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我有一个复杂的长 XHTML 文件，其中包含 CSS。在谷歌和这个网站上搜索，我发现了一些对 XHTML 解析有用的库：

  • NSXML解析器
  • TBXML
  • 还有一些其他的

但是，我想知道是否有任何 iPhone 库可以将 xhtml + css 文档转换为NSAttributedString（当然只有文本）。

我一直在思考这个问题，也有过一些想法，但我觉得效率不会很高。我的主要思想是由以下步骤形成的：

  • 在 XTHML 文件上检测所有带有idorclass属性的标签，并获取它们有效的字符串范围（我无法实现这一点）。

  • 将所有 CSS 属性保存在 a 上NSDictionary，其中包含更多NSDictionary对象。像这样的东西：

    mainDict {
    object: dictionary {
         object: @"#00ff00"
         key: @"color"
         object: @"1em"
         key: @"font-size"
    }
    key: @"a id"
    object: anotherDictionary {
        ...
    }
    key: @"another id"
}

  • 在属性字典上转换这些 CSS 属性NSAttributedString字典。

我知道这很复杂，我不需要你提供代码（当然，如果你提供它会很棒），我只想要一个库的链接，或者，如果它不存在，一些关于自己创建解析器的建议。

当然，如果您需要更多信息，请通过评论询问。

谢谢！！

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2 回答 2

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It depends on your needs if this will do what you want, but DTCoreText has an HTML -> NSAttributedString converter. It's very specific for what DTCoreText wants to / needs to do, but it might at least point you in the right direction.

于 2012-06-03T10:36:19.853 回答
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我将 HTML 字符串解析为 NSAttributedString 的方法是将解析后的节点（及其子节点）递归地追加到 NSMutableAttributedString 中。

我还没有准备好在任何地方发布我的完整代码。但希望这可以给你一些提示......

NSString+HTML.h

/*  - toHTMLElements
 *  parse the string itself into a dictionary collection of htmlelements for following keys
 *  : @"attributedString"   // html main body
 *  : @"insets"         // images and/or videos with range info
 *  : @"as"             // href with range info
 *  
 */

- (NSMutableDictionary*) toHTMLElements;

NSString+HTML.m

- (NSMutableDictionary*) toHTMLElements {

    // …
    // handle escape encoding here
    // assume that NSString* htmlString is the processed string;
    // …


    NSMutableDictionary * htmlElements = [[NSMutableDictionary dictionary] retain];

    NSMutableAttributedString * attributedString = [[[NSMutableAttributedString alloc] init] autorelease];
    NSMutableArray * insets = [NSMutableArray array];
    NSMutableArray * as     = [NSMutableArray array];

    [htmlElements setObject:attributedString forKey:HTML_ATTRIBUTEDSTRING];
    [htmlElements setObject:insets forKey:HTML_INSETS];
    [htmlElements setObject:as forKey:HTML_AS];


    // parse the HTML with an XML parser
    // CXXML is a variance of TBXML (http://www.tbxml.co.uk/ ) which can handle the inline tags such as <span>
    // code not available to public yet, so write your own inline-tag-enabled HTML/XML parser.

    CXXML * xml = [CXXML tbxmlWithXMLString:htmlString];
    TBXMLElement * root = xml.rootXMLElement;

    TBXMLElement * next = root->firstChild;

    while (next != nil) {
        //
        // do something here for special treatments if needed
        //
        NSString * tagName = [CXXML elementName:next];

        [self appendXMLElement:next withAttributes:[HTMLElementAttributes defaultAttributesFor:tagName] toHTMLElements:htmlElements];

        next = next->nextSibling;
    }

    return [htmlElements autorelease];
}

- (void) appendXMLElement:(TBXMLElement*)aElement withAttributes:(NSDictionary*)parentAttributes toHTMLElements:(NSMutableDictionary*) htmlElements {

    // do your parse of aElement and its attribute values, 
    // assume NSString * tagAttrString is the parsed html attribute string (either from "style" attribute or css file) for this tag like : width:200px; color:#123456; 
    // let an external HTMLElementAttributes class to handle the attribute updates from the parent node's attributes

    NSDictionary * tagAttr = [HTMLElementAttributes updateAttributes: parentAttributes withCSSAttributes:tagAttrString];

    // create your NSAttributedString styled by tagAttr
    // create insets such as images / videos or hyper links objects
    // then update the htmlElements for storage

    // once this tag is handled, recursively visit and process the current tag's children

    TBXMLElement * nextChild = aElement->firstChild;

    while (nextChild != nil) {
        [self appendXMLElement:nextChild withAttributes:tagAttr toHTMLElements:htmlElements];
        nextChild = nextChild->nextSibling;
    }
}
于 2012-06-04T10:14:58.873 回答