<?xml version="1.0" encoding="utf-8"?>
<Users><User id="1"><name>Tom</name><age>20</age></User><User id="2"><name id = "222">John</name><age>33</age></User><User><name id = "333">Eric</name><age>43</age></User><User><name id = "444">Tony</name><age>54</age></User>
</Users>

//
//  Person.h
//  XmlDemo
//
//  Created by City--Online on 15/4/29.
//  Copyright (c) 2015年 CYW. All rights reserved.
//#import <Foundation/Foundation.h>@interface Person : NSObject@property(nonatomic,strong)NSString *Pid;@property(nonatomic,strong)NSString *Name;@property(nonatomic,assign)int Age;
@end

//
//  ViewController.m
//  XmlDemo
//
//  Created by City--Online on 15/4/29.
//  Copyright (c) 2015年 CYW. All rights reserved.
//#import "ViewController.h"
#import "Person.h"@interface ViewController () <NSXMLParserDelegate>
@property (nonatomic, strong) NSMutableArray *personArray;
@property (nonatomic, strong) NSMutableString *element;@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];//    XML的解析方式有2种
//    DOM:一次性将整个XML文档加载进内存,比较适合解析小文件 文档驱动
//    SAX:从根元素开始,按顺序一个元素一个元素往下解析,比较适合解析大文件 事件驱动//IOS自带的属于SAX事件驱动的解析方式
//    就是一个事物模型解析，从头开始读取文档然后根据读取到的头标签,读完头标签后，理论上是读取标签值,然后读取后遇到结束标签等NSString *path=[[NSBundle mainBundle]pathForResource:@"user" ofType:@"xml"];NSURL *url=[[NSURL alloc]initFileURLWithPath:path];//实例化NSXMLParser *parser=[[NSXMLParser alloc]initWithContentsOfURL:url];//设置代理parser.delegate=self;//开始解析[parser parse];}
// step1 开始解析
-(void)parserDidStartDocument:(NSXMLParser *)parser
{self.personArray = [[NSMutableArray alloc] initWithCapacity:0];self.element = [[NSMutableString alloc] init];
}//step2 开始解析元素 获取头标签的信息<>里面的属性、名字
-(void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{if ([elementName isEqualToString:@"Users"]) {NSLog(@"进入<Users>");}if ([elementName isEqualToString:@"User"]) {NSLog(@"进入<User>");Person *user = [[Person alloc] init];[_personArray addObject:user];}if ([elementName isEqualToString:@"name"]) {NSLog(@"进入<name>");Person *user = [_personArray objectAtIndex:[_personArray count] -1];user.Pid = [attributeDict objectForKey:@"id"];}if ([elementName isEqualToString:@"age"]) {NSLog(@"进入<age>");}}
//step3 获得首尾标签间 > < 的内容
//此处分几种情况:
//1.当标签间内容为“”,如果</></>(如图</age></User></Users>)则进入step4,否则进入step2
//2.当标签间内容不为“”,则进入step4
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{NSLog(@"%@", string);//获取文本节点中的数据，因为下面的方法要保存这里获取的数据，所以要定义一个全局变量(可修改的字符串)//这里要赋值为空，目的是为了清空上一次的赋值[_element setString:@""];[_element appendString:string];//string是获取到的文本节点的值，只要是文本节点都会获取(包括换行)，然后到下个方法中进行判断区分
}
//step4 标签解析结束</>
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementNamenamespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {
//    NSLog(@"%@", elementName);NSString *str=[[NSString alloc] initWithString:_element];if ([elementName isEqualToString:@"Users"]) {NSLog(@"</Users>= %@",str);}if ([elementName isEqualToString:@"name"]) {NSLog(@"</name>=%@",str);Person *user = [_personArray objectAtIndex:[_personArray count] -1];user.Name = str;}if ([elementName isEqualToString:@"age"]) {NSLog(@"</age>=%@",str);Person *user = [_personArray objectAtIndex:[_personArray count] -1];user.age = (int)[str integerValue];}if ([elementName isEqualToString:@"User"]) {NSLog(@"</User>=%@ ",str);}
}
//step5 解析结束
-(void)parserDidEndDocument:(NSXMLParser *)parser
{for (Person *p in self.personArray) {NSLog(@"%@  %d %@",p.Name,p.Age,p.Pid);}
}
//解析报错
-(void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError
{NSLog(@"解析有误 Error:%@",parseError);}- (void)didReceiveMemoryWarning {[super didReceiveMemoryWarning];// Dispose of any resources that can be recreated.
}@end