，因此我共享類別結構。它們都基於相同的思想。）

struct WPCategory: Decodable {

  let id: Int
  let count: Int
  let description: String
  let link: URL
  let name: String
  let slug: String
  let taxonomy: WPCategoryTaxonomy
  let parent: Int

  enum WPCategoryTaxonomy: String, Codable {
    case category, postTag = "post_tag", navMenu = "nav_menu", linkCategory = "link_category", postFormat = "post_format"
  }

  enum CodingKeys: String, CodingKey {
    case id, count, description, link, name, slug, taxonomy, parent, meta
  }

  init(from decoder: Decoder) throws {
    let container = try decoder.container(keyedBy: CodingKeys.self)

    id = try container.decode(Int.self, forKey: .id)
    count = try container.decode(Int.self, forKey: .count)
    description = try container.decode(String.self, forKey: .description)
    let linkString  = try container.decode(String.self, forKey: .link)
    guard let link = URL.init(string: linkString) else {
      throw WPAPIError.urlToStringFailed
    }
    self.link = link
    name = try container.decode(String.self, forKey: .name)
    slug = try container.decode(String.self, forKey: .slug)
    taxonomy = try container.decode(WPCategoryTaxonomy.self, forKey: .taxonomy)
    parent = try container.decode(Int.self, forKey: .parent)
  }
}

我正在使用Alamofire來獲取數據：

  func getCategories(page: Int = 1, onCompletion completionHandler: @escaping (_ categories: [WPCategory]?, _ totalPages: Int?, _ error: Error?) -> Void) {
    let request = alamofire.request(categoriesURL, method: .get, parameters: ["page": page, "per_page": 100, "exclude":"117"], encoding: URLEncoding.httpBody).validate()
    request.responseData  { (response) in
      switch response.result {
      case .success(let result):
        guard let total = response.response?.allHeaderFields["x-wp-totalpages"] as? String else {
          completionHandler(nil, nil, WPAPIError.couldNotFetchTotalHeader)
          return
        }

        do {
          let categories = try JSONDecoder.init().decode([WPCategory].self, from: result)
          completionHandler(categories, Int(total), nil)
        } catch(let err) {
          completionHandler(nil, nil, err)
        }

      case .failure(let error):
        completionHandler(nil, nil, error)
      }
    }
  }

那么，如何處理這些Unicode字符？ 有任何想法嗎？ 謝謝。

Answer 1

使用我為此編寫的擴展名：

extension String {
    func htmlDocument() throws -> String {
        let data = self.data(using: .unicode)
        let options: [NSAttributedString.DocumentReadingOptionKey: NSAttributedString.DocumentType] = [.documentType : .html]
        return try NSAttributedString(data: data!, options: options, documentAttributes: nil).string
    }
}

因此，您可以在解碼器中使用它，例如：

...
        name = try container.decode(String.self, forKey: .name).htmlDocument()
...

Answer 2

根據@OOper建議，最好在使用unicode的情況下更新標題和文本。 swift字符串基於unicode，請參考下面的文檔鏈接，該文檔證明了swift標准庫或Apple的框架正確處理了unicode。 因此您提到的標題沒有意義… ’ … ’ 這些是數字字符引用，而不是unicode char。

https://docs.swift.org/swift-book/LanguageGuide/StringsAndCharacters.html

Answer 3

如果您需要在Swift中處理這樣的轉義字符串，可以將其轉換為普通的 Unicode字符串。

因此，如果在Swift游樂場中輸入以下代碼：

import Foundation


func convert(escapedString: String) -> String {
    guard let regex = try? NSRegularExpression(pattern: "(&#([0-9]+);)",
                                               options: []) else { return escapedString }

    let escapedNSString = escapedString as NSString
    let matches: [NSTextCheckingResult] = regex.matches(in: escapedString,
                                                        options: [],
                                                        range: NSMakeRange(0, escapedString.count))
    var convertedString = escapedNSString

    for match in matches.reversed() {
        let matchString = escapedNSString.substring(with: match.range(at: 2))
        var replacement: String
        if let unicode = UnicodeScalar(Int(matchString)!) {
            replacement = String(unicode)
        } else {
            replacement = "?"
        }
        convertedString = convertedString.replacingCharacters(in: match.range, with: replacement) as NSString
    }
    return String(convertedString)
}


let str1 = "Haydarpaşa’da ortaya çıktı! Tam 1700 yıllık…"
print (convert(escapedString: str1))
let str2 = "Pakistan’da terör saldırısı"
print (convert(escapedString: str2))

這樣您將得到結果：

Haydarpaşa’da ortaya çıktı! Tam 1700 yıllık…
Pakistan’da terör saldırısı