SAX解析

1.创建Student 继承NSObject
2.在Student.h中写入属性

@property(nonatomic,strong)NSString *name,*age,*sex;

3.A.m中写入导航

#import "AppDelegate.h"
#import "ViewController.h"
@interface AppDelegate ()

@end

@implementation AppDelegate


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    
   self.window.rootViewController = [[UINavigationController alloc]initWithRootViewController:[ViewController new]];
    
    
    
    return YES;
}

4.v.m中写入解析内容

#import "ViewController.h"
#import "Student.h"
@interface ViewController ()<UITableViewDataSource,UITableViewDelegate,NSXMLParserDelegate>


@property(nonatomic,strong) UITableView * tableView;
@property(nonatomic,strong) NSMutableArray * dataSource;
@property(nonatomic,strong) Student * student;

@property(nonatomic,strong) NSString * string;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.title = @"XML SAX解析";
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:@"解析" style:UIBarButtonItemStylePlain target:self action:@selector(SAX)];
    //将表格添加到视图
    
    [self.view addSubview:self.tableView];
    
}
//点击按钮方法  解析
-(void)SAX{
    
    NSURL *url = [NSURL URLWithString:@"http://127.0.0.1/student.xml"];
    //创建路径
    //创建NSXMLParser解析器
    NSXMLParser *parser = [[NSXMLParser alloc] initWithContentsOfURL:url];
    //遵守协议  设置代理
    parser.delegate = self;
    
    //开始解析
    [parser parse];
    
}
#pragma mark - NSXMLParserDelegate 方法

//开始解析元素
- (void)parserDidStartDocument:(NSXMLParser *)parser{
    
    NSLog(@"开始解析文档");
    //初始化数组
    self.dataSource = [[NSMutableArray alloc] init];
    
    
}
//结束解析的时候
-(void)parserDidEndDocument:(NSXMLParser *)parser{
    
    NSLog(@"已经结束解析文档");
    
    //刷新表格
    [self.tableView reloadData];
}

//开始解析元素的时候
-(void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary<NSString *,NSString *> *)attributeDict{
    
    NSLog(@"遇到开始解析元素/标签 %@",elementName);
    if ([elementName isEqualToString:@"student"]) {
        //实例化一个学生
        self.student = [[Student alloc] init];
        
        
    }
    
    
}
//遇到结束标签的时候
-(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{
    
    NSLog(@"遇到结束标签 %@",elementName);
    
    if ([elementName isEqualToString:@"name"]) {
        
        self.student.name = self.string;
        
    }else if ([elementName isEqualToString:@"age"]){
        
        self.student.age = self.string;
    }else if ([elementName isEqualToString:@"sex"]){
        
        self.student.sex = self.string;
    }else if ([elementName isEqualToString:@"student"]){
        
        //将学生添加到数组里
        [self.dataSource addObject:self.student];
        
    }
    
    
}
//发现标签改变的时候
-(void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
    
    NSLog(@"遇到的内容 %@",string);
    
    self.string = string;
    
}
-(UITableView *)tableView{
    if (!_tableView) {
        _tableView = [[UITableView alloc]initWithFrame:self.view.frame style:UITableViewStylePlain];
        _tableView.delegate  = self;
        _tableView.dataSource = self;
    }
    return _tableView;
}

#pragma mark - 数据源方法
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    
    return self.dataSource.count;
    
    
}
//设置cell内容
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    
    UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
    if (cell==nil) {
        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"cell"];
        
    }
    //设置cell内容
    cell.textLabel.text = [self.dataSource[indexPath.row] name];
    cell.detailTextLabel.text = [NSString stringWithFormat:@"age = %@ sex = %@",[self.dataSource[indexPath.row] age],[self.dataSource[indexPath.row] sex]];
    
    return cell;
}



@end