iOS上的NSXMLParser，如何在给定xml文件的情况下使用它 [英] NSXMLParser on iOS, how do I use it given a xml file

问题描述

我想知道如何使用NSXML解析器。
所以可以说，假设我有一个简单的xml文件，其元素如下：

I was wondering how do I use the NSXML parser. so lets say given I have a simple xml file with elements like:

<Today>
<Date>1/1/1000</Date>
<Time>14:15:16</Time>
</Today>

如何使用NSXMLParser解析XML文件（位于本地btw，桌面），检查通过每个元素并将它们每个存储在一个数组中以供以后显示/使用？

How could I use the NSXMLParser to parse the XML File (It's on locally btw, desktop), check through each element and store each of them in an array either to be displayed/used later?

我正在浏览有关它的一些文档，但我不知道如何使用解析器
我知道有3种方法（或更多，如果我错了，请纠正我）可以被覆盖的方法
-.. etc didStartElement
-.. etc didEndElement
-.. etc foundCharacters

I was looking through some documentation about it and I have no idea on how to use the parser I know that there are 3 methods (or more, please correct me if I'm wrong) that can be overridden -..etc didStartElement -..etc didEndElement -..etc foundCharacters

推荐答案

最简单的方法是执行以下操作：

The simplest thing is to do something like this:

NSXMLParser *xmlParser = [[NSXMLParser alloc]initWithData:<yourNSData>];
[xmlParser setDelegate:self];
[xmlParser parse];

请注意setDelegate：将委托设置为 self，即当前对象。因此，在该对象中，您需要实现在问题中提到的委托方法。

Notice that setDelegate: is setting the delegate to 'self', meaning the current object. So, in that object you need to implement the delegate methods you mention in the question.

因此，在代码中进一步粘贴：

so further down in your code, paste in:

    - (void) parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName 
        namespaceURI:(NSString *)namespaceURI
       qualifiedName:(NSString *)qualifiedName 
         attributes:(NSDictionary *)attributeDict{

       NSLog(@"I just found a start tag for %@",elementName);
       if ([elementName isEqualToString:@"employee"]){
       // then the parser has just seen an <employee> opening tag
       }         
     }

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
NSLog(@"the parser just found this text in a tag:%@",string);
}

等。等等。

当您想将变量设置为某些标签的值等操作时，要困难一些，但通常使用类变量来完成，例如 BOOL inEmployeeTag ，您在 didStartElement ：方法中将其设置为true（YES），在<$ c $中将其设置为false c> didEndElement ：方法-然后在 foundCharacters 方法中检查其值。如果是，则将var分配给string的值，否则将其分配给字符串。

It's a little harder when you want to do something like set a variable to the value of some tag, but generally it's done using a class variable caleld something like "BOOL inEmployeeTag" which you set to true (YES) in the didStartElement: method and false in the didEndElement: method - and then check for it's value in the foundCharacters method. If it's yes, then you assign the var to the value of string, and if not you don't.

richard

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