UITableView 分页显示，数据源远程数据，使用JSON格式 [xcode 4.4.1]

在这篇里，我们要学习的目标：

1. 1. 解析远程的JSON数据
2. 2. 分页显示数据
3. 3. 学习Category的使用

概述

    IOS5.0开始支持JSON，所以不用第三方的解析了，主要用于这三个对象：NSDictionary、NSData、NSJSONSerializatio

今天我们做一个天气预报数据的展示，通过国家气象局提供的天气预报接口来获取数据。注：以实现功能为主，不做过多的界面上展示
接口地址：

1. http://www.weather.com.cn/data/sk/101010100.html
2. http://www.weather.com.cn/data/cityinfo/101010100.html
3. http://m.weather.com.cn/data/101010100.html

    以第三个地址显示内容最全，我们就以这个地获取数据，返回的数据格式如下：   

View Code

 1 {
 2     "weatherinfo":{
 3         "city":"北京",
 4         "city_en":"beijing",
 5         "date_y":"2012年9月5日",
 6         "date":"",
 7         "week":"星期三",
 8         "fchh":"11",
 9         "cityid":"101010100",
10         "temp1":"27℃~17℃",
11         "temp2":"24℃~17℃",
12         "temp3":"25℃~17℃",
13         "temp4":"27℃~16℃",
14         "temp5":"28℃~17℃",
15         "temp6":"26℃~17℃",
16         "tempF1":"80.6℉~62.6℉",
17         "tempF2":"75.2℉~62.6℉",
18         "tempF3":"77℉~62.6℉",
19         "tempF4":"80.6℉~60.8℉",
20         "tempF5":"82.4℉~62.6℉",
21         "tempF6":"78.8℉~62.6℉",
22         "weather1":"晴转阴",
23         "weather2":"阵雨",
24         "weather3":"阵雨转多云",
25         "weather4":"多云转晴",
26         "weather5":"晴",
27         "weather6":"多云转阵雨",
28         "img1":"0",
29         "img2":"2",
30         "img3":"3",
31         "img4":"99",
32         "img5":"3",
33         "img6":"1",
34         "img7":"1",
35         "img8":"0",
36         "img9":"0",
37         "img10":"99",
38         "img11":"1",
39         "img12":"3",
40         "img_single":"0",
41         "img_title1":"晴",
42         "img_title2":"阴",
43         "img_title3":"阵雨",
44         "img_title4":"阵雨",
45         "img_title5":"阵雨",
46         "img_title6":"多云",
47         "img_title7":"多云",
48         "img_title8":"晴",
49         "img_title9":"晴",
50         "img_title10":"晴",
51         "img_title11":"多云",
52         "img_title12":"阵雨",
53         "img_title_single":"晴",
54         "wind1":"微风",
55         "wind2":"微风",
56         "wind3":"微风",
57         "wind4":"微风",
58         "wind5":"微风",
59         "wind6":"微风",
60         "fx1":"微风",
61         "fx2":"微风",
62         "fl1":"小于3级",
63         "fl2":"小于3级",
64         "fl3":"小于3级",
65         "fl4":"小于3级",
66         "fl5":"小于3级",
67         "fl6":"小于3级",
68         "index":"暖",
69         "index_d":"较凉爽，建议着长袖衬裤等春秋过渡装。体弱者宜着长袖衬衫和马甲。但昼夜温差较大，请适当增减衣服。",
70         "index48":"暖",
71         "index48_d":"较凉爽，建议着长袖衬衫加单裤等春秋过渡装。年老体弱者宜着针织长袖衬衫、马甲和长裤。",
72         "index_uv":"中等",
73         "index48_uv":"弱",
74         "index_xc":"不宜",
75         "index_tr":"适宜",
76         "index_co":"较舒适",
77         "st1":"26",
78         "st2":"17",
79         "st3":"22",
80         "st4":"16",
81         "st5":"23",
82         "st6":"17",
83         "index_cl":"适宜",
84         "index_ls":"适宜",
85         "index_ag":"易发"
86     }
87 }

   

    Category 是Objective-C 里面最常用到的功能之一。简单的讲Category可以为已经存在的类增加方法，而不需要增加一个子类。而且，我们可以在不知道某个类内部实现的情况下，为该类增加方法。如果我们想增加某个框架(framework)中的类的方法，Category就非常有效。比如，今天的内容中，就想在NSDictionary上增加一个方法来直接处理URL远程数据，后面有详细代码。  定义格式如下：

1      #import  " 类名.h "  
2      @interface 类名(类别名)  
3          // 新方法的声明  
4       @end 

 

 

具体操作，如下步骤：

1. 创建项目，项目名称：listCityWeather

 

 

2. 添加一个Category类，扩展NSDictionary，主要方便于处理远程的json数据

 

 

  2.1 修改NSDictionary+Json.h文件

 1  //
 2  //   NSDictionary+Json.h
 3  //   listCityWeather
 4  //
 5  //   Created by tony on 12-9-5.
 6  //   Copyright (c) 2012年 chinapcc.com. All rights reserved.
 7  //
 8 
 9  #import <Foundation/Foundation.h>
10 
11  @interface NSDictionary (Json)
12 
13 
14  //  直把远程的地址上Json数据转,换成Dictionary对象
15  +(NSDictionary*)dictionaryWithContentsOfURLString:(NSString*)urlAddress;
16 
17  //  把当前的Dictionary对象,转成Json对象
18  -(NSData*)toJSON;
19 
20  @end

 

  2.2 修改NSDictionary+Json.m文件

 1  //
 2  //   NSDictionary+Json.m
 3  //   listCityWeather
 4  //
 5  //   Created by tony on 12-9-5.
 6  //   Copyright (c) 2012年 chinapcc.com. All rights reserved.
 7  //
 8 
 9  #import  " NSDictionary+Json.h "
10 
11  @implementation NSDictionary (Json)
12 
13  //  直把远程的地址上Json数据转,换成Dictionary对象
14  +(NSDictionary*)dictionaryWithContentsOfURLString:(NSString*)urlAddress
15 {
16      //  请求远程数据，存放到NSData对象中
17      NSData* data =[NSData dataWithContentsOfURL:[NSURL URLWithString: urlAddress]];
18     
19      //  定义一个错误信息的对象
20      __autoreleasing NSError *error =nil;
21     
22      //  序列化字符串
23       id result =[NSJSONSerialization JSONObjectWithData:data
24                                                options:kNilOptions error:&error];
25      if(error !=nil)
26          return nil;
27     
28      return result;
29 }
30 
31  //  把当前的Dictionary对象,转成Json对象
32  -(NSData*)toJSON{
33     NSError *error =nil;
34      //  把当前的Dictionary对象转换成字符串
35       id result =[NSJSONSerialization dataWithJSONObject:self
36                                                options:kNilOptions error:&error];
37      if(error !=nil)
38          return nil;
39     
40      return result;
41 }
42 
43  @end

 

  2.3 调用方法如下：

 1 NSDictionary *city =[NSDictionary dictionaryWithContentsOfJSONURLString: @" http://www.weather.com.cn/data/cityinfo/101010100.html "];
 2 
 3 NSLog( @"  city: %@ ",[[city valueForKey: @" weatherinfo "] valueForKey: @" city "] );
 4 
 5  //////////////////////////////////////////////// /
 6 
 7 NSDictionary *myInfo =[NSDictionary dictionaryWithObjectsAndKeys: @" tony ", @" apple ", @" anny ", @" ada ",nil];
 8 NSData *json =[myInfo toJSON];
 9        
 10 NSLog( @"  json: %@ ",[[NSString alloc]initWithData:json encoding:NSUTF8StringEncoding]);

 

3. 添加plist数据, 地区资料，我就懒得做服务器端程序，这里就用一个plist数据来展示中国有天气的城市列表

 <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
    <dict>
        <key>北京</key>
        <string>101010100</string>
        <key>朝阳</key>
        <string>101071201</string>
        <key>顺义</key>
        <string>101010400</string>
        <key>怀柔</key>
        <string>101010500</string>
        <key>通州</key>
        <string>101010600</string>
        <key>昌平</key>
        <string>101010700</string>
        <key>延庆</key>
        <string>101010800</string>
        <key>丰台</key>
        <string>101010900</string>
        <key>石景山</key>
        <string>101011000</string>
        <key>大兴</key>
        <string>101011100</string>
        <key>房山</key>
        <string>101011200</string>
        <key>密云</key>
        <string>101011300</string>
        <key>门头沟</key>
        <string>101011400</string>
        <key>平谷</key>
        <string>101011500</string>
        <key>八达岭</key>
        <string>101011600</string>
        <key>佛爷顶</key>
        <string>101011700</string>
        <key>汤河口</key>
        <string>101011800</string>
        <key>密云上甸子</key>
        <string>101011900</string>
        <key>斋堂</key>
        <string>101012000</string>
        <key>霞云岭</key>
        <string>101012100</string>
        <key>北京城区</key>
        <string>101012200</string>
        <key>海淀</key>
        <string>101010200</string>
        <key>天津</key>
        <string>101030100</string>
        <key>宝坻</key>
        <string>101030300</string>
        <key>东丽</key>
        <string>101030400</string>
        <key>西青</key>
        <string>101030500</string>
        <key>北辰</key>
        <string>101030600</string>
        <key>蓟县</key>
        <string>101031400</string>
        <key>汉沽</key>
        <string>101030800</string>
        <key>静海</key>
        <string>101030900</string>
        <key>津南</key>
        <string>101031000</string>
        <key>塘沽</key>
        <string>101031100</string>
        <key>大港</key>
        <string>101031200</string>
        <key>武清</key>
        <string>101030200</string>
        <key>宁河</key>
        <string>101030700</string>
        <key>上海</key>
        <string>101020100</string>
        <key>宝山</key>
        <string>101020300</string>
        <key>嘉定</key>
        <string>101020500</string>
        <key>南汇</key>
        <string>101020600</string>
        <key>浦东</key>
        <string>101021300</string>
        <key>青浦</key>
        <string>101020800</string>
        <key>松江</key>
        <string>101020900</string>
        <key>奉贤</key>
        <string>101021000</string>
        <key>崇明</key>
        <string>101021100</string>
        <key>徐家汇</key>
        <string>101021200</string>
        <key>闵行</key>
        <string>101020200</string>
        <key>金山</key>
        <string>101020700</string>
        <key>石家庄</key>
        <string>101090101</string>
        <key>张家口</key>
        <string>101090301</string>
        <key>承德</key>
        <string>101090402</string>
        <key>唐山</key>
        <string>101090501</string>
        <key>秦皇岛</key>
        <string>101091101</string>
        <key>沧州</key>
        <string>101090701</string>
        <key>衡水</key>
        <string>101090801</string>
        <key>邢台</key>
        <string>101090901</string>
        <key>邯郸</key>
        <string>101091001</string>
        <key>保定</key>
        <string>101090201</string>
        <key>廊坊</key>
        <string>101090601</string>
        <key>郑州</key>
        <string>101180101</string>
        <key>新乡</key>
        <string>101180301</string>
        <key>许昌</key>
        <string>101180401</string>
        <key>平顶山</key>
        <string>101180501</string>
        <key>信阳</key>
        <string>101180601</string>
        <key>南阳</key>
        <string>101180701</string>
        <key>开封</key>
        <string>101180801</string>
        <key>洛阳</key>
        <string>101180901</string>
        <key>商丘</key>
        <string>101181001</string>
        <key>焦作</key>
        <string>101181101</string>
        <key>鹤壁</key>
        <string>101181201</string>
        <key>濮阳</key>
        <string>101181301</string>
        <key>周口</key>
        <string>101181401</string>
        <key>漯河</key>
        <string>101181501</string>
        <key>驻马店</key>
        <string>101181601</string>
        <key>三门峡</key>
        <string>101181701</string>
        <key>济源</key>
        <string>101181801</string>
        <key>安阳</key>
        <string>101180201</string>
        <key>合肥</key>
        <string>101220101</string>
        <key>芜湖</key>
        <string>101220301</string>
        <key>淮南</key>
        <string>101220401</string>
        <key>马鞍山</key>
        <string>101220501</string>
        <key>安庆</key>
        <string>101220601</string>
        <key>宿州</key>
        <string>101220701</string>
        <key>阜阳</key>
        <string>101220801</string>
        <key>亳州</key>
        <string>101220901</string>
        <key>黄山</key>
        <string>101221001</string>
        <key>滁州</key>
        <string>101221101</string>
        <key>淮北</key>
        <string>101221201</string>
        <key>铜陵</key>
        <string>101221301</string>
        <key>宣城</key>
        <string>101221401</string>
        <key>六安</key>
        <string>101221501</string>
        <key>巢湖</key>
        <string>101221601</string>
        <key>池州</key>
        <string>101221701</string>
        <key>蚌埠</key>
        <string>101220201</string>
        <key>杭州</key>
        <string>101210101</string>
        <key>舟山</key>
        <string>101211101</string>
        <key>湖州</key>
        <string>101210201</string>
        <key>嘉兴</key>
        <string>101210301</string>
        <key>金华</key>
        <string>101210901</string>
        <key>绍兴</key>
        <string>101210501</string>
        <key>台州</key>
        <string>101210601</string>
        <key>温州</key>
        <string>101210701</string>
        <key>丽水</key>
        <string>101210801</string>
        <key>衢州</key>
        <string>101211001</string>
        <key>宁波</key>
        <string>101210401</string>
        <key>重庆</key>
        <string>101040100</string>
        <key>合川</key>
        <string>101040300</string>
        <key>南川</key>
        <string>101040400</string>
        <key>江津</key>
        <string>101040500</string>
        <key>万盛</key>
        <string>101040600</string>
        <key>渝北</key>
        <string>101040700</string>
        <key>北碚</key>
        <string>101040800</string>
        <key>巴南</key>
        <string>101040900</string>
        <key>长寿</key>
        <string>101041000</string>
        <key>黔江</key>
        <string>101041100</string>
        <key>万州天城</key>
        <string>101041200</string>
        <key>万州龙宝</key>
        <string>101041300</string>
        <key>涪陵</key>
        <string>101041400</string>
        <key>开县</key>
        <string>101041500</string>
        <key>城口</key>
        <string>101041600</string>
        <key>云阳</key>
        <string>101041700</string>
        <key>巫溪</key>
        <string>101041800</string>
        <key>奉节</key>
        <string>101041900</string>
        <key>巫山</key>
        <string>101042000</string>
        <key>潼南</key>
        <string>101042100</string>
        <key>垫江</key>
        <string>101042200</string>
        <key>梁平</key>
        <string>101042300</string>
        <key>忠县</key>
        <string>101042400</string>
        <key>石柱</key>
        <string>101042500</string>
        <key>大足</key>
        <string>101042600</string>
        <key>荣昌</key>
        <string>101042700</string>
        <key>铜梁</key>
        <string>101042800</string>
        <key>璧山</key>
        <string>101042900</string>
        <key>丰都</key>
        <string>101043000</string>
        <key>武隆</key>
        <string>101043100</string>
        <key>彭水</key>
        <string>101043200</string>
        <key>綦江</key>
        <string>101043300</string>
        <key>酉阳</key>
        <string>101043400</string>
        <key>秀山</key>
        <string>101043600</string>
        <key>沙坪坝</key>
        <string>101043700</string>
        <key>永川</key>
        <string>101040200</string>
        <key>福州</key>
        <string>101230101</string>
        <key>泉州</key>
        <string>101230501</string>
        <key>漳州</key>
        <string>101230601</string>
        <key>龙岩</key>
        <string>101230701</string>
        <key>晋江</key>
        <string>101230509</string>
        <key>南平</key>
        <string>101230901</string>
        <key>厦门</key>
        <string>101230201</string>
        <key>宁德</key>
        <string>101230301</string>
        <key>莆田</key>
        <string>101230401</string>
        <key>三明</key>
        <string>101230801</string>
        <key>兰州</key>
        <string>101160101</string>
        <key>平凉</key>
        <string>101160301</string>
        <key>庆阳</key>
        <string>101160401</string>
        <key>武威</key>
        <string>101160501</string>
        <key>金昌</key>
        <string>101160601</string>
        <key>嘉峪关</key>
        <string>101161401</string>
        <key>酒泉</key>
        <string>101160801</string>
        <key>天水</key>
        <string>101160901</string>
        <key>武都</key>
        <string>101161001</string>
        <key>临夏</key>
        <string>101161101</string>
        <key>合作</key>
        <string>101161201</string>
        <key>白银</key>
        <string>101161301</string>
        <key>定西</key>
        <string>101160201</string>
        <key>张掖</key>
        <string>101160701</string>
        <key>广州</key>
        <string>101280101</string>
        <key>惠州</key>
        <string>101280301</string>
        <key>梅州</key>
        <string>101280401</string>
        <key>汕头</key>
        <string>101280501</string>
        <key>深圳</key>
        <string>101280601</string>
        <key>珠海</key>
        <string>101280701</string>
        <key>佛山</key>
        <string>101280800</string>
        <key>肇庆</key>
        <string>101280901</string>
        <key>湛江</key>
        <string>101281001</string>
        <key>江门</key>
        <string>101281101</string>
        <key>河源</key>
        <string>101281201</string>
        <key>清远</key>
        <string>101281301</string>
        <key>云浮</key>
        <string>101281401</string>
        <key>潮州</key>
        <string>101281501</string>
        <key>东莞</key>
        <string>101281601</string>
        <key>中山</key>
        <string>101281701</string>
        <key>阳江</key>
        <string>101281801</string>
        <key>揭阳</key>
        <string>101281901</string>
        <key>茂名</key>
        <string>101282001</string>
        <key>汕尾</key>
        <string>101282101</string>
        <key>韶关</key>
        <string>101280201</string>
        <key>南宁</key>
        <string>101300101</string>
        <key>柳州</key>
        <string>101300301</string>
        <key>来宾</key>
        <string>101300401</string>
        <key>桂林</key>
        <string>101300501</string>
        <key>梧州</key>
        <string>101300601</string>
        <key>防城港</key>
        <string>101301401</string>
        <key>贵港</key>
        <string>101300801</string>
        <key>玉林</key>
        <string>101300901</string>
        <key>百色</key>
        <string>101301001</string>
        <key>钦州</key>
        <string>101301101</string>
        <key>河池</key>
        <string>101301201</string>
        <key>北海</key>
        <string>101301301</string>
        <key>崇左</key>
        <string>101300201</string>
        <key>贺州</key>
        <string>101300701</string>
        <key>贵阳</key>
        <string>101260101</string>
        <key>安顺</key>
        <string>101260301</string>
        <key>都匀</key>
        <string>101260401</string>
        <key>兴义</key>
        <string>101260906</string>
        <key>铜仁</key>
        <string>101260601</string>
        <key>毕节</key>
        <string>101260701</string>
        <key>六盘水</key>
        <string>101260801</string>
        <key>遵义</key>
        <string>101260201</string>
        <key>凯里</key>
        <string>101260501</string>
        <key>昆明</key>
        <string>101290101</string>
        <key>红河</key>
        <string>101290301</string>
        <key>文山</key>
        <string>101290601</string>
        <key>玉溪</key>
        <string>101290701</string>
        <key>楚雄</key>
        <string>101290801</string>
        <key>普洱</key>
        <string>101290901</string>
        <key>昭通</key>
        <string>101291001</string>
        <key>临沧</key>
        <string>101291101</string>
        <key>怒江</key>
        <string>101291201</string>
        <key>香格里拉</key>
        <string>101291301</string>
        <key>丽江</key>
        <string>101291401</string>
        <key>德宏</key>
        <string>101291501</string>
        <key>景洪</key>
        <string>101291601</string>
        <key>大理</key>
        <string>101290201</string>
        <key>曲靖</key>
        <string>101290401</string>
        <key>保山</key>
        <string>101290501</string>
        <key>呼和浩特</key>
        <string>101080101</string>
        <key>乌海</key>
        <string>101080301</string>
        <key>集宁</key>
        <string>101080401</string>
        <key>通辽</key>
        <string>101080501</string>
        <key>阿拉善左旗</key>
        <string>101081201</string>
        <key>鄂尔多斯</key>
        <string>101080701</string>
        <key>临河</key>
        <string>101080801</string>
        <key>锡林浩特</key>
        <string>101080901</string>
        <key>呼伦贝尔</key>
        <string>101081000</string>
        <key>乌兰浩特</key>
        <string>101081101</string>
        <key>包头</key>
        <string>101080201</string>
        <key>赤峰</key>
        <string>101080601</string>
        <key>南昌</key>
        <string>101240101</string>
        <key>上饶</key>
        <string>101240301</string>
        <key>抚州</key>
        <string>101240401</string>
        <key>宜春</key>
        <string>101240501</string>
        <key>鹰潭</key>
        <string>101241101</string>
        <key>赣州</key>
        <string>101240701</string>
        <key>景德镇</key>
        <string>101240801</string>
        <key>萍乡</key>
        <string>101240901</string>
        <key>新余</key>
        <string>101241001</string>
        <key>九江</key>
        <string>101240201</string>
        <key>吉安</key>
        <string>101240601</string>
        <key>武汉</key>
        <string>101200101</string>
        <key>黄冈</key>
        <string>101200501</string>
        <key>荆州</key>
        <string>101200801</string>
        <key>宜昌</key>
        <string>101200901</string>
        <key>恩施</key>
        <string>101201001</string>
        <key>十堰</key>
        <string>101201101</string>
        <key>神农架</key>
        <string>101201201</string>
        <key>随州</key>
        <string>101201301</string>
        <key>荆门</key>
        <string>101201401</string>
        <key>天门</key>
        <string>101201501</string>
        <key>仙桃</key>
        <string>101201601</string>
        <key>潜江</key>
        <string>101201701</string>
        <key>襄樊</key>
        <string>101200201</string>
        <key>鄂州</key>
        <string>101200301</string>
        <key>孝感</key>
        <string>101200401</string>
        <key>黄石</key>
        <string>101200601</string>
        <key>咸宁</key>
        <string>101200701</string>
        <key>成都</key>
        <string>101270101</string>
        <key>自贡</key>
        <string>101270301</string>
        <key>绵阳</key>
        <string>101270401</string>
        <key>南充</key>
        <string>101270501</string>
        <key>达州</key>
        <string>101270601</string>
        <key>遂宁</key>
        <string>101270701</string>
        <key>广安</key>
        <string>101270801</string>
        <key>巴中</key>
        <string>101270901</string>
        <key>泸州</key>
        <string>101271001</string>
        <key>宜宾</key>
        <string>101271101</string>
        <key>内江</key>
        <string>101271201</string>
        <key>资阳</key>
        <string>101271301</string>
        <key>乐山</key>
        <string>101271401</string>
        <key>眉山</key>
        <string>101271501</string>
        <key>凉山</key>
        <string>101271601</string>
        <key>雅安</key>
        <string>101271701</string>
        <key>甘孜</key>
        <string>101271801</string>
        <key>阿坝</key>
        <string>101271901</string>
        <key>德阳</key>
        <string>101272001</string>
        <key>广元</key>
        <string>101272101</string>
        <key>攀枝花</key>
        <string>101270201</string>
        <key>银川</key>
        <string>101170101</string>
        <key>中卫</key>
        <string>101170501</string>
        <key>固原</key>
        <string>101170401</string>
        <key>石嘴山</key>
        <string>101170201</string>
        <key>吴忠</key>
        <string>101170301</string>
        <key>西宁</key>
        <string>101150101</string>
        <key>黄南</key>
        <string>101150301</string>
        <key>海北</key>
        <string>101150801</string>
        <key>果洛</key>
        <string>101150501</string>
        <key>玉树</key>
        <string>101150601</string>
        <key>海西</key>
        <string>101150701</string>
        <key>海东</key>
        <string>101150201</string>
        <key>海南</key>
        <string>101150401</string>
        <key>济南</key>
        <string>101120101</string>
        <key>潍坊</key>
        <string>101120601</string>
        <key>临沂</key>
        <string>101120901</string>
        <key>菏泽</key>
        <string>101121001</string>
        <key>滨州</key>
        <string>101121101</string>
        <key>东营</key>
        <string>101121201</string>
        <key>威海</key>
        <string>101121301</string>
        <key>枣庄</key>
        <string>101121401</string>
        <key>日照</key>
        <string>101121501</string>
        <key>莱芜</key>
        <string>101121601</string>
        <key>聊城</key>
        <string>101121701</string>
        <key>青岛</key>
        <string>101120201</string>
        <key>淄博</key>
        <string>101120301</string>
        <key>德州</key>
        <string>101120401</string>
        <key>烟台</key>
        <string>101120501</string>
        <key>济宁</key>
        <string>101120701</string>
        <key>泰安</key>
        <string>101120801</string>
        <key>西安</key>
        <string>101110101</string>
        <key>延安</key>
        <string>101110300</string>
        <key>榆林</key>
        <string>101110401</string>
        <key>铜川</key>
        <string>101111001</string>
        <key>商洛</key>
        <string>101110601</string>
        <key>安康</key>
        <string>101110701</string>
        <key>汉中</key>
        <string>101110801</string>
        <key>宝鸡</key>
        <string>101110901</string>
        <key>咸阳</key>
        <string>101110200</string>
        <key>渭南</key>
        <string>101110501</string>
        <key>太原</key>
        <string>101100101</string>
        <key>临汾</key>
        <string>101100701</string>
        <key>运城</key>
        <string>101100801</string>
        <key>朔州</key>
        <string>101100901</string>
        <key>忻州</key>
        <string>101101001</string>
        <key>长治</key>
        <string>101100501</string>
        <key>大同</key>
        <string>101100201</string>
        <key>阳泉</key>
        <string>101100301</string>
        <key>晋中</key>
        <string>101100401</string>
        <key>晋城</key>
        <string>101100601</string>
        <key>吕梁</key>
        <string>101101100</string>
        <key>乌鲁木齐</key>
        <string>101130101</string>
        <key>石河子</key>
        <string>101130301</string>
        <key>昌吉</key>
        <string>101130401</string>
        <key>吐鲁番</key>
        <string>101130501</string>
        <key>库尔勒</key>
        <string>101130601</string>
        <key>阿拉尔</key>
        <string>101130701</string>
        <key>阿克苏</key>
        <string>101130801</string>
        <key>喀什</key>
        <string>101130901</string>
        <key>伊宁</key>
        <string>101131001</string>
        <key>塔城</key>
        <string>101131101</string>
        <key>哈密</key>
        <string>101131201</string>
        <key>和田</key>
        <string>101131301</string>
        <key>阿勒泰</key>
        <string>101131401</string>
        <key>阿图什</key>
        <string>101131501</string>
        <key>博乐</key>
        <string>101131601</string>
        <key>克拉玛依</key>
        <string>101130201</string>
        <key>拉萨</key>
        <string>101140101</string>
        <key>山南</key>
        <string>101140301</string>
        <key>阿里</key>
        <string>101140701</string>
        <key>昌都</key>
        <string>101140501</string>
        <key>那曲</key>
        <string>101140601</string>
        <key>日喀则</key>
        <string>101140201</string>
        <key>林芝</key>
        <string>101140401</string>
        <key>台北县</key>
        <string>101340101</string>
        <key>高雄</key>
        <string>101340201</string>
        <key>台中</key>
        <string>101340401</string>
        <key>海口</key>
        <string>101310101</string>
        <key>三亚</key>
        <string>101310201</string>
        <key>东方</key>
        <string>101310202</string>
        <key>临高</key>
        <string>101310203</string>
        <key>澄迈</key>
        <string>101310204</string>
        <key>儋州</key>
        <string>101310205</string>
        <key>昌江</key>
        <string>101310206</string>
        <key>白沙</key>
        <string>101310207</string>
        <key>琼中</key>
        <string>101310208</string>
        <key>定安</key>
        <string>101310209</string>
        <key>屯昌</key>
        <string>101310210</string>
        <key>琼海</key>
        <string>101310211</string>
        <key>文昌</key>
        <string>101310212</string>
        <key>保亭</key>
        <string>101310214</string>
        <key>万宁</key>
        <string>101310215</string>
        <key>陵水</key>
        <string>101310216</string>
        <key>西沙</key>
        <string>101310217</string>
        <key>南沙岛</key>
        <string>101310220</string>
        <key>乐东</key>
        <string>101310221</string>
        <key>五指山</key>
        <string>101310222</string>
        <key>琼山</key>
        <string>101310102</string>
        <key>长沙</key>
        <string>101250101</string>
        <key>株洲</key>
        <string>101250301</string>
        <key>衡阳</key>
        <string>101250401</string>
        <key>郴州</key>
        <string>101250501</string>
        <key>常德</key>
        <string>101250601</string>
        <key>益阳</key>
        <string>101250700</string>
        <key>娄底</key>
        <string>101250801</string>
        <key>邵阳</key>
        <string>101250901</string>
        <key>岳阳</key>
        <string>101251001</string>
        <key>张家界</key>
        <string>101251101</string>
        <key>怀化</key>
        <string>101251201</string>
        <key>黔阳</key>
        <string>101251301</string>
        <key>永州</key>
        <string>101251401</string>
        <key>吉首</key>
        <string>101251501</string>
        <key>湘潭</key>
        <string>101250201</string>
        <key>南京</key>
        <string>101190101</string>
        <key>镇江</key>
        <string>101190301</string>
        <key>苏州</key>
        <string>101190401</string>
        <key>南通</key>
        <string>101190501</string>
        <key>扬州</key>
        <string>101190601</string>
        <key>宿迁</key>
        <string>101191301</string>
        <key>徐州</key>
        <string>101190801</string>
        <key>淮安</key>
        <string>101190901</string>
        <key>连云港</key>
        <string>101191001</string>
        <key>常州</key>
        <string>101191101</string>
        <key>泰州</key>
        <string>101191201</string>
        <key>无锡</key>
        <string>101190201</string>
        <key>盐城</key>
        <string>101190701</string>
        <key>哈尔滨</key>
        <string>101050101</string>
        <key>牡丹江</key>
        <string>101050301</string>
        <key>佳木斯</key>
        <string>101050401</string>
        <key>绥化</key>
        <string>101050501</string>
        <key>黑河</key>
        <string>101050601</string>
        <key>双鸭山</key>
        <string>101051301</string>
        <key>伊春</key>
        <string>101050801</string>
        <key>大庆</key>
        <string>101050901</string>
        <key>七台河</key>
        <string>101051002</string>
        <key>鸡西</key>
        <string>101051101</string>
        <key>鹤岗</key>
        <string>101051201</string>
        <key>齐齐哈尔</key>
        <string>101050201</string>
        <key>大兴安岭</key>
        <string>101050701</string>
        <key>长春</key>
        <string>101060101</string>
        <key>延吉</key>
        <string>101060301</string>
        <key>四平</key>
        <string>101060401</string>
        <key>白山</key>
        <string>101060901</string>
        <key>白城</key>
        <string>101060601</string>
        <key>辽源</key>
        <string>101060701</string>
        <key>松原</key>
        <string>101060801</string>
        <key>吉林</key>
        <string>101060201</string>
        <key>通化</key>
        <string>101060501</string>
        <key>沈阳</key>
        <string>101070101</string>
        <key>鞍山</key>
        <string>101070301</string>
        <key>抚顺</key>
        <string>101070401</string>
        <key>本溪</key>
        <string>101070501</string>
        <key>丹东</key>
        <string>101070601</string>
        <key>葫芦岛</key>
        <string>101071401</string>
        <key>营口</key>
        <string>101070801</string>
        <key>阜新</key>
        <string>101070901</string>
        <key>辽阳</key>
        <string>101071001</string>
        <key>铁岭</key>
        <string>101071101</string>
        <key>盘锦</key>
        <string>101071301</string>
        <key>大连</key>
        <string>101070201</string>
        <key>锦州</key>
        <string>101070701</string>
        
    </dict>
</plist>

4. 删除默认的View，添加TableView,前面几篇都有介绍，下面是属性的配置

 

5. 添加myDataViewController类文件

 5.1 修改 myDataViewController.h

myDataViewController.h

 1  //
 2  //   myDataViewController.h
 3  //   listCityWeather
 4  //
 5  //   Created by tony on 12-9-6.
 6  //   Copyright (c) 2012年 chinapcc.com. All rights reserved.
 7  //
 8 
 9  #import <UIKit/UIKit.h>
10  #import  " NSDictionary+Json.h "
11 
12  @interface myDataViewController : UITableViewController
13 {
14      //  当前的页数
15       int _index;
16     
17      //  每页大小
18       int _size;
19 }
20 
21  //  城市字典
22  @property NSDictionary *dictCity;
23 
24  //  所有天气预报的城市
25  @property NSArray *listCity;
26 
27  //  需要加载的城市
28  @property NSMutableArray *pagingCity;
29 
30 
31  @end

5.2 修改 myDataViewController.m 

视图加载

 1  @synthesize listCity;
 2  @synthesize dictCity;
 3  @synthesize pagingCity;
 4 
 5 - ( void)viewDidLoad
 6 {
 7     _index =  1;   //  初始化当前页
 8      _size =  10;   //  设置每页行数
 9      
10       //  获取data.plist路径
11      NSString *path = [[NSBundle mainBundle] pathForResource: @" data " ofType: @" plist "];
12     
13      //  读取文件内容到 NSDictionary
14      self.dictCity = [[NSDictionary alloc] initWithContentsOfFile:path];  
15     
16      //  把字典中Keys读到数组中
17      self.listCity = [[self.dictCity allKeys] sortedArrayUsingSelector:@selector(compare:)];
18     
19      //  初始化显示的数组
20      self.pagingCity = [[NSMutableArray alloc] init];
21     
22      //  把最前面的十个城市，存入要显示的数组中（这里没有考虑不够的情形，不能用于商业代码）
23       for ( int i= 0; i<_size; i++) {
24         [self.pagingCity addObject:[self.listCity objectAtIndex:i]];
25     }
26     [super viewDidLoad];
27 }
28 
29 - ( void)viewDidUnload
30 {
31     [super viewDidUnload];
32     self.listCity = nil;
33     self.dictCity = nil;
34     self.pagingCity = nil;
35 }

 

 1

数据源绑定

 1 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
 2 {
 3      return  1;
 4 }
 5 
 6 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
 7 {
 8      return [self.pagingCity count]+ 1;
 9 }
10 
11 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
12 {
13      static NSString *CellIdentifier =  @" Cell ";
14     UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
15     
16      //  如果是最后一行，则显示加载更多，或是提示已加载完全
17       if([indexPath row] == ([pagingCity count])) {
18          if (indexPath.row == listCity.count)
19         {
20             cell.textLabel.text= @" 已加载所有城市！ ";
21             cell.detailTextLabel.text =  @"   ";
22         }
23          else{
24             cell.textLabel.text= @" 加载更多.. ";
25             cell.detailTextLabel.text =  @"  猛点，可以加载下面十个城市！ ";
26         }
27         cell.accessoryType = UITableViewCellAccessoryNone;
28     } else {
29          //  取出城市名称
30          NSString *title = [self.listCity objectAtIndex:indexPath.row];
31         
32          //  取出城城市代码
33          NSString *code = [self.dictCity objectForKey:title];
34         
35          //  设置Cell参数
36          cell.textLabel.text = title;
37         cell.detailTextLabel.text = [[NSString alloc] initWithFormat: @" code: %@  ", code];
38         cell.accessoryType = UITableViewCellAccessoryDetailDisclosureButton;
39     }
40      return cell;
41 }

 

加载事件

  1  //  到最后一行，自动加载数据
  2  -( void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
  3 {
  4      if (indexPath.row == [pagingCity count])
  5     {
  6         NSLog( @"  index path:%d ",indexPath.row);
  7         
  8          //  自动加载，在这里没有打开，如果打开，请把_size设置20或以上，效果才能好看
  9           // [self loadMoreEvent:tableView :indexPath];
 10      }
 11      return;
 12 }
 13 
 14  //  点击事件
 15  - ( void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
 16 {
 17      if (indexPath.row == [pagingCity count])
 18     {
 19         [self loadMoreEvent:tableView :indexPath];
 20     }
 21      else
 22     {
 23         NSString *title = [self.listCity objectAtIndex:indexPath.row];
 24         NSString *code = [self.dictCity objectForKey:title];
 25         NSString *url = [[NSString alloc] initWithFormat: @" http://m.weather.com.cn/data/%@.html ",code];
 26         
 27          //  把远程数据转成NSDictionary的数据
 28          NSDictionary *dict = [NSDictionary dictionaryWithContentsOfURLString:url];
 29         
 30          //  获取天气温详细信息
 31          NSDictionary *weather = [dict objectForKey: @" weatherinfo "];
 32         NSString *date = [weather objectForKey: @" date_y "];
 33         NSString *week = [weather objectForKey: @" week "];
 34         NSString *wd = [weather objectForKey: @" temp1 "];
 35         NSString *tq = [weather objectForKey: @" weather1 "];
 36         NSString *city = [weather objectForKey: @" city "];
 37         NSString *jy = [weather objectForKey: @" index_d "];
 38         
 39         NSString *msg = [[NSString alloc] initWithFormat: @" 城市：%@ \r 时间：%@ %@ \r 温度：%@ \r 天气：%@ \r 建议：%@ ",city,date,week,wd,tq,jy];
 40         
 41         UIAlertView *alert= [[UIAlertView alloc] initWithTitle:title message:msg  delegate:self cancelButtonTitle: @" OK " otherButtonTitles:nil, nil];
 42         [alert show];
 43     }
 44 }
 45  //  加载更多的事件
 46  -( void)loadMoreEvent:(UITableView *)tableView :(NSIndexPath *)indexPath
 47 {
 48      int page = ( int)(listCity.count/_size);
 49      if (([self.listCity count]%_size)> 0)
 50         page ++;
 51      if (_index<page)
 52     {
 53         NSLog( @"  listCity count:%d size:%d page:%d index:%d  ",listCity.count,_size,page,_index);
 54         
 55         UITableViewCell *loadMoreCell = [tableView cellForRowAtIndexPath:indexPath];
 56         _index ++;
 57         loadMoreCell.textLabel.text =  @" 正在加载中... ";
 58         loadMoreCell.detailTextLabel.text =  @"";
 59         [self performSelectorInBackground:@selector(loadMore) withObject:nil];
 60         [tableView deselectRowAtIndexPath:indexPath animated:YES];
 61     }
 62      return;
 63 }
 64 
 65  //  加载更多数据，此处可以换成从远程服务器获取最新的_size条数据
 66  -( void)loadMore
 67 {
 68     NSMutableArray *more;
 69     more = [[NSMutableArray alloc] initWithCapacity: 0];
 70      int begin = (_index- 1)*_size;
 71      int end = begin+_size;
 72      if (end>[listCity count])
 73         end = [listCity count];
 74     
 75      for ( int i=begin; i<end; i++) {
 76         [more addObject:[listCity objectAtIndex:i]];
 77     }
 78     [self performSelectorOnMainThread:@selector(appendTableWith:) withObject:more waitUntilDone:NO];
 79     
 80 }
 81 
 82  //  添加数据到当前TableView中去
 83  -( void) appendTableWith:(NSMutableArray *)data
 84 {
 85      //  添加到当前的数据源中
 86       for ( int i= 0; i<[data count]; i++) {
 87         [pagingCity addObject:[data objectAtIndex:i]];
 88     }
 89     
 90     NSMutableArray *insertIndexPaths = [NSMutableArray arrayWithCapacity:[data count]];
 91      for( int ind = 0;ind<[data count];ind++)
 92     {
 93         NSIndexPath *newPath = [NSIndexPath indexPathForRow:[pagingCity indexOfObject:[data objectAtIndex:ind]] inSection: 0];
 94         [insertIndexPaths addObject:newPath];
 95     }
 96     [self.tableView insertRowsAtIndexPaths:insertIndexPaths withRowAnimation:UITableViewRowAnimationFade];
 97     
 98      //  选到当前的行数
 99       int begin = (_index- 1)*_size;
100     NSIndexPath *indexPath = [NSIndexPath indexPathForRow:begin inSection: 0];
101     [self.tableView selectRowAtIndexPath:indexPath  animated:YES scrollPosition:UITableViewScrollPositionTop];
102     
103

 

6. myDataViewController 与UITableView 绑定

 

7. 完成，看效果

 

 

8. 按国际惯例，附上：源代码