iphone，如何获得这个标签？

Question

<div>
  <p>
    <a href="#" class="transcriptLink" onclick="seekVideo(0); return false;">A few years ago,</a>
    <a href="#" class="transcriptLink" onclick="seekVideo(2000); return false;">I felt like I was stuck in a rut,</a>
    <a href="#" class="transcriptLink" onclick="seekVideo(5000); return false;">so I decided to follow in the footsteps</a>
    <a href="#" class="transcriptLink" onclick="seekVideo(7000); return false;">of the great American philosopher, Morgan Spurlock,</a>
    <a href="#" class="transcriptLink" onclick="seekVideo(10000); return false;">and try something new for 30 days.</a>
  </p>
</div>

这是网页代码的一部分。

我想知道如何获取 label 中的文本。如：“几年前”

我可以在"<a> text </a>", 中获取文本

但我不知道如何在"<a href="#" class="transcriptLink" onclick="seekVideo(0); return false;">A few years ago,</a> " 标签中获得“几年前”

<a href="#" class="transcriptLink" onclick="seekVideo(0); return false;">  
<a href="#" class="transcriptLink" onclick="seekVideo(2000); return false;">
....................

只有onclick="seekVideo(....);不同

/div/p/a[substring-before(substring-after(@onclick, '('), ')') = '0']/text()

可以得到"A few years ago";之类的文字

但现在我想获取seekVideo(number)中的号码？？？？

/div/p/a[number(substring-before(substring-after(@onclick, '('), ')'))]

不对！！！

例如：<a href="#" class="transcriptLink" onclick="seekVideo(2000); return false;">

我想得到“2000”，怎么办？

示例项目或代码更好，谢谢

Answer 1

如果它是有效的 XML（从您向我们展示的示例中它是有效的 XML），您可以使用 NSXMLParser 进行解析。

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
    if(!currentString){
        currentString = [[NSMutableString alloc] init];
    }
    [currentString appendString:string];    
}

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {
    if([elementName isEqualToString:@"a"]){
        NSLog(@"Text betweeen \"a\" tag %@",currentString);
    }
    [currentString release],currentString =nil;
}

要从 seekVideo(0) 中获取 0，请使用

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict{
    if([elementName isEqualToString:@"a"]){
        NSString* onClickAttribString = [attributeDict objectForKey:@"onclick"];
        NSLog(@"OnClick Attrib: %@",onClickAttribString);
        // seekVideo(0); return false; 
        NSArray* arrayList = [onClickAttribString componentsSeparatedByString:@" "]; // gives array of string seperated by space
        NSLog(@"seekvideo %@",[arrayList objectAtIndex:0]);
        //Process seekvideo(0); to get number... use NSScanner
        NSString* seekVideoString = [arrayList objectAtIndex:0];
        NSString* numberString = [seekVideoString stringByTrimmingCharactersInSet:[[NSCharacterSet decimalDigitCharacterSet] invertedSet]];
        NSLog(@"Number : %@",numberString);
        // if you want numberString converted to integer then [numberString intValue]
    }
}