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 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <Books>
 3   <Book id="1">
 4       <title>Circumference</title>
 5       <author>Nicholas Nicastro</author>
 6       <summary>Eratosthenes and the Ancient</summary>
 7   </Book>
 8   <Book id="2">
 9       <title>Copernicus Secret</title>
10       <author>Jack Repcheck</author>
11       <summary>How the scientific revolution began</summary>
12   </Book>
13   <Book id="3">
14       <title>Angels and Demons</title>
15       <author>Dan Brown</author>
16       <summary>Robert Langdon is summoned to a Swiss</summary>
17   </Book>
18 </Books>

 1 // Book.h
 2 #import <UIKit/UIKit.h>
 3 @interface Book:NSObject {
 4    NSInteger  bookID;
 5    NSString    *title;
 6    NSString    *author;
 7    NSString    *summary;
 8 }
 9 
10 @property (nonatomic, readwrite) NSInteger bookID;
11 @property (nonatomic, retain) NSString  *title;
12 @property (nonatomic, retain) NSString  *author;
13 @property (nonatomic, retain) NSString  *summary;
14 
15 @end
16 
17 //Book.m
18 #import "Book.h"
19 @implementation Book
20 @synthesize title,author,summary,bookID;
21 
22 - (void)dealloc {
23    [summary release];
24    [author release];
25    [title release];
26    [super dealloc];
27 }
28 @end

// AppDelegate.h
@interface AppDelegate : NSObject <UIApplicationDelegate> {
    //默認缺省的實(shí)例變量

    NSMutableArray  *books;
}
//默認缺省的屬性定義

@property (nonatomic, retain) NSMutableArray  *books;
@end

// XMLParser.h
#import <UIKit/UIKit.h>

@class AppDelegate, Book;
@interface XMLParser : NSObject {
   NSMutableString *currentElementValue;  //用于存儲元素標簽的值
   AppDelegate *appDelegate;
   Book *aBook;  //書(shū)籍實(shí)例
}

- (XMLParser *)initXMLParser; //構造器
@end

// XMLParser.m
- (XMLParser *)initXMLParser {
  [super  init];
  appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
  return self;
}

 1 //XMLParser.m
 2 #import "XMLParser.h"
 3 #import "XMLAppDelegate.h"
 4 #import "Book.h"
 5  
 6 @implementation XMLParser
 7  
 8 - (XMLParser *) initXMLParser {
 9  
10 [super init];
11  
12 appDelegate = (XMLAppDelegate *)[[UIApplication sharedApplication] delegate];
13  
14 return self;
15 }
16  
17 - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName
18 namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName
19 attributes:(NSDictionary *)attributeDict {
20  
21 if([elementName isEqualToString:@"Books"]) {
22 //Initialize the array.
23 //在這里初始化用于存儲最終解析結果的數組變量,我們是在當遇到Books根元素時(shí)才開(kāi)始初始化，有關(guān)此初始化過(guò)程也可以在parserDidStartDocument 方法中實(shí)現
24 appDelegate.books = [[NSMutableArray alloc] init];
25 }
26 else if([elementName isEqualToString:@"Book"]) {
27  
28 //Initialize the book.
29 //當碰到Book元素時(shí)，初始化用于存儲Book信息的實(shí)例對象aBook
30 aBook = [[Book alloc] init];
31  
32 //Extract the attribute here.
33 //從attributeDict字典中讀取Book元素的屬性
34 aBook.bookID = [[attributeDict objectForKey:@"id"] integerValue];
35  
36 NSLog(@"Reading id value :%i", aBook.bookID);
37 }
38  
39 NSLog(@"Processing Element: %@", elementName);
40 }
41 /* 可以看出parser:didStartElement:namespaceURI:qualifiedName:attributes方法實(shí)現的就是在解析元素開(kāi)始標簽時(shí)，進(jìn)行一些初始化流程 */
42  
43 - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string {
44 // 當用于存儲當前元素的值是空時(shí)，則先用值進(jìn)行初始化賦值
45 // 否則就直接追加信息 
46 if(!currentElementValue)
47 currentElementValue = [[NSMutableString alloc] initWithString:string];
48 else
49 [currentElementValue appendString:string];
50  
51 NSLog(@"Processing Value: %@", currentElementValue);
52  
53 }
54 
55 // 這里才是真正完成整個(gè)解析并保存數據的最終結果的地方
56 - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName
57 namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {
58  
59 if([elementName isEqualToString:@"Books"])
60 return;
61  
62 //There is nothing to do if we encounter the Books element here.
63 //If we encounter the Book element howevere, we want to add the book object to the array 遇到Book元素的結束標簽，則添加book對象到設置好的數組中。
64 // and release the object.
65 if([elementName isEqualToString:@"Book"]) {
66 [appDelegate.books addObject:aBook];
67  
68 [aBook release];
69 aBook = nil;
70 }
71 else
72 // 不是Book元素時(shí)也不是根元素，則用 setValue:forKey為當前book對象的屬性賦值
73 [aBook setValue:currentElementValue forKey:elementName];
74  
75 [currentElementValue release];
76 currentElementValue = nil;
77 }
78  
79 - (void) dealloc {
80  
81 [aBook release];
82 [currentElementValue release];
83 [super dealloc];
84 }
85  
86 @end