解析xml

方案一：

#import "xmlViewController.h"

@implementation xmlViewController


static NSString *feedURLString = @"http://headlines.yahoo.co.jp/rss/sci.xml";

- (void)parserDidStartDocument:(NSXMLParser *)parser
{
    // 解析开始时的处理
}

- (void)parseXMLFileAtURL:(NSURL *)URL parseError:(NSError **)error
{
    NSXMLParser *parser = [[NSXMLParser alloc] initWithContentsOfURL:URL];
    [parser setDelegate:self];
    [parser setShouldProcessNamespaces:NO];
    [parser setShouldReportNamespacePrefixes:NO];
    [parser setShouldResolveExternalEntities:NO];
    [parser parse];
    NSError *parseError = [parser parserError];
    if (parseError && error) {
        *error = parseError;
    }
    [parser release];
}

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
    // 元素开始句柄
    if (qName) {
        elementName = qName;
    }
    if ([elementName isEqualToString:@"PicInfoListResult"]) {
        // 输出属性值
        //NSLog(@"Name is %@", [attributeDict objectForKey:@"Success"]);//,[attributeDict objectForKey:@"RecordCount"]);
        
        
    }
}

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
    // 元素终了句柄
    if (qName) {
        elementName = qName;
    }
}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
    // 取得元素的text
    NSLog(@"%@",string);
}

- (void)viewDidLoad{
    NSError *parseError = nil;
    [self parseXMLFileAtURL:[NSURL URLWithString:feedURLString] parseError:&parseError];
    
    [super viewDidLoad];
}

- (void)dealloc {
    [super dealloc];
}

@end

　　

方案二：

#import "xml2ViewController.h"

@implementation xml2ViewController

+(void) parseTest {  
    // 取得获取Yahoo新闻标题的RSS  
    NSString *urlStr = @"http://headlines.yahoo.co.jp/rss/sci.xml";  
    // 使用NSXMLParser三部曲：生成、设置代理和开始解析  
    NSXMLParser *parser = [[NSXMLParser alloc]  
                           initWithContentsOfURL:[NSURL URLWithString:urlStr]];  
    xml2ViewController *sp = [[xml2ViewController alloc]init];  
    
    [parser setDelegate:sp];  
    [parser parse];  
    NSError *parseError = [parser parserError];  
    if (parseError ) {  
        NSLog(@"Err %@",[parseError description]);  
    }  
    NSLog(@"parseEnd");  
}  

- (void)viewDidLoad{
    [xml2ViewController parseTest];
    
    [super viewDidLoad];
}

-(id)init {  
    if (self = [super init]) {  
        tagPath = [[[NSMutableArray alloc]init]retain];  
        tagPathAttributs = [[[NSMutableArray alloc]init]retain];  
        [tagPath addObject:@""];  
        [tagPathAttributs addObject:[NSDictionary dictionary]];  
    }  
    return self;  
}  
-(void)dealloc {  
    [tagPath release];  
    [tagPathAttributs release];  
    [super dealloc];  
}  

// 获取Tag的全路径  
-(NSString*)tagFullPath {  
    return [tagPath componentsJoinedByString:@"/"];  
}  

// 开始解析  
- (void)parser:(NSXMLParser *)parser  
didStartElement:(NSString *)elementName  
  namespaceURI:(NSString *)namespaceURI  
 qualifiedName:(NSString *)qName  
    attributes:(NSDictionary *)attributeDict  
{  
    NSString *tag = [elementName copy];  
    [tagPath addObject:tag];  
    [tagPathAttributs addObject:[attributeDict copy]];  
    
    //开始获取文字列  
    NSString *tagFullPath = [self tagFullPath];  
    NSLog(@"%@",tagFullPath);
    if ([tagFullPath hasPrefix:@"/PicInfoListResult/Success"]) {  
        recordingText = [[[NSMutableString alloc]init] autorelease];  
        [recordingText appendString:@""];  
        NSLog(@"%@",recordingText);
    }
}  

// Tag的完成  
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName  
  namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {  
    //结束获取文字列  
    NSString *tagFullPath = [self tagFullPath];  
    if ([tagFullPath hasPrefix:@"/PicInfoListResult/Success"]) {  
        NSLog(@"Title:%@",recordingText);  
        recordingText = nil;
    }  
    
    [tagPath removeLastObject];  
    [tagPathAttributs removeLastObject];  
}  

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string {  
    // 记录所取得的文字列  
    if (recordingText!=nil) {  
        [recordingText appendString:string];  
    }  
    NSLog(@"%@",string);
}  
- (void)parser:(NSXMLParser *)parser foundCDATA:(NSData *)CDATABlock{  
    //NSLog(@"cData:%@",[NSString stringWithUTF8String:[CDATABlock bytes]]);  
} 

@end