如何可靠地转换特殊字符，例如 £使用 Cocoa 转换成 HTML 等价物？

发布于 2024-12-02 06:28:39 字数 1683 浏览 2 评论 0原文

我正在尝试向 Mail.app 提供一些简单的 html：列表、粗体字体、一些斜体。但是，我注意到，如果我使用像 £ 这样的字符，那么 Mail.app 就不会显示任何内容。我意识到我需要转换为 HTML 实体，例如 £ （此处的完整列表：http://www.w3schools.com/tags/ref_entities.asp）。我有一个适用于我的用户提出的大多数字符的部分解决方案，但它远不是一个可靠的解决方案：

- (NSString*) makeValidHTML:(NSString*)str {
  str = [str stringByReplacingOccurrencesOfString:@"£" withString:@"&pound;"];
  str = [str stringByReplacingOccurrencesOfString:@"¢" withString:@"&cent;"];
  str = [str stringByReplacingOccurrencesOfString:@"¥" withString:@"&yen;"];
  str = [str stringByReplacingOccurrencesOfString:@"©" withString:@"&copy;"];
  str = [str stringByReplacingOccurrencesOfString:@"®" withString:@"&reg;"];
  str = [str stringByReplacingOccurrencesOfString:@"°" withString:@"&deg;"];
  str = [str stringByReplacingOccurrencesOfString:@"¿" withString:@"&iquest;"];
  str = [str stringByReplacingOccurrencesOfString:@"¡" withString:@"&iexcl;"];
  str = [str stringByReplacingOccurrencesOfString:@"‘" withString:@"'"];
  str = [str stringByReplacingOccurrencesOfString:@"'" withString:@"'"];
  str = [str stringByReplacingOccurrencesOfString:@"&" withString:@"&amp;"];
  str = [str stringByReplacingOccurrencesOfString:@"\"" withString:@"&quot;"];
  str = [str stringByReplacingOccurrencesOfString:@"“" withString:@"&quot;"];
  str = [str stringByReplacingOccurrencesOfString:@"<" withString:@"&lt;"];
  str = [str stringByReplacingOccurrencesOfString:@">" withString:@"&gt;"];
  return str;
}

是否有一种标准方法可以做到这一点，而不必列出每个可能的保留字符？

原文

I'm trying to feed Mail.app some simple html: lists, bold font, some italics. However, I noticed that if I use characters like £, then Mail.app just doesn't show anything. I realized I need to convert to HTML entities, like £ (full list here: http://www.w3schools.com/tags/ref_entities.asp). I have a partial solution that works for most characters my users have come up with, but it's far from being a solid fix:

- (NSString*) makeValidHTML:(NSString*)str {
  str = [str stringByReplacingOccurrencesOfString:@"£" withString:@"£"];
  str = [str stringByReplacingOccurrencesOfString:@"¢" withString:@"¢"];
  str = [str stringByReplacingOccurrencesOfString:@"¥" withString:@"¥"];
  str = [str stringByReplacingOccurrencesOfString:@"©" withString:@"©"];
  str = [str stringByReplacingOccurrencesOfString:@"®" withString:@"®"];
  str = [str stringByReplacingOccurrencesOfString:@"°" withString:@"°"];
  str = [str stringByReplacingOccurrencesOfString:@"¿" withString:@"¿"];
  str = [str stringByReplacingOccurrencesOfString:@"¡" withString:@"¡"];
  str = [str stringByReplacingOccurrencesOfString:@"‘" withString:@"'"];
  str = [str stringByReplacingOccurrencesOfString:@"'" withString:@"'"];
  str = [str stringByReplacingOccurrencesOfString:@"&" withString:@"&"];
  str = [str stringByReplacingOccurrencesOfString:@"\"" withString:@"""];
  str = [str stringByReplacingOccurrencesOfString:@"“" withString:@"""];
  str = [str stringByReplacingOccurrencesOfString:@"<" withString:@"<"];
  str = [str stringByReplacingOccurrencesOfString:@">" withString:@">"];
  return str;
}

Is there a standard way to do this without having to list every possible reserved character?

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

素染倾城色 2024-12-09 06:28:39

本课程应该对您有帮助：
https://github.com/mwaterfall/MWFeedParser/blob/ master/Classes/NSString+HTML.m

从另一个 SO 答案中检索到的链接：
转换到&在 Objective-C 中

回复收藏 0 原文

中性美 2024-12-09 06:28:39

我认为您的主要问题是您没有将 HTML 页面编码并声明为 UTF-8。虽然您提到的一些实体是一个真正的问题，需要转换，例如 > 到 > （@Joel Martinez 链接的代码将有所帮助那里），像 £ 符号这样的东西就可以正常工作，只要页面被声明并编码为 unicode 格式，例如 UTF-8：