ios - 如何在 Objective C 中解析 XML 文件

Question

我正在尝试解析 this xml file .我遇到的问题是我想使用-(void)parser:(NSXMLParser*)parser didStartElement ... 深入到此 xml 文件的多个级别。

这是我目前所拥有的:

#pragma didStartElement (from the parser protocol)
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
    // Choose the tag
    if ([elementName isEqualToString:@"item"]) {

        NSString *firstName = [attributeDict valueForKey:@"firstname"];
        NSString *lastName = [attributeDict valueForKey:@"lastname"];
        NSString *birthDay = [attributeDict valueForKey:@"birthday"];

        Politician *politician = [[Politician alloc] initWithName:firstName lName:lastName bDay:birthDay];

        if (politician != nil) {

            [people addObject:politician];
        }
    }

}

问题是这段代码没有向下钻取。有没有一种方法可以选择性地从特定标签(例如:人)开始解析并检查该标签的键或重写“elementName”的值以便我可以使用 multipe if 语句？这样做的正确方法是什么？非常感谢。

Answer 1

您无法在您的 attributeDict 中获取名字、姓氏等。属性字典包含如下格式的值

<count n="1">

在上面的例子中，attributeDict 保存了 n

的值

为了解析给定的 xml，您可以使用以下代码。

声明对象

Politician *politician;
NSString *curElement;
NSMutableArray *politicians;
BOOL isCongressNumbers;

初始化 viewDidLoad 中的政治家

politicians = [[NSMutableArray alloc]init];

添加委托(delegate)方法

#pragma mark - NSXMLParser Delegate

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
    if ([elementName isEqualToString:@"item"]) {
        politician = [[Politician alloc]init];

    } else if ([elementName isEqualToString:@"congress_numbers"])  {
        isCongressNumbers = YES;
    }

}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
    curElement = string;


}

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
    if ([elementName isEqualToString:@"item"]  && !isCongressNumbers) {
        [politicians addObject:politician];
    } else if ([elementName isEqualToString:@"firstname"])  {
        politician.name = curElement;
    } else if ([elementName isEqualToString:@"lastname"])  {
        politician.lName = curElement;
    } else if ([elementName isEqualToString:@"birthday"])  {
        politician.bDay = curElement;
    } else if ([elementName isEqualToString:@"congress_numbers"])  {
        isCongressNumbers = NO;
    }
}