看到别的大牛的博客后，我也写了一个用NSXMLParser解析XML的小例子。

一、解析的XML文件存放在本地，创建工程什么的我就不说了，首先创建XML，如下所示：

<Books>
<Book id="1">
<title>Circumference</title>
<author>Nicholas Nicastro</author>
<summary>Eratosthenens and the Ancient</summary>
</Book>
<Book id="2">
<title>Copernicus Secret</title>
<author>Jack Repcheck</author>
<summary>How the scientific revolution began</summary>
</Book>
</Books>

但是在运行的时候报错：Error Domain=NSXMLParserErrorDomain Code=96 "The operation couldn’t be completed 把那一行去掉就好了，具体什么原因我还不清楚，如果有大牛知道，希望可以指点我一二。

二、把xml加到工程中

三、因为解析的是BOOK条目，创建一个Book类用于存储数据

#import <Foundation/Foundation.h>
 
@interface Book : NSObject
 
@property (nonatomic,copy)NSString *title;
@property (nonatomic,copy)NSString *author;
@property (nonatomic,copy)NSString *summary;
@end

四、我创建的是sigleView的工程，让ViewController继承NSXMLParserDelegate的代理

@interface ViewController()<NSXMLParserDelegate>
{
    NSXMLParser *parser;
    NSMutableArray *array;
    Book *abook;
    NSString *currentString;
}
@end

五、解析XML，在viewController中增加以下代码：

- (void)viewDidLoad
{
    NSError *error = nil;
    NSString *path = [[NSBundle mainBundle]pathForResource:@"book" ofType:@"xml"];
    NSString *string = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:&error];
    NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
    parser = [[NSXMLParser alloc]initWithData:data];
    [parser setShouldProcessNamespaces:NO];
    [parser setShouldReportNamespacePrefixes:NO];
    [parser setShouldResolveExternalEntities:NO];
    [parser setDelegate:self];
    [parser parse];
    [super viewDidLoad];
}

六、解析过程，直接上代码：

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
    if([elementName isEqualToString:@"Books"])
    {
        array = [[NSMutableArray alloc]init];
    }
    else if([elementName isEqualToString:@"Book"])
    {
        abook = [[Book alloc]init];
    }
}
 
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
    if(![string isEqualToString:@"\n"])
    {
        currentString = [[NSString alloc]initWithString:string];
        
    }
}
// sent when the namespace prefix in question goes out of scope.
 
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
    if([elementName isEqualToString:@"Books"])
        return;
    if([elementName isEqualToString:@"Book"])
    {
        [array addObject:abook];
        [abook release];
        abook = nil;
    }
    else
    {
        [abook setValue:currentString forKey:elementName];
        [currentString release];
        currentString = nil;
    }
}

七、解析完了我还在界面增加了个按钮打印array中的值。

在界面上增加一个按钮，点击后打印array的值。

-(void) buttonDown
{
    NSLog(@"%@",array);
}

-(NSString*)description
{
    return [NSString stringWithFormat:@"%@,%@,%@",self.title,self.author,self.summary];
}