MJExtension json快速解析

MJExtension

长话短说下面我们通过一个列子来看下怎么使用

1、 先把框架拉进去你的项目

2、 首先我这次用到的json最外层是一个字典，根据数据的模型我们可以把这个归类为字典中有数组，数组中还有其他 针对于这种情况 我需要建立两个数据模型 一个是要获取其中的数组 另一个数组中的的City元素

代码后面讲解思路

#import <Foundation/Foundation.h>

@interface NSCity : NSObject

@property (nonatomic,strong)NSString *city;

@property (nonatomic,strong)NSString *h5_url;

@property (nonatomic,strong)NSNumber* ID;

@property (nonatomic,strong)NSString *deal_url;

@end

// NSCity.m

// MJExtension example

//

// Created by tareba on 15/12/18.

// Copyright © 2015年
tanada. All rights reserved.

//

#import "NSCity.h"

@implementation NSCity

- (void)setValue:(id)value forUndefinedKey:(NSString *)key {

if ([key isEqualToString:@"id"])
{

self.ID=value;

}

}

@end

#import <Foundation/Foundation.h>

@interface NSDeals : NSObject

@property (nonatomic,strong)NSMutableArray *deals;

@end

#import "NSDeals.h"

#import "MJExtension.h"

@implementation NSDeals

下面的方法是关键

、、

+ (NSDictionary *)mj_objectClassInArray

{

return @{

@"deals" :
@"NSCity",

};

}

@end

#import "ViewController.h"

#import "MJExtension.h"

#import "NSCity.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

NSURLRequest *request =[NSURLRequest
requestWithURL:[NSURL
URLWithString:@"http://api.dianping.com/v1/deal/find_deals?appkey=4123794720&category=%E7%BE%8E%E9%A3%9F&city=%E9%83%91%E5%B7%9E®ion=%E9%87%91%E6%B0%B4%E5%8C%BA&sort=2&sign=FB7A61EB742A4B697B666985348614C7A8F763A3"]];

NSURLSession *seesion = [NSURLSession
sharedSession];

NSURLSessionDataTask *task =[seesion
dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data,
NSURLResponse * _Nullable response, NSError * _Nullable error) {

NSDictionary *dic=
[NSJSONSerialization JSONObjectWithData:data
options:NSJSONReadingMutableContainers error:nil];



NSDeals *result =[NSDeals
mj_objectWithKeyValues:dic];

for (NSCity *city in
result.deals) {

NSLog(@"%lu",(unsigned long)result.deals.count);

NSLog(@"%@",city.deal_url);

}

}];

[task resume];

}

@end

这个方法是将json数据的层级关系，变成属性关系，下一层成为了上一层的属性，然后通过属性直接姐可以访问了。至于关键字成为属性，由于时间紧迫未来的及验证是否和平时利用
setvaluefor undefinekey的法解决是否相同 待验证后会尽快修改