Iphone 解析器读取标记值两次

我试图解析xml文件，但没有得到合适的解析数据。当我在gdb中得到输出时，我从xml文件中的标记中得到的值是原来的两倍。这是我的密码：

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{            
//NSLog(@"found this element: %@", elementName);
currentElement = [elementName copy];
if ([elementName isEqualToString:@"item"]) {
    // clear out our story item caches...
    //item = [[NSMutableDictionary alloc] init];
    blogtitle = [[NSMutableString alloc] init];
    publishdate = [[NSMutableString alloc] init];
    creator = [[NSMutableString alloc] init];
    category = [[NSMutableString alloc] init];
    description = [[NSMutableString alloc] init];
    content = [[NSMutableString alloc] init];
}}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
//NSLog(@"found characters: %@", string);
// save the characters for the current item...
if ( [currentElement isEqualToString:@"title"]) {
    [blogtitle appendString:string];
    NSLog(@"blogtitle....%@",blogtitle);
}else  if ([currentElement isEqualToString:@"pubDate"]) {
    [publishdate appendString:string];
    NSLog(@"publishdate....%@",publishdate);
}else  if ([currentElement isEqualToString:@"dc:creator"]) {
    [creator appendString:string];
    NSLog(@"creator....%@",creator);
}else  if ([currentElement isEqualToString:@"category"]) {
    [category appendString:string];
    NSLog(@"category....%@",category);
} if ([currentElement isEqualToString:@"description"]) {
    [description appendString:string];
    NSLog(@"description....%@",description);
} if ([currentElement isEqualToString:@"content:encoded"]) {
    [content appendString:string];
    NSLog(@"content....%@",content);
}
}


- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{     
//NSLog(@"ended element: %@", elementName);
if ([elementName isEqualToString:@"item"]) {
    // save values to an item, then store that item into the array...
                [item setObject:blogtitle forKey:@"title"];
                [item setObject:publishdate forKey:@"pubDate"];
                [item setObject:creator forKey:@"dc:creator"];
                [item setObject:category forKey:@"category"];
                [item setObject:description forKey:@"description"];
                [item setObject:content forKey:@"content:encoded"];
                [arr addObject:[item copy]];
    //            NSLog(@"adding story: %@", currentTitle);
}

}

以gdb为单位的输出：

2011-08-11 17:32:49.651 the-life-doctor[5282:207] blogtitle....(null)
2011-08-11 17:33:02.897 the-life-doctor[5282:207] blogtitle....(null)
2011-08-11 17:33:07.760 the-life-doctor[5282:207] description....(null)
2011-08-11 17:33:09.217 the-life-doctor[5282:207] description....(null)
2011-08-11 17:33:10.559 the-life-doctor[5282:207] publishdate....(null)
2011-08-11 17:33:11.769 the-life-doctor[5282:207] publishdate....(null)
2011-08-11 17:33:24.104 the-life-doctor[5282:207] blogtitle....WHERE DOES LOVE LIVE
warning: Attempting to create USE_BLOCK_IN_FRAME variable with block that isn't in the        frame.
warning: Attempting to create USE_BLOCK_IN_FRAME variable with block that isn't in the   frame.
2011-08-11 17:35:34.265 the-life-doctor[5282:207] blogtitle....WHERE DOES LOVE LIVE

2011-08-11 17:35:39.053 the-life-doctor[5282:207] publishdate....Mon, 22 Nov 2010   17:43:47 +0000
2011-08-11 17:35:40.146 the-life-doctor[5282:207] publishdate....Mon, 22 Nov 2010 17:43:47 +0000
2011-08-11 17:35:40.644 the-life-doctor[5282:207] creator....admin
2011-08-11 17:35:41.236 the-life-doctor[5282:207] creator....admin

2011-08-11 17:35:41.898生命医生类……爱住在哪里 2011-08-11 17:35:42.341生命医生类……爱住在哪里

这是我的xml文件：

---

我希望从item标签中得到值，即title、pubDate、category等，但每次都会打印两次值。请帮助我。

请查看位于的文档。具体来说，它说-

解析器对象可以向委托发送几个parser:foundCharacters:messages来报告元素的字符。因为字符串可能只是当前元素的全部字符内容的一部分，所以您应该将其附加到当前字符的累加中，直到元素更改为止

因此，根据粗体文本，多个NSLog不是问题。但是，在您的例子中，参数字符串为null（可能是由于解析错误）。仅当字符串为非null时，才应追加该字符串

嗯,

---

Akshay < /P> < P>而不是将内容追加到字符串中，应考虑在-< /P>中设置值

(void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
}

所以代码是这样的

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
//NSLog(@"found characters: %@", string);
// save the characters for the current item...
if ( [currentElement isEqualToString:@"title"]) {
    blogtitle = string;
    NSLog(@"blogtitle....%@",blogtitle);
}else  if ([currentElement isEqualToString:@"pubDate"]) {
    publishdate = string;
    NSLog(@"publishdate....%@",publishdate);
}...

}

---

@Nandkumar：我直接赋值，而不是附加值。但是这些值没有显示在设备中。能否确保只调用一次“parse”方法。