在iOS 开发中用GDataXML(DOM方式)解析xml文件

因为GDataXML的内部实现是通过DOM方式解析的，而在iOS 开发中用DOM方式解析xml文件，这个时候我们需要开启DOM，因为ios 开发中是不会自动开启的，只有在mac 开发中才自动开启的。我们需要做如下配置：

当配置玩这个操作之后，再次进行编译的时候，系统还是报错，是因为我们还需要进行如下操作：

//
//  ViewController.m
//  04-xml解析GDataXML（DOM方式）
//
//  Created by jerry on 15/9/29.
//  Copyright (c) 2015年 jerry. All rights reserved.
//

#import "ViewController.h"
#import "GDataXMLNode.h"
#import "Video.h"
@interface ViewController ()
@property(nonatomic,strong)NSMutableArray *videos;
@end

@implementation ViewController
-(NSMutableArray *)videos
{
    if (_videos ==nil) {
        _videos = [NSMutableArray array];
    }
    return _videos;
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
     // 1.URL
    NSURL *url = [NSURL URLWithString:@"http://127.0.0.1/videos.xml"];
    
    // 2.send request
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    
    // 3.connection
    [NSURLConnection sendAsynchronousRequest:request queue:[[NSOperationQueue alloc]init] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
         // 将xml 整个文件读入内存，对应的就是GDataXMLDocument 对象
        GDataXMLDocument *document = [[GDataXMLDocument alloc] initWithData:data error:NULL];
        // 对应的是 videos
//        NSLog(@"%@",document.rootElement.children);
        for (GDataXMLElement *element in document.rootElement.children) {
            // 对应的是video对象，所以就在这里创建video对象
//            NSLog(@"%@",element);
            Video *video = [[Video alloc] init];
            // 这个遍历  就是取出video对象对应的所有属性
            for (GDataXMLElement *node in element.children) {
                //  拿到所有的值，对应的是每一个属性
//                NSLog(@"%@----%@",node.name,node.stringValue);
                
                [video setValue:node.stringValue forKeyPath:node.name];
            }
            // 跟踪属性
//            NSLog(@"%@",element.attributes);
            // 遍历element.attributes 数组，拿到属性值
            for (GDataXMLNode *att in element.attributes) {
                // kvc 进行赋值
                [video setValue:att.stringValue forKeyPath:att.name];
            }
            // 模型添加到一个数组
            [self.videos addObject:video];
        }
        NSLog(@"搞定。。。%@",self.videos);
    }];
}

@end

video.h

#import <Foundation/Foundation.h>

@interface Video : NSObject

@property (nonatomic, copy) NSNumber *videoId;
@property (nonatomic, copy) NSString *name;
@property (nonatomic, copy) NSNumber *length;
@property (nonatomic, copy) NSString *videoURL;
@property (nonatomic, copy) NSString *imageURL;
@property (nonatomic, copy) NSString *desc;
@property (nonatomic, copy) NSString *teacher;

@property (nonatomic, readonly) NSString *time;

- (instancetype)initWithDict:(NSDictionary *)dict;
+ (instancetype)videoWithDict:(NSDictionary *)dict;

@end

video.m

#import "Video.h"

@implementation Video

- (instancetype)initWithDict:(NSDictionary *)dict {
    self = [super init];
    if (self) {
        [self setValuesForKeysWithDictionary:dict];
    }
    return self;
}

+ (instancetype)videoWithDict:(NSDictionary *)dict {
    return [[self alloc] initWithDict:dict];
}

- (NSString *)time {
    int len = self.length.intValue;
    
    return [NSString stringWithFormat:@"%02d:%02d:%02d", len / 3600, (len % 3600) / 60, (len % 60)];
}

- (NSString *)description {
    return [NSString stringWithFormat:@"<%@ : %p> { videoId : %@, name : %@, length : %@, videoURL : %@, imageURL : %@, desc : %@, teacher : %@}", [self class], self, self.videoId, self.name, self.length, self.videoURL, self.imageURL, self.desc, self.teacher];
}

@end

如果还报错，引入log

#import <Foundation/Foundation.h>

@interface NSArray (Log)

@end

@interface NSDictionary (Log)

@end

#import "NSArray+Log.h"

@implementation NSArray (Log)

- (NSString *)descriptionWithLocale:(id)locale
{
    NSMutableString *strM = [NSMutableString stringWithString:@"(
"];
    
    [self enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
        [strM appendFormat:@"	%@,
", obj];
    }];
    
    [strM appendString:@")"];
    
    return strM;
}

@end

@implementation NSDictionary (Log)

- (NSString *)descriptionWithLocale:(id)locale
{
    NSMutableString *strM = [NSMutableString stringWithString:@"{
"];
    
    [self enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
        [strM appendFormat:@"	%@ = %@;
", key, obj];
    }];
    
    [strM appendString:@"}
"];
    
    return strM;
}

@end