使用 AFNetworking 进行 XML 和 JSON 数据请求

（1）XML 数据请求

使用 AFNetworking 中的 AFHTTPRequestOperation 和 AFXMLParserResponseSerializer，另外结合第三方框架 XMLDictionary 进行数据转换

使用 XMLDictionary 的好处：有效避免自行实现 NSXMLParserDelegate 委托代理协议方法来进行繁琐的数据拼凑解析

（2）JSON 数据请求

使用 AFNetworking 中的 AFHTTPRequestOperation 或 AFHTTPRequestOperationManager，另外在图片缓存方面可选的方案有：

• 使用 AFNetworking 中 的 UIImageView+AFNetworking

• 使用第三方框架 SDWebImage 的 UIImageView+WebCache

效果如下：

XML 数据格式：

请求网址：http://www.webxml.com.cn/WebServices/WeatherWebService.asmx/getWeatherbyCityName?theCityName=59287

 <ArrayOfString xmlns="http://WebXml.com.cn/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
     <string>
         广东
     </string>
     <string>
         广州
     </string>
     <string>
         59287
     </string>
     <string>
         59287.jpg
     </string>
     <string>
         2015-9-19 17:30:31
     </string>
     <string>
         25℃/32℃
     </string>
     <string>
         9月19日 多云转中雨
     </string>
     <string>
         无持续风向微风
     </string>
     <string>
         1.gif
     </string>
     <string>
         8.gif
     </string>
     <string>
         今日天气实况：气温：31℃；风向/风力：西南风 1级；湿度：62%；空气质量：暂无；紫外线强度：弱
     </string>
     <string>
         太阳镜指数：必要。建议佩戴透射比为1级的浅色太阳镜。
 穿衣指数：炎热。建议穿短衫、短裤等清凉夏季服装。
 旅游指数：适宜。微风，虽天气稍热，但不会影响心情。
 运动指数：较适宜。户外运动请注意防晒。
 洗车指数：不宜。有雨，雨水和泥水会弄脏爱车。
 化妆指数：防脱水。请选用防脱水化妆品。
 感冒指数：少发。感冒机率较低，避免长期处于空调屋中。
 空气污染指数：暂无。
 紫外线指数：弱。辐射较弱，涂擦SPF12-15、PA+护肤品。
 舒适度指数：较不舒适。多云，有些热。
     </string>
     <string>
         25℃/29℃
     </string>
     <string>
         9月20日 中雨转中到大雨
     </string>
     <string>
         无持续风向微风
     </string>
     <string>
         8.gif
     </string>
     <string>
         22.gif
     </string>
     <string>
         24℃/29℃
     </string>
     <string>
         9月21日 中到大雨转雷阵雨
     </string>
     <string>
         无持续风向微风
     </string>
     <string>
         22.gif
     </string>
     <string>
         4.gif
     </string>
     <string>
         广州是广东省的省会,是中国南方最大的海滨城市，广州位于东经113。17`，北纬23。8`，地处中国大陆南部，广东省南部，珠江三角洲北缘。广州临南海，邻近香港特别行政区，是中国通往世界的南大门，广州属丘陵地带。中国的第三大河----珠江从广州市中心穿流而过。广州是一座历史文化名城。相传在远古时候，曾有五位仙人，身穿五色彩服、骑着嘴衔稻穗的五色仙羊降临此地，把稻穗赠给百姓，祝愿这里永无饥荒。从此，广州便有“羊城”、“穗城”的美称，“五羊”也成为广州的象征。广州既是中国也是世界名城，又是一座古城，因历史上有五羊仙子降临献稻穗的故事，广州又称为“羊城”和“穗城”，简称“穗”；广州一年四季如春、繁花似锦，除夕迎春花市闻名海内外，故又有“花城”的美誉。广州地处低纬,属南亚热带季风气候区。地表接受太阳辐射量较多，同时受季风的影响,夏季海洋暖气流形成高温、高湿、多雨的气候；冬季北方大陆冷风形成低温、干燥、少雨的气候。年平均气温为21.4-21.9度，年降雨量平均为1623.6-1899.8mm，北部多于南部。1982年，广州被国务院选定为全国首批历史文化名城之一，是我国重点旅游城市。1999年1月，广州被评为优秀旅游城市。景观：白云山、莲花山、南海神庙、佛山祖庙、广州动物园等。
     </string>
 </ArrayOfString>

JSON 数据格式：

请求网址：https://alpha-api.app.net/stream/0/posts/stream/global

 {
     "data": [
         {
             "canonical_url": "https://alpha.app.net/hasskod2013/post/64791677",
             "created_at": "2015-09-19T11:23:30Z",
             "entities": {
                 "hashtags": [
                 ],
                 "links": [
                     {
                         "len": 21,
                         "pos": 163,
                         "text": "http://bit.ly/1Ynt5DC",
                         "url": "http://bit.ly/1Ynt5DC"
                     }
                 ],
                 "mentions": [
                 ]
             },
             "html": "<span itemscope=\"https://app.net/schemas/Post\">Oman says ambassador's home hit in Yemen: Foreign ministry condemns incident in Sanaa as Arab coalition bombards Houthi-held sites as part of move to retake city. <a href=\"http://bit.ly/1Ynt5DC\">http://bit.ly/1Ynt5DC</a></span>",
             "id": "64791677",
             "machine_only": false,
             "num_replies": 0,
             "num_reposts": 0,
             "num_stars": 0,
             "pagination_id": "64791677",
             "source": {
                 "client_id": "8dWzbxxwZeTTAH3v7Yy9TbJ82W6mexqH",
                 "link": "http://twitterfeed.com",
                 "name": "twitterfeed"
             },
             "text": "Oman says ambassador's home hit in Yemen: Foreign ministry condemns incident in Sanaa as Arab coalition bombards Houthi-held sites as part of move to retake city. http://bit.ly/1Ynt5DC",
             "thread_id": "64791677",
             "user": {
                 "avatar_image": {
                     "height": 80,
                     "is_default": false,
                     "url": "https://d2rfichhc2fb9n.cloudfront.net/image/5/8crtOD1QaZ4b0uA6GnTQQMVTgJJ7InMiOiJzMyIsImIiOiJhZG4tdXNlci1hc3NldHMiLCJrIjoiYXNzZXRzL3VzZXIvMjMvZmIvNTAvMjNmYjUwMDAwMDAwMDAwMC5wbmciLCJvIjoiIn0",
                     "width": 80
                 },
                 "canonical_url": "https://alpha.app.net/hasskod2013",
                 "counts": {
                     "followers": 16,
                     "following": 33,
                     "posts": 11722,
                     "stars": 0
                 },
                 "cover_image": {
                     "height": 260,
                     "is_default": true,
                     "url": "https://d2rfichhc2fb9n.cloudfront.net/image/5/kZ-JRmTbmd3WVPswTJ8Nwxzkf917InMiOiJzMyIsImIiOiJ0YXBwLWFzc2V0cyIsImsiOiJpL1UvaS9ZL1VpWW5xRFNvTUtyTEhLNXA0OHN2NkxmTmRVMC5qcGciLCJvIjoiIn0",
                     "width": 960
                 },
                 "created_at": "2013-08-28T11:18:40Z",
                 "id": "155975",
                 "locale": "ar_AA",
                 "name": "hasskod",
                 "timezone": "Asia/Baghdad",
                 "type": "feed",
                 "username": "hasskod2013"
             }
         },
         //同样格式的19个数组元素内容，这里省略...
     ],
     "meta": {
         "code": 200,
         "max_id": "64791677",
         "min_id": "64791658",
         "more": true
     }
 }

ViewController.h

 #import <UIKit/UIKit.h>

 @interface ViewController : UITableViewController
 @property (copy, nonatomic) NSArray *arrSampleName;

 - (instancetype)initWithSampleNameArray:(NSArray *)arrSampleName;

 @end 

ViewController.m

 #import "ViewController.h"
 #import "XMLRequestViewController.h"
 #import "JSONRequestViewController.h"

 @interface ViewController ()
 - (void)layoutUI;
 @end

 @implementation ViewController
 - (void)viewDidLoad {
     [super viewDidLoad];

     [self layoutUI];
 }

 - (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
 }

 - (instancetype)initWithSampleNameArray:(NSArray *)arrSampleName {
     if (self = [super initWithStyle:UITableViewStyleGrouped]) {
         self.navigationItem.title = @"使用 AFNetworking 进行数据请求";
         self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"返回" style:UIBarButtonItemStylePlain target:nil action:nil];

         _arrSampleName = arrSampleName;
     }
     return self;
 }

 - (void)layoutUI {

 }

 #pragma mark - UITableViewController相关方法重写
 - (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {
     return 0.1;
 }

 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
     return ;
 }

 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
     return [_arrSampleName count];
 }

 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
     static NSString *cellIdentifier = @"cell";
     UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
     if (!cell) {
         cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
     }
     cell.textLabel.text = _arrSampleName[indexPath.row];
     return cell;
 }

 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
     switch (indexPath.row) {
         case : {
             XMLRequestViewController *XMLRequestVC = [XMLRequestViewController new];
             [self.navigationController pushViewController:XMLRequestVC animated:YES];
             break;
         }
         case : {
             JSONRequestViewController *JSONRequestVC = [JSONRequestViewController new];
             [self.navigationController pushViewController:JSONRequestVC animated:YES];
             break;

             /*
              类似堆栈的先进后出的原理：
              返回到（上一级）、（任意级）、（根级）导航
              [self.navigationController popViewControllerAnimated:YES];
              [self.navigationController popToViewController:thirdSampleVC animated:YES];
              [self.navigationController popToRootViewControllerAnimated:YES];
              */
         }
         default:
             break;
     }
 }

 @end 

PrefixHeader.pch

 #define kXMLRequestURLStr @"http://www.webxml.com.cn/WebServices/WeatherWebService.asmx/getWeatherbyCityName?theCityName=59287"
 #define kJSONRequestURLStr @"https://alpha-api.app.net/stream/0/posts/stream/global"

 #define kTitleOfXMLRequest @"XML 数据请求"
 #define kTitleOfJSONRequest @"JSON 数据请求"

 #define kAvatarImageStr @"avatarImageStr"
 #define kName @"name"
 #define kText @"text"
 #define kLink @"link"
 #define kCreatedAt @"createdAt"

 #define kApplication [UIApplication sharedApplication] 

UIButton+BeautifulButton.h

 #import <UIKit/UIKit.h>

 @interface UIButton (BeautifulButton)
 /**
  *  根据按钮文字颜色，返回对应文字颜色的圆角按钮
  *
  *  @param tintColor 按钮文字颜色；nil 的话就为深灰色
  */
 - (void)beautifulButton:(UIColor *)tintColor;

 @end 

UIButton+BeautifulButton.m

 #import "UIButton+BeautifulButton.h"

 @implementation UIButton (BeautifulButton)

 - (void)beautifulButton:(UIColor *)tintColor {
     self.tintColor = tintColor ?: [UIColor darkGrayColor];
     self.layer.masksToBounds = YES;
     self.layer.cornerRadius = 10.0;
     self.layer.borderColor = [UIColor grayColor].CGColor;
     self.layer.borderWidth = 1.0;
 }

 @end 

NSString+OpenURL.h

 #import <UIKit/UIKit.h>

 @interface NSString (OpenURL)
 /**
  *  打开浏览器
  */
 - (void)openByBrowser;

 /**
  *  打开邮件
  */
 - (void)openByEmail;

 /**
  *  拨打电话
  */
 - (void)openByTelephone;

 /**
  *  打开短信（Short Messaging Service）
  */
 - (void)openBySMS;

 @end 

NSString+OpenURL.m

 #import "NSString+OpenURL.h"

 @implementation NSString (OpenURL)

 + (void)open:(NSString *)openURLStr {
     [[UIApplication sharedApplication] openURL:[NSURL URLWithString:openURLStr]];
 }

 - (void)openByBrowser {
     [NSString open:self];
 }

 - (void)openByEmail {
     [NSString open:[NSString stringWithFormat:@"mailto://%@", self]];
 }

 - (void)openByTelephone {
     [NSString open:[NSString stringWithFormat:@"tel://%@", self]];
 }

 - (void)openBySMS {
     [NSString open:[NSString stringWithFormat:@"sms://%@", self]];
 }

 @end 

KMTableViewCell.h

 #import <UIKit/UIKit.h>

 @interface KMTableViewCell : UITableViewCell
 @property (strong, nonatomic) IBOutlet UIImageView *imgVAvatarImage;
 @property (strong, nonatomic) IBOutlet UILabel *lblName;
 @property (strong, nonatomic) IBOutlet UILabel *lblCreatedAt;
 @property (strong, nonatomic) IBOutlet UIImageView *imgVLink;

 @property (strong, nonatomic) UILabel *lblText;
 @property (copy, nonatomic) NSString *avatarImageStr;
 @property (copy, nonatomic) NSString *name;
 @property (copy, nonatomic) NSString *text;
 @property (copy, nonatomic) NSString *createdAt;
 @property (assign, nonatomic, getter=isHaveLink) BOOL haveLink;

 @end 

KMTableViewCell.m

 #import "KMTableViewCell.h"
 //#import "UIImageView+AFNetworking.h"
 #import "UIImageView+WebCache.h"

 static UIImage *placeholderImage;
 static CGFloat widthOfLabel;
 @implementation KMTableViewCell

 - (void)awakeFromNib {
     // Initialization code
     static dispatch_once_t onceToken;
     dispatch_once(&onceToken, ^{
         placeholderImage = [UIImage imageNamed:@"JSON"];
         widthOfLabel = [[UIScreen mainScreen] bounds].size.width - 100.0;
     });

     _imgVAvatarImage.layer.masksToBounds = YES;
     _imgVAvatarImage.layer.cornerRadius = 10.0;

     //由于 xib 中对标签自适应宽度找不到合适的方式来控制，所以这里用代码编写；这里屏幕复用的 Cell 有几个，就会执行几次 awakeFromNib 方法
     _lblText = [[UILabel alloc] initWithFrame:CGRectMake(90.0, 23.0, widthOfLabel, 42.0)];
     _lblText.numberOfLines = ;
     _lblText.font = [UIFont systemFontOfSize:12.0];
     [self addSubview:_lblText];
 }

 - (void)setSelected:(BOOL)selected animated:(BOOL)animated {
     [super setSelected:selected animated:animated];

     // Configure the view for the selected state
 }

 - (void)setAvatarImageStr:(NSString *)avatarImageStr {
     if (![_avatarImageStr isEqualToString:avatarImageStr]) {
         _avatarImageStr = [avatarImageStr copy];
         NSURL *avatarImageURL = [NSURL URLWithString:_avatarImageStr];
         //NSData *avatarImageData = [NSData dataWithContentsOfURL:avatarImageURL];
         //_imgVAvatarImage.image = [UIImage imageWithData:avatarImageData];

         //图片缓存；性能优化的第一步
         //方法一：AFNetworking 框架：UIImageView+AFNetworking
 //        [_imgVAvatarImage setImageWithURL:avatarImageURL
 //                         placeholderImage:placeholderImage];

         //方法二：SDWebImage 框架：UIImageView+WebCache
         [_imgVAvatarImage sd_setImageWithURL:avatarImageURL
                             placeholderImage:placeholderImage];
     }
 }

 - (void)setName:(NSString *)name {
     _name = [name copy];
     _lblName.text = _name;
 }

 - (void)setText:(NSString *)text {
     _text = [text copy];
     _lblText.text = _text;
 }

 - (void)setCreatedAt:(NSString *)createdAt {
     _createdAt = [createdAt copy];
     _lblCreatedAt.text = _createdAt;
 }

 - (void)setHaveLink:(BOOL)haveLink {
     _haveLink = haveLink;
     _imgVLink.hidden = !_haveLink;
 }

 @end 

KMTableViewCell.xib

 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="7706" systemVersion="14E46" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES">
     <dependencies>
         <deployment identifier="iOS"/>
         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="7703"/>
     </dependencies>
     <objects>
         <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner"/>
         <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
         <tableViewCell contentMode="scaleToFill" selectionStyle="default" indentationWidth="10" reuseIdentifier="cellIdentifier" rowHeight="101" id="KGk-i7-Jjw" customClass="KMTableViewCell">
             <rect key="frame" x="0.0" y="0.0" width="375" height="101"/>
             <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
             <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="KGk-i7-Jjw" id="H2p-sc-9uM">
                 <rect key="frame" x="0.0" y="0.0" width="320" height="43"/>
                 <autoresizingMask key="autoresizingMask"/>
                 <subviews>
                     <imageView userInteractionEnabled="NO" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="3Br-R7-YsD">
                         <rect key="frame" x="0.0" y="5" width="80" height="80"/>
                     </imageView>
                     <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="name" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="kPR-pa-8uG">
                         <rect key="frame" x="90" y="2" width="230" height="21"/>
                         <fontDescription key="fontDescription" type="boldSystem" pointSize="14"/>
                         <color key="textColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="calibratedRGB"/>
                         <nil key="highlightedColor"/>
                     </label>
                     <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="created_at" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="iAH-dO-aus">
                         <rect key="frame" x="90" y="64" width="130" height="21"/>
                         <fontDescription key="fontDescription" type="system" pointSize="12"/>
                         <color key="textColor" red="0.40000000596046448" green="0.40000000596046448" blue="0.40000000596046448" alpha="1" colorSpace="calibratedRGB"/>
                         <nil key="highlightedColor"/>
                     </label>
                     <imageView userInteractionEnabled="NO" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" image="Action_ReadOriginal" translatesAutoresizingMaskIntoConstraints="NO" id="By5-cw-IJd">
                         <rect key="frame" x="223" y="60" width="30" height="30"/>
                     </imageView>
                 </subviews>
             </tableViewCellContentView>
             <connections>
                 <outlet property="imgVAvatarImage" destination="3Br-R7-YsD" id="KaV-vS-y5p"/>
                 <outlet property="imgVLink" destination="By5-cw-IJd" id="wrr-zz-EqH"/>
                 <outlet property="lblCreatedAt" destination="iAH-dO-aus" id="BNF-es-fb1"/>
                 <outlet property="lblName" destination="kPR-pa-8uG" id="BH7-oj-3Kx"/>
             </connections>
             <point key="canvasLocation" x="254.5" y="377.5"/>
         </tableViewCell>
     </objects>
     <resources>
         <image name="Action_ReadOriginal" width="60" height="60"/>
     </resources>
 </document>

XMLRequestViewController.h

 #import <UIKit/UIKit.h>

 @interface XMLRequestViewController : UIViewController <NSXMLParserDelegate>
 @property (strong, nonatomic) UITextView *txtVResult;

 @property (strong, nonatomic) IBOutlet UIButton *btnSendRequest;

 @end 

XMLRequestViewController.m

 #import "XMLRequestViewController.h"
 #import "AFNetworking.h"
 #import "AFNetworkActivityIndicatorManager.h"
 #import "UIButton+BeautifulButton.h"
 #import "XMLDictionary.h"

 @interface XMLRequestViewController ()
 - (void)layoutUI;
 - (void)convertXMLParserToDictionary:(NSXMLParser *)parser;
 @end

 @implementation XMLRequestViewController

 - (void)viewDidLoad {
     [super viewDidLoad];

     [self layoutUI];
 }

 - (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
 }

 - (void)layoutUI {
     self.navigationItem.title = kTitleOfXMLRequest;

     [_btnSendRequest beautifulButton:nil];

     _txtVResult = [UITextView new];
     _txtVResult.editable = NO;
     CGRect rect = [[UIScreen mainScreen] bounds];
     _txtVResult.frame = CGRectMake(5.0, 64.0, rect.size.width - 10.0, rect.size.height - 164.0);
     _txtVResult.font = [UIFont systemFontOfSize:15.0];
     _txtVResult.text = @"点击「发送请求」按钮获取天气信息";
     [self.view addSubview:_txtVResult];

     //启动网络活动指示器；会根据网络交互情况，实时显示或隐藏网络活动指示器；他通过「通知与消息机制」来实现 [UIApplication sharedApplication].networkActivityIndicatorVisible 的控制
     [AFNetworkActivityIndicatorManager sharedManager].enabled = YES;
 }

 - (void)convertXMLParserToDictionary:(NSXMLParser *)parser {
     //dictionaryWithXMLParser: 是第三方框架 XMLDictionary 的方法
     NSDictionary *dic = [NSDictionary dictionaryWithXMLParser:parser];
     NSMutableString *mStrWeatherInfo = [[NSMutableString alloc] initWithString:@"广州近三天天气情况：\n"];
     NSArray *arrWeatherInfo = [dic objectForKey:@"string"];
     if (arrWeatherInfo != nil && arrWeatherInfo.count > ) {
         NSMutableArray *mArrRange = [[NSMutableArray alloc] init];

         NSUInteger loc = mStrWeatherInfo.length;
         [mStrWeatherInfo appendFormat:@"\n %@", arrWeatherInfo[]];
         NSUInteger len = mStrWeatherInfo.length - loc;
         NSValue *valObj = [NSValue valueWithRange:NSMakeRange(loc, len)];
         [mArrRange addObject:valObj];
         [mStrWeatherInfo appendFormat:@"\n %@", arrWeatherInfo[]];
         [mStrWeatherInfo appendFormat:@"\n %@", arrWeatherInfo[]];
         [mStrWeatherInfo appendFormat:@"\n %@", arrWeatherInfo[]];

         loc = mStrWeatherInfo.length;
         [mStrWeatherInfo appendFormat:@"\n\n %@", arrWeatherInfo[]];
         len = mStrWeatherInfo.length - loc;
         valObj = [NSValue valueWithRange:NSMakeRange(loc, len)];
         [mArrRange addObject:valObj];
         [mStrWeatherInfo appendFormat:@"\n %@", arrWeatherInfo[]];
         [mStrWeatherInfo appendFormat:@"\n %@", arrWeatherInfo[]];

         loc = mStrWeatherInfo.length;
         [mStrWeatherInfo appendFormat:@"\n\n %@", arrWeatherInfo[]];
         len = mStrWeatherInfo.length - loc;
         valObj = [NSValue valueWithRange:NSMakeRange(loc, len)];
         [mArrRange addObject:valObj];
         [mStrWeatherInfo appendFormat:@"\n %@", arrWeatherInfo[]];
         [mStrWeatherInfo appendFormat:@"\n %@", arrWeatherInfo[]];

         [mStrWeatherInfo appendFormat:@"\n\n %@", arrWeatherInfo[]];

         //数据的前10个字符以16.0像素加粗显示；这里使用 UITextView 的 attributedText，而他的 text 无法实现这种需求
         NSMutableAttributedString *mAttrStr = [[NSMutableAttributedString alloc] initWithString:mStrWeatherInfo];
         [mAttrStr addAttribute:NSFontAttributeName
                          value:[UIFont boldSystemFontOfSize:16.0]
                          range:NSMakeRange(, )];

         //数据的日期部分以紫色显示
         for (NSValue *valObj in mArrRange) {
             NSRange currentRange;
             [valObj getValue:&currentRange];
             [mAttrStr addAttribute:NSForegroundColorAttributeName
                              value:[UIColor purpleColor]
                              range:currentRange];
         }

         //数据的前10个字符之后的内容全部以15.0像素显示
         [mAttrStr addAttribute:NSFontAttributeName
                          value:[UIFont systemFontOfSize:15.0]
                          range:NSMakeRange(, mStrWeatherInfo.length - )];

         _txtVResult.attributedText = mAttrStr;
     } else {
         _txtVResult.text = @"请求数据无效";
     }

 }

 - (IBAction)sendRequest:(id)sender {
     NSURL *requestURL = [NSURL URLWithString:kXMLRequestURLStr];
     NSURLRequest *request = [NSURLRequest requestWithURL:requestURL];
     AFHTTPRequestOperation *op = [[AFHTTPRequestOperation alloc] initWithRequest:request];
     op.responseSerializer = [AFXMLParserResponseSerializer serializer];
     [op setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
         NSLog(@"JSON: %@", responseObject);
         NSXMLParser *parser = (NSXMLParser *)responseObject;
         //这里使用了第三方框架 XMLDictionary，他本身继承并实现 NSXMLParserDelegate 委托代理协议，对数据进行遍历处理
         [self convertXMLParserToDictionary:parser];

         //parser.delegate = self;
         //parser.shouldProcessNamespaces = YES;
         //[parser parse];
     } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
         NSLog(@"Error: %@", error);
     }];
     //start 是 AFNetworking 的自定义方法，他在自定义的线程中去执行操作；不是 NSOperation 对象实例的 start 方法，所以可以不用使用把操作添加到操作主队列的方法：[[NSOperationQueue mainQueue] addOperation:op]
     [op start];
 }

 #pragma mark -
 #pragma mark NSXMLParserDelegate
 /* 开始解析 XML 文件，在开始解析 XML 节点前，通过该方法可以做一些初始化工作 */
 - (void)parserDidStartDocument:(NSXMLParser *)parser {
     NSLog(@"开始解析 XML 文件");
 }

 /* 当解析器对象遇到 XML 的开始标记时，调用这个方法开始解析该节点 */
 - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
     attributes:(NSDictionary *)attributeDict {
     NSLog(@"发现节点：%@", elementName);
 }

 /* 当解析器找到开始标记和结束标记之间的字符时，调用这个方法解析当前节点的所有字符 */
 - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string {
     NSLog(@"正在解析节点内容：%@", string);
 }

 /* 当解析器对象遇到 XML 的结束标记时，调用这个方法完成解析该节点 */
 - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {
     NSLog(@"解析节点结束：%@", elementName);
 }

 /* 解析 XML 出错的处理方法 */
 - (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError {
     NSLog(@"解析 XML 出错：%@", parseError);
 }

 /* 解析 XML 文件结束 */
 - (void)parserDidEndDocument:(NSXMLParser *)parser {
     NSLog(@"解析 XML 文件结束");
 }

 @end 

XMLRequestViewController.xib

 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="7706" systemVersion="14E46" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES">
     <dependencies>
         <deployment identifier="iOS"/>
         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="7703"/>
     </dependencies>
     <objects>
         <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner" customClass="XMLRequestViewController">
             <connections>
                 <outlet property="btnSendRequest" destination="zCQ-LM-grx" id="tgt-2z-WaB"/>
                 <outlet property="view" destination="i5M-Pr-FkT" id="sfx-zR-JGt"/>
             </connections>
         </placeholder>
         <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
         <view clearsContextBeforeDrawing="NO" contentMode="scaleToFill" id="i5M-Pr-FkT">
             <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
             <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
             <subviews>
                 <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="zCQ-LM-grx">
                     <rect key="frame" x="250" y="520" width="100" height="40"/>
                     <constraints>
                         <constraint firstAttribute="width" constant="100" id="V3R-30-5vV"/>
                         <constraint firstAttribute="height" constant="40" id="yct-84-Mk4"/>
                     </constraints>
                     <state key="normal" title="发送请求">
                         <color key="titleShadowColor" white="0.5" alpha="1" colorSpace="calibratedWhite"/>
                     </state>
                     <connections>
                         <action selector="sendRequest:" destination="-1" eventType="touchUpInside" id="8zG-Dl-erk"/>
                     </connections>
                 </button>
             </subviews>
             <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
             <constraints>
                 <constraint firstAttribute="bottom" secondItem="zCQ-LM-grx" secondAttribute="bottom" constant="40" id="DBx-zw-hdG"/>
                 <constraint firstAttribute="centerX" secondItem="zCQ-LM-grx" secondAttribute="centerX" id="F2b-L7-BR9"/>
             </constraints>
         </view>
     </objects>
 </document>

JSONRequestViewController.h

 #import <UIKit/UIKit.h>

 @interface JSONRequestViewController : UIViewController <UITableViewDataSource, UITableViewDelegate, UIWebViewDelegate>
 @property (strong, nonatomic) NSMutableArray *mArrCell;
 @property (strong, nonatomic) UITableView *tableView;
 @property (strong, nonatomic) UILabel *lblEmptyDataMsg;
 @property (strong, nonatomic) UIWebView *webView;

 @property (strong, nonatomic) IBOutlet UIButton *btnSendRequest;

 @end 

JSONRequestViewController.m

 #import "JSONRequestViewController.h"
 #import "AFNetworking.h"
 #import "AFNetworkActivityIndicatorManager.h"
 #import "UIButton+BeautifulButton.h"
 #import "KMTableViewCell.h"
 #import "NSString+OpenURL.h"

 static NSString *cellIdentifier = @"cellIdentifier";
 @interface JSONRequestViewController ()
 - (void)layoutUI;
 - (NSString *)displayTimeFromCreatedAt:(NSString *)createdAt;
 - (void)loadData:(NSArray *)arrData;
 @end

 @implementation JSONRequestViewController

 - (void)viewDidLoad {
     [super viewDidLoad];

     [self layoutUI];
 }

 - (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
 }

 - (void)layoutUI {
     self.navigationItem.title = kTitleOfJSONRequest;

     [_btnSendRequest beautifulButton:nil];

     _mArrCell = [[NSMutableArray alloc] initWithCapacity:];

     CGRect rect = [[UIScreen mainScreen] bounds];
     CGRect frame = CGRectMake(5.0, 64.0, rect.size.width - 10.0, rect.size.height - 164.0);
     _tableView =[[UITableView alloc] initWithFrame:frame style:UITableViewStylePlain];
     _tableView.dataSource = self;
     _tableView.delegate = self;
     //设置边距，解决单元格分割线默认偏移像素过多的问题
     if ([_tableView respondsToSelector:@selector(setSeparatorInset:)]) {
         [_tableView setSeparatorInset:UIEdgeInsetsZero]; //设置单元格（上左下右）内边距
     }
     if ([_tableView respondsToSelector:@selector(setLayoutMargins:)]) {
         [_tableView setLayoutMargins:UIEdgeInsetsZero]; //设置单元格（上左下右）外边距
     }
     [self.view addSubview:_tableView];

     //注册可复用的单元格
     UINib *nib = [UINib nibWithNibName:@"KMTableViewCell" bundle:nil];
     [_tableView registerNib:nib forCellReuseIdentifier:cellIdentifier];

     //空数据时，显示的提示内容
     _lblEmptyDataMsg = [[UILabel alloc] initWithFrame:CGRectMake(0.0, 0.0, 300.0, 50.0)];
     CGPoint newPoint = _tableView.center;
     newPoint.y -= 45.0;
     _lblEmptyDataMsg.center = newPoint;
     _lblEmptyDataMsg.text = @"点击「发送请求」按钮获取全球新闻信息";
     _lblEmptyDataMsg.textColor = [UIColor grayColor];
     _lblEmptyDataMsg.textAlignment = NSTextAlignmentCenter;
     _lblEmptyDataMsg.font = [UIFont systemFontOfSize:16.0];
     [_tableView addSubview:_lblEmptyDataMsg];

     //点击单元格时，显示的新闻信息详细内容
     frame = CGRectMake(10.0, CGRectGetMidY(rect) - 200.0, rect.size.width - 20.0, 400.0);
     _webView = [[UIWebView alloc] initWithFrame:frame];
     _webView.layer.borderColor = [UIColor lightGrayColor].CGColor;
     _webView.layer.borderWidth = 1.0;
     _webView.delegate = self;
     _webView.hidden = YES;
     [self.view addSubview:_webView];

     [AFNetworkActivityIndicatorManager sharedManager].enabled = YES;
 }

 - (NSString *)displayTimeFromCreatedAt:(NSString *)createdAt {
     NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
     [dateFormat setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss'Z'"]; //「2015-09-15T13:23:28Z」
     NSDate *date = [dateFormat dateFromString:createdAt];

     NSTimeZone *zone = [NSTimeZone systemTimeZone];
     NSInteger interval = [zone secondsFromGMTForDate:date]; //跟 GMT 时间相差8小时
     date = [date dateByAddingTimeInterval:interval];
     [dateFormat setDateFormat:@"yyyy-MM-dd HH:mm:ss"]; //转化为「2015-09-15 21:23:28」
     NSString *displayTime = [dateFormat stringFromDate:date];
     return displayTime;
 }

 - (void)loadData:(NSArray *)arrData {
     _mArrCell = [NSMutableArray new];
     [arrData enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
         NSMutableDictionary *mDicCell = [NSMutableDictionary new];
         NSDictionary *dicRoot = (NSDictionary *)obj;
         NSArray *arrLink = [dicRoot valueForKeyPath:@"entities.links"];
         [mDicCell setValue:[NSString stringWithFormat:@"%@?w=80&h=80",
                            [dicRoot valueForKeyPath:@"user.avatar_image.url"]]
                    forKey:kAvatarImageStr];
         [mDicCell setValue:[dicRoot valueForKeyPath:@"user.name"] forKey:kName];
         [mDicCell setValue:[dicRoot valueForKey:@"text"] forKey:kText];
         [mDicCell setValue:(arrLink.count >  ? [arrLink[] valueForKey:@"url"] : @"")
                     forKey:kLink];
         [mDicCell setValue:[self displayTimeFromCreatedAt:[dicRoot valueForKey:@"created_at"]]
                     forKey:kCreatedAt];
         [_mArrCell addObject:mDicCell];
     }];
     [self.tableView reloadData];
 }

 - (IBAction)sendRequest:(id)sender {
     _lblEmptyDataMsg.text = @"加载中...";
     _webView.hidden = YES;

     //方法一：AFHTTPRequestOperation
 //    NSURL *requestURL = [NSURL URLWithString:kJSONRequestURLStr];
 //    NSURLRequest *request = [NSURLRequest requestWithURL:requestURL];
 //    AFHTTPRequestOperation *op = [[AFHTTPRequestOperation alloc] initWithRequest:request];
 //    op.responseSerializer = [AFJSONResponseSerializer serializer];
 //    [op setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
 //        NSDictionary *dic = (NSDictionary *)responseObject;
 //        [self loadData:(NSArray *)dic[@"data"]];
 //    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
 //        NSLog(@"Error: %@", error);
 //    }];
 //    //start 是 AFNetworking 的自定义方法，他在自定义的线程中去执行操作；不是 NSOperation 对象实例的 start 方法，所以可以不用使用把操作添加到操作主队列的方法：[[NSOperationQueue mainQueue] addOperation:op]
 //    [op start];

     //方法二：AFHTTPRequestOperationManager
     AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
     [manager GET:kJSONRequestURLStr parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
         NSDictionary *dic = (NSDictionary *)responseObject;
         [self loadData:(NSArray *)dic[@"data"]];
     } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
         NSLog(@"Error: %@", error);
     }];
 }

 - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
     _webView.hidden = YES;
 }

 #pragma mark - TableView
 - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
     return @"全球新闻信息列表";
 }

 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
     return ;
 }

 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
     NSUInteger count = _mArrCell.count;
     _lblEmptyDataMsg.hidden = count > ;

     return count;
 }

 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
     KMTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
     if (!cell) {
         cell = [[KMTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
                                       reuseIdentifier:cellIdentifier];
     }

     NSMutableDictionary *mDicCell = _mArrCell[indexPath.row];
     cell.avatarImageStr = mDicCell[kAvatarImageStr];
     cell.name = mDicCell[kName];
     cell.text = mDicCell[kText];
     cell.createdAt = mDicCell[kCreatedAt];
     cell.haveLink = [mDicCell[kLink] length] > ; //可以通过 isHaveLink 或 haveLink 获取值
     return cell;
 }

 - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
     return 90.0;
 }

 - (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
     /*
      viewDidLoad 中对应的操作
     if ([_tableView respondsToSelector:@selector(setSeparatorInset:)]) {
         [_tableView setSeparatorInset:UIEdgeInsetsZero]; //设置单元格（上左下右）内边距
     }
     if ([_tableView respondsToSelector:@selector(setLayoutMargins:)]) {
         [_tableView setLayoutMargins:UIEdgeInsetsZero]; //设置单元格（上左下右）外边距
     }
      */

     if ([cell respondsToSelector:@selector(setSeparatorInset:)]) {
         [cell setSeparatorInset:UIEdgeInsetsZero];
     }
     if ([cell respondsToSelector:@selector(setLayoutMargins:)]) {
         [cell setLayoutMargins:UIEdgeInsetsZero];
     }
 }

 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
     NSMutableDictionary *mDicCell = _mArrCell[indexPath.row];
     NSString *link = mDicCell[kLink];
     if (link.length > ) {
         //使用浏览器打开网址
         //[link openByBrowser];

         //使用 WebView 打开网址；由于这里很多网址是外国的，存在有的访问不了、有的访问慢导致加载超时的情况
         NSURLRequest *request = [[NSURLRequest alloc] initWithURL:[NSURL URLWithString:link]];
         [_webView loadRequest:request];
         _webView.hidden = NO;
     }
 }

 #pragma mark - WebView
 - (void)webViewDidStartLoad:(UIWebView *)webView {
     kApplication.networkActivityIndicatorVisible = YES;
 }

 - (void)webViewDidFinishLoad:(UIWebView *)webView {
     kApplication.networkActivityIndicatorVisible = NO;
 }

 - (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {
     NSLog(@"Error: %@", error);
     webView.hidden = YES;
     kApplication.networkActivityIndicatorVisible = NO;
     UIAlertView *alertVCustom = [[UIAlertView alloc] initWithTitle:@"提示信息"
                                                            message:@"网络连接错误"
                                                           delegate:nil
                                                  cancelButtonTitle:@"确定"
                                                  otherButtonTitles:nil, nil];
     [alertVCustom show];
 }

 @end

JSONRequestViewController.xib

 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="7706" systemVersion="14E46" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES">
     <dependencies>
         <deployment identifier="iOS"/>
         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="7703"/>
     </dependencies>
     <objects>
         <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner" customClass="JSONRequestViewController">
             <connections>
                 <outlet property="btnSendRequest" destination="zCQ-LM-grx" id="tgt-2z-WaB"/>
                 <outlet property="view" destination="i5M-Pr-FkT" id="sfx-zR-JGt"/>
             </connections>
         </placeholder>
         <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
         <view clearsContextBeforeDrawing="NO" contentMode="scaleToFill" id="i5M-Pr-FkT">
             <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
             <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
             <subviews>
                 <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="zCQ-LM-grx">
                     <rect key="frame" x="250" y="520" width="100" height="40"/>
                     <constraints>
                         <constraint firstAttribute="width" constant="100" id="V3R-30-5vV"/>
                         <constraint firstAttribute="height" constant="40" id="yct-84-Mk4"/>
                     </constraints>
                     <state key="normal" title="发送请求">
                         <color key="titleShadowColor" white="0.5" alpha="1" colorSpace="calibratedWhite"/>
                     </state>
                     <connections>
                         <action selector="sendRequest:" destination="-1" eventType="touchUpInside" id="8zG-Dl-erk"/>
                     </connections>
                 </button>
             </subviews>
             <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
             <constraints>
                 <constraint firstAttribute="bottom" secondItem="zCQ-LM-grx" secondAttribute="bottom" constant="40" id="DBx-zw-hdG"/>
                 <constraint firstAttribute="centerX" secondItem="zCQ-LM-grx" secondAttribute="centerX" id="F2b-L7-BR9"/>
             </constraints>
         </view>
     </objects>
 </document>

AppDelegate.h

 #import <UIKit/UIKit.h>

 @interface AppDelegate : UIResponder <UIApplicationDelegate>

 @property (strong, nonatomic) UIWindow *window;
 @property (strong, nonatomic) UINavigationController *navigationController;

 @end 

AppDelegate.m

 #import "AppDelegate.h"
 #import "ViewController.h"

 @interface AppDelegate ()

 @end

 @implementation AppDelegate

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
     _window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
     ViewController *viewController = [[ViewController alloc]
                                       initWithSampleNameArray:@[ kTitleOfXMLRequest,
                                                                  kTitleOfJSONRequest ]];
     _navigationController = [[UINavigationController alloc] initWithRootViewController:viewController];
     _window.rootViewController = _navigationController;
     //[_window addSubview:_navigationController.view]; //当_window.rootViewController关联时，这一句可有可无
     [_window makeKeyAndVisible];
     return YES;
 }

 - (void)applicationWillResignActive:(UIApplication *)application {
 }

 - (void)applicationDidEnterBackground:(UIApplication *)application {
 }

 - (void)applicationWillEnterForeground:(UIApplication *)application {
 }

 - (void)applicationDidBecomeActive:(UIApplication *)application {
 }

 - (void)applicationWillTerminate:(UIApplication *)application {
 }

 @end