Parse HTML iPhone_问答_开发者_运维开发者技术经验分享

开发者 https://www.devze.com 2023-03-14 01:19 出处：网络

I have a .html file on a server, which I need to parse info from. It´s nothing huge it´s just <html>

I have a .html file on a server, which I need to parse info from. It´s nothing huge it´s just

<html>
<body>

<p> some text </p>
<p> some other text </p>

</body>
</html>

Is there a way I can put the text in all the <p> tags in an array as separate objects, so I can show 开发者_JAVA技巧them in a UITableView?

You can parse it with libxml, here is a sample I wrote it for you:

#import <Foundation/Foundation.h>
#import <libxml/HTMLTree.h>
#import <libxml/HTMLparser.h>
#import <libxml/xpath.h>

@interface NSString(HTMLParser)
- (NSArray *)resultWithXPath:(NSString *)xpath;
@end

@implementation NSString(HTMLParser)

- (NSArray *)resultWithXPath:(NSString *)xpath
{
  htmlDocPtr doc = htmlParseDoc((xmlChar *)[[self dataUsingEncoding:NSUTF8StringEncoding] bytes], "UTF-8");
  xmlXPathContextPtr context = xmlXPathNewContext(doc);
  xmlXPathObjectPtr xpathobj = xmlXPathEvalExpression(BAD_CAST [xpath UTF8String], context);
  xmlNodeSetPtr nodeset = xpathobj->nodesetval;
  if (xmlXPathNodeSetIsEmpty(nodeset))
    return nil;

  NSMutableArray *result = [[NSMutableArray alloc] initWithCapacity:nodeset->nodeNr];

  for (int i=0; i<nodeset->nodeNr; i++){
    xmlNodePtr node = nodeset->nodeTab[i];
    [result addObject:[NSString stringWithCString:(char *)xmlNodeGetContent(node) encoding:NSUTF8StringEncoding]];
  }

  xmlXPathFreeObject(xpathobj);
  xmlXPathFreeContext(context);
  xmlFreeDoc(doc);

  return [result autorelease];
}

@end

int main (int argc, const char * argv[])
{
  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

  NSString *html = @"<html>\
  <body>\
  <p> some text </p>\
  <p> some other text </p>\
  </body>\
  </html>";

  NSArray *result = [html resultWithXPath:@"//p"];
  NSLog(@"result: %@", result);
  [pool release];

  return 0;
}

Rather than encourage you to figure out how best to parse the HTML, may I suggest just leaving a static JSON file on your web server instead? There are many JSON parser libraries available for iOS that will allow you to get the data you need.

A side effect from doing this is that you will use less bandwidth in the download, it will be faster to parse, and the resulting code will be less brittle to changes in your data payload.

Use UIwebView in your tableViewCell. Or I suggest use three20 Framework's TTStyleLabel. It will display html properly parsed.