网络热恋之json解析

现在的app开发很少有用到XML解析的了，主流的则是JSON。

 //
 //  ViewController.m
 //  CX－JSON解析（三方JSONKit-master）

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

 @end

 @implementation ViewController

 - (void)viewDidLoad {
     [super viewDidLoad];

     NSString * urlString = @"http://localhost/city.json";

     NSURL * url = [NSURL URLWithString:urlString];

     NSURLRequest * request = [[NSURLRequest alloc]initWithURL:url cachePolicy: timeoutInterval:];

     [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
        //重点是这行代码，理解就可以，这个三方很好用。
         NSDictionary * dict = [data objectFromJSONData];

         NSArray * array = [dict objectForKey:@"city"];

         for (NSDictionary * dictTwo in array) {

             NSLog(@"%@",dictTwo);

         }

     }];

 }
 /*
  一部分结果
  2016-03-18 19:53:11.441 CX－JSON解析（三方JSONKit-master）[6130:389488] {
  city =     (
  {
  "city_id" = 1;
  "city_name" = "\U897f\U57ce\U533a";
  },
  {
  "city_id" = 2;
  "city_name" = "\U671d\U9633\U533a";
  },
  {
  "city_id" = 3;
  "city_name" = "\U6d77\U6dc0\U533a";
  },
  {
  "city_id" = 4;
  "city_name" = "\U4e30\U53f0\U533a";
  },
  {
  "city_id" = 5;
  "city_name" = "\U77f3\U666f\U5c71\U533a";
  },
  {
  "city_id" = 6;
  "city_name" = "\U901a\U5dde\U533a";
  },
  {
  "city_id" = 7;
  "city_name" = "\U987a\U4e49\U533a";
  },
  {
  "city_id" = 8;
  "city_name" = "\U623f\U5c71\U533a";
  },
  {
  "city_id" = 9;
  "city_name" = "\U5927\U5174\U533a";
  },
  {
  "city_id" = 10;
  "city_name" = "\U660c\U5e73\U533a";
  },
  {
  "city_id" = 11;
  "city_name" = "\U6000\U67d4\U533a";
  },
  {
  "city_id" = 12;
  "city_name" = "\U5e73\U8c37\U533a";
  },
  {
  "city_id" = 13;
  "city_name" = "\U95e8\U5934\U6c9f\U533a";
  },
  {
  "city_id" = 14;
  "city_name" = "\U5bc6\U4e91\U53bf";
  },

    */

 @end