XML 数据请求与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

 

 

JSON 数据格式：

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

 

ViewController.h

1 #import <UIKit/UIKit.h>
2 
3 @interface ViewController : UITableViewController
4 @property (copy, nonatomic) NSArray *arrSampleName;
5 
6 - (instancetype)initWithSampleNameArray:(NSArray *)arrSampleName;
7 
8 @end 

ViewController.m

 1 #import "ViewController.h"
 2 #import "XMLRequestViewController.h"
 3 #import "JSONRequestViewController.h"
 4 
 5 @interface ViewController ()
 6 - (void)layoutUI;
 7 @end
 8 
 9 @implementation ViewController
10 - (void)viewDidLoad {
11     [super viewDidLoad];
12     
13     [self layoutUI];
14 }
15 
16 - (void)didReceiveMemoryWarning {
17     [super didReceiveMemoryWarning];
18     // Dispose of any resources that can be recreated.
19 }
20 
21 - (instancetype)initWithSampleNameArray:(NSArray *)arrSampleName {
22     if (self = [super initWithStyle:UITableViewStyleGrouped]) {
23         self.navigationItem.title = @"使用 AFNetworking 进行数据请求";
24         self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"返回" style:UIBarButtonItemStylePlain target:nil action:nil];
25         
26         _arrSampleName = arrSampleName;
27     }
28     return self;
29 }
30 
31 - (void)layoutUI {
32     
33 }
34 
35 #pragma mark - UITableViewController相关方法重写
36 - (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {
37     return 0.1;
38 }
39 
40 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
41     return 1;
42 }
43 
44 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
45     return [_arrSampleName count];
46 }
47 
48 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
49     static NSString *cellIdentifier = @"cell";
50     UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
51     if (!cell) {
52         cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
53     }
54     cell.textLabel.text = _arrSampleName[indexPath.row];
55     return cell;
56 }
57 
58 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
59     switch (indexPath.row) {
60         case 0: {
61             XMLRequestViewController *XMLRequestVC = [XMLRequestViewController new];
62             [self.navigationController pushViewController:XMLRequestVC animated:YES];
63             break;
64         }
65         case 1: {
66             JSONRequestViewController *JSONRequestVC = [JSONRequestViewController new];
67             [self.navigationController pushViewController:JSONRequestVC animated:YES];
68             break;
69             
70             /*
71              类似堆栈的先进后出的原理：
72              返回到（上一级）、（任意级）、（根级）导航
73              [self.navigationController popViewControllerAnimated:YES];
74              [self.navigationController popToViewController:thirdSampleVC animated:YES];
75              [self.navigationController popToRootViewControllerAnimated:YES];
76              */
77         }
78         default:
79             break;
80     }
81 }
82 
83 @end 

PrefixHeader.pch

1 #define kXMLRequestURLStr @"http://www.webxml.com.cn/WebServices/WeatherWebService.asmx/getWeatherbyCityName?theCityName=59287"
 2 #define kJSONRequestURLStr @"https://alpha-api.app.net/stream/0/posts/stream/global"
 3 
 4 #define kTitleOfXMLRequest @"XML 数据请求"
 5 #define kTitleOfJSONRequest @"JSON 数据请求"
 6 
 7 #define kAvatarImageStr @"avatarImageStr"
 8 #define kName @"name"
 9 #define kText @"text"
10 #define kLink @"link"
11 #define kCreatedAt @"createdAt"
12 
13 #define kApplication [UIApplication sharedApplication] 

UIButton+BeautifulButton.h

 1 #import <UIKit/UIKit.h>
 2 
 3 @interface UIButton (BeautifulButton)
 4 /**
 5  *  根据按钮文字颜色，返回对应文字颜色的圆角按钮
 6  *
 7  *  @param tintColor 按钮文字颜色；nil 的话就为深灰色
 8  */
 9 - (void)beautifulButton:(UIColor *)tintColor;
10 
11 @end 

UIButton+BeautifulButton.m

 1 #import "UIButton+BeautifulButton.h"
 2 
 3 @implementation UIButton (BeautifulButton)
 4 
 5 - (void)beautifulButton:(UIColor *)tintColor {
 6     self.tintColor = tintColor ?: [UIColor darkGrayColor];
 7     self.layer.masksToBounds = YES;
 8     self.layer.cornerRadius = 10.0;
 9     self.layer.borderColor = [UIColor grayColor].CGColor;
10     self.layer.borderWidth = 1.0;
11 }
12 
13 @end 

NSString+OpenURL.h

 1 #import <UIKit/UIKit.h>
 2 
 3 @interface NSString (OpenURL)
 4 /**
 5  *  打开浏览器
 6  */
 7 - (void)openByBrowser;
 8 
 9 /**
10  *  打开邮件
11  */
12 - (void)openByEmail;
13 
14 /**
15  *  拨打电话
16  */
17 - (void)openByTelephone;
18 
19 /**
20  *  打开短信（Short Messaging Service）
21  */
22 - (void)openBySMS;
23 
24 @end 

NSString+OpenURL.m

 1 #import "NSString+OpenURL.h"
 2 
 3 @implementation NSString (OpenURL)
 4 
 5 + (void)open:(NSString *)openURLStr {
 6     [[UIApplication sharedApplication] openURL:[NSURL URLWithString:openURLStr]];
 7 }
 8 
 9 - (void)openByBrowser {
10     [NSString open:self];
11 }
12 
13 - (void)openByEmail {
14     [NSString open:[NSString stringWithFormat:@"mailto://%@", self]];
15 }
16 
17 - (void)openByTelephone {
18     [NSString open:[NSString stringWithFormat:@"tel://%@", self]];
19 }
20 
21 - (void)openBySMS {
22     [NSString open:[NSString stringWithFormat:@"sms://%@", self]];
23 }
24 
25 @end 

KMTableViewCell.h

 1 #import <UIKit/UIKit.h>
 2 
 3 @interface KMTableViewCell : UITableViewCell
 4 @property (strong, nonatomic) IBOutlet UIImageView *imgVAvatarImage;
 5 @property (strong, nonatomic) IBOutlet UILabel *lblName;
 6 @property (strong, nonatomic) IBOutlet UILabel *lblCreatedAt;
 7 @property (strong, nonatomic) IBOutlet UIImageView *imgVLink;
 8 
 9 @property (strong, nonatomic) UILabel *lblText;
10 @property (copy, nonatomic) NSString *avatarImageStr;
11 @property (copy, nonatomic) NSString *name;
12 @property (copy, nonatomic) NSString *text;
13 @property (copy, nonatomic) NSString *createdAt;
14 @property (assign, nonatomic, getter=isHaveLink) BOOL haveLink;
15 
16 @end 

KMTableViewCell.m

 1 #import "KMTableViewCell.h"
 2 //#import "UIImageView+AFNetworking.h"
 3 #import "UIImageView+WebCache.h"
 4 
 5 static UIImage *placeholderImage;
 6 static CGFloat widthOfLabel;
 7 @implementation KMTableViewCell
 8 
 9 - (void)awakeFromNib {
10     // Initialization code
11     static dispatch_once_t onceToken;
12     dispatch_once(&onceToken, ^{
13         placeholderImage = [UIImage imageNamed:@"JSON"];
14         widthOfLabel = [[UIScreen mainScreen] bounds].size.width - 100.0;
15     });
16     
17     _imgVAvatarImage.layer.masksToBounds = YES;
18     _imgVAvatarImage.layer.cornerRadius = 10.0;
19     
20     //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
21     _lblText = [[UILabel alloc] initWithFrame:CGRectMake(90.0, 23.0, widthOfLabel, 42.0)];
22     _lblText.numberOfLines = 2;
23     _lblText.font = [UIFont systemFontOfSize:12.0];
24     [self addSubview:_lblText];
25 }
26 
27 - (void)setSelected:(BOOL)selected animated:(BOOL)animated {
28     [super setSelected:selected animated:animated];
29 
30     // Configure the view for the selected state
31 }
32 
33 - (void)setAvatarImageStr:(NSString *)avatarImageStr {
34     if (![_avatarImageStr isEqualToString:avatarImageStr]) {
35         _avatarImageStr = [avatarImageStr copy];
36         NSURL *avatarImageURL = [NSURL URLWithString:_avatarImageStr];
37         //NSData *avatarImageData = [NSData dataWithContentsOfURL:avatarImageURL];
38         //_imgVAvatarImage.image = [UIImage imageWithData:avatarImageData];
39         
40         //图片缓存；性能优化的第一步
41         //方法一：AFNetworking 框架：UIImageView+AFNetworking
42 //        [_imgVAvatarImage setImageWithURL:avatarImageURL
43 //                         placeholderImage:placeholderImage];
44         
45         //方法二：SDWebImage 框架：UIImageView+WebCache
46         [_imgVAvatarImage sd_setImageWithURL:avatarImageURL
47                             placeholderImage:placeholderImage];
48     }
49 }
50 
51 - (void)setName:(NSString *)name {
52     _name = [name copy];
53     _lblName.text = _name;
54 }
55 
56 - (void)setText:(NSString *)text {
57     _text = [text copy];
58     _lblText.text = _text;
59 }
60 
61 - (void)setCreatedAt:(NSString *)createdAt {
62     _createdAt = [createdAt copy];
63     _lblCreatedAt.text = _createdAt;
64 }
65 
66 - (void)setHaveLink:(BOOL)haveLink {
67     _haveLink = haveLink;
68     _imgVLink.hidden = !_haveLink;
69 }
70 
71 @end 

KMTableViewCell.xib

 

 

XMLRequestViewController.h

1 #import <UIKit/UIKit.h>
2 
3 @interface XMLRequestViewController : UIViewController <NSXMLParserDelegate>
4 @property (strong, nonatomic) UITextView *txtVResult;
5 
6 @property (strong, nonatomic) IBOutlet UIButton *btnSendRequest;
7 
8 @end 

XMLRequestViewController.m

  1 #import "XMLRequestViewController.h"
  2 #import "AFNetworking.h"
  3 #import "AFNetworkActivityIndicatorManager.h"
  4 #import "UIButton+BeautifulButton.h"
  5 #import "XMLDictionary.h"
  6 
  7 @interface XMLRequestViewController ()
  8 - (void)layoutUI;
  9 - (void)convertXMLParserToDictionary:(NSXMLParser *)parser;
 10 @end
 11 
 12 @implementation XMLRequestViewController
 13 
 14 - (void)viewDidLoad {
 15     [super viewDidLoad];
 16     
 17     [self layoutUI];
 18 }
 19 
 20 - (void)didReceiveMemoryWarning {
 21     [super didReceiveMemoryWarning];
 22     // Dispose of any resources that can be recreated.
 23 }
 24 
 25 - (void)layoutUI {
 26     self.navigationItem.title = kTitleOfXMLRequest;
 27 
 28     [_btnSendRequest beautifulButton:nil];
 29     
 30     _txtVResult = [UITextView new];
 31     _txtVResult.editable = NO;
 32     CGRect rect = [[UIScreen mainScreen] bounds];
 33     _txtVResult.frame = CGRectMake(5.0, 64.0, rect.size.width - 10.0, rect.size.height - 164.0);
 34     _txtVResult.font = [UIFont systemFontOfSize:15.0];
 35     _txtVResult.text = @"点击「发送请求」按钮获取天气信息";
 36     [self.view addSubview:_txtVResult];
 37     
 38     //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
 39     [AFNetworkActivityIndicatorManager sharedManager].enabled = YES;
 40 }
 41 
 42 - (void)convertXMLParserToDictionary:(NSXMLParser *)parser {
 43     //dictionaryWithXMLParser: 是第三方框架 XMLDictionary 的方法
 44     NSDictionary *dic = [NSDictionary dictionaryWithXMLParser:parser];
 45     NSMutableString *mStrWeatherInfo = [[NSMutableString alloc] initWithString:@"广州近三天天气情况：
"];
 46     NSArray *arrWeatherInfo = [dic objectForKey:@"string"];
 47     if (arrWeatherInfo != nil && arrWeatherInfo.count > 22) {
 48         NSMutableArray *mArrRange = [[NSMutableArray alloc] init];
 49         
 50         NSUInteger loc = mStrWeatherInfo.length;
 51         [mStrWeatherInfo appendFormat:@"
 %@", arrWeatherInfo[6]];
 52         NSUInteger len = mStrWeatherInfo.length - loc;
 53         NSValue *valObj = [NSValue valueWithRange:NSMakeRange(loc, len)];
 54         [mArrRange addObject:valObj];
 55         [mStrWeatherInfo appendFormat:@"
 %@", arrWeatherInfo[5]];
 56         [mStrWeatherInfo appendFormat:@"
 %@", arrWeatherInfo[7]];
 57         [mStrWeatherInfo appendFormat:@"
 %@", arrWeatherInfo[10]];
 58         
 59         loc = mStrWeatherInfo.length;
 60         [mStrWeatherInfo appendFormat:@"

 %@", arrWeatherInfo[13]];
 61         len = mStrWeatherInfo.length - loc;
 62         valObj = [NSValue valueWithRange:NSMakeRange(loc, len)];
 63         [mArrRange addObject:valObj];
 64         [mStrWeatherInfo appendFormat:@"
 %@", arrWeatherInfo[12]];
 65         [mStrWeatherInfo appendFormat:@"
 %@", arrWeatherInfo[14]];
 66         
 67         loc = mStrWeatherInfo.length;
 68         [mStrWeatherInfo appendFormat:@"

 %@", arrWeatherInfo[18]];
 69         len = mStrWeatherInfo.length - loc;
 70         valObj = [NSValue valueWithRange:NSMakeRange(loc, len)];
 71         [mArrRange addObject:valObj];
 72         [mStrWeatherInfo appendFormat:@"
 %@", arrWeatherInfo[17]];
 73         [mStrWeatherInfo appendFormat:@"
 %@", arrWeatherInfo[19]];
 74         
 75         [mStrWeatherInfo appendFormat:@"

 %@", arrWeatherInfo[22]];
 76         
 77         //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
 78         NSMutableAttributedString *mAttrStr = [[NSMutableAttributedString alloc] initWithString:mStrWeatherInfo];
 79         [mAttrStr addAttribute:NSFontAttributeName
 80                          value:[UIFont boldSystemFontOfSize:16.0]
 81                          range:NSMakeRange(0, 10)];
 82         
 83         //数据的日期部分以紫色显示
 84         for (NSValue *valObj in mArrRange) {
 85             NSRange currentRange;
 86             [valObj getValue:&currentRange];
 87             [mAttrStr addAttribute:NSForegroundColorAttributeName
 88                              value:[UIColor purpleColor]
 89                              range:currentRange];
 90         }
 91         
 92         //数据的前10个字符之后的内容全部以15.0像素显示
 93         [mAttrStr addAttribute:NSFontAttributeName
 94                          value:[UIFont systemFontOfSize:15.0]
 95                          range:NSMakeRange(10, mStrWeatherInfo.length - 10)];
 96         
 97         _txtVResult.attributedText = mAttrStr;
 98     } else {
 99         _txtVResult.text = @"请求数据无效";
100     }
101     
102 }
103 
104 - (IBAction)sendRequest:(id)sender {
105     NSURL *requestURL = [NSURL URLWithString:kXMLRequestURLStr];
106     NSURLRequest *request = [NSURLRequest requestWithURL:requestURL];
107     AFHTTPRequestOperation *op = [[AFHTTPRequestOperation alloc] initWithRequest:request];
108     op.responseSerializer = [AFXMLParserResponseSerializer serializer];
109     [op setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
110         NSLog(@"JSON: %@", responseObject);
111         NSXMLParser *parser = (NSXMLParser *)responseObject;
112         //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
113         [self convertXMLParserToDictionary:parser];
114         
115         //parser.delegate = self;
116         //parser.shouldProcessNamespaces = YES;
117         //[parser parse];
118     } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
119         NSLog(@"Error: %@", error);
120     }];
121     //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]
122     [op start];
123 }
124 
125 
126 #pragma mark -
127 #pragma mark NSXMLParserDelegate
128 /* 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 */
129 - (void)parserDidStartDocument:(NSXMLParser *)parser {
130     NSLog(@"开始解析 XML 文件");
131 }
132 
133 /* 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 */
134 - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
135     attributes:(NSDictionary *)attributeDict {
136     NSLog(@"发现节点：%@", elementName);
137 }
138 
139 /* 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 */
140 - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string {
141     NSLog(@"正在解析节点内容：%@", string);
142 }
143 
144 /* 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 */
145 - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {
146     NSLog(@"解析节点结束：%@", elementName);
147 }
148 
149 /* 解析 XML 出错的处理方法 */
150 - (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError {
151     NSLog(@"解析 XML 出错：%@", parseError);
152 }
153 
154 /* 解析 XML 文件结束 */
155 - (void)parserDidEndDocument:(NSXMLParser *)parser {
156     NSLog(@"解析 XML 文件结束");
157 }
158 
159 @end 

XMLRequestViewController.xib

 

JSONRequestViewController.h

 1 #import <UIKit/UIKit.h>
 2 
 3 @interface JSONRequestViewController : UIViewController <UITableViewDataSource, UITableViewDelegate, UIWebViewDelegate>
 4 @property (strong, nonatomic) NSMutableArray *mArrCell;
 5 @property (strong, nonatomic) UITableView *tableView;
 6 @property (strong, nonatomic) UILabel *lblEmptyDataMsg;
 7 @property (strong, nonatomic) UIWebView *webView;
 8 
 9 @property (strong, nonatomic) IBOutlet UIButton *btnSendRequest;
10 
11 @end 

JSONRequestViewController.m

  1 #import "JSONRequestViewController.h"
  2 #import "AFNetworking.h"
  3 #import "AFNetworkActivityIndicatorManager.h"
  4 #import "UIButton+BeautifulButton.h"
  5 #import "KMTableViewCell.h"
  6 #import "NSString+OpenURL.h"
  7 
  8 static NSString *cellIdentifier = @"cellIdentifier";
  9 @interface JSONRequestViewController ()
 10 - (void)layoutUI;
 11 - (NSString *)displayTimeFromCreatedAt:(NSString *)createdAt;
 12 - (void)loadData:(NSArray *)arrData;
 13 @end
 14 
 15 @implementation JSONRequestViewController
 16 
 17 - (void)viewDidLoad {
 18     [super viewDidLoad];
 19     
 20     [self layoutUI];
 21 }
 22 
 23 - (void)didReceiveMemoryWarning {
 24     [super didReceiveMemoryWarning];
 25     // Dispose of any resources that can be recreated.
 26 }
 27 
 28 - (void)layoutUI {
 29     self.navigationItem.title = kTitleOfJSONRequest;
 30     
 31     [_btnSendRequest beautifulButton:nil];
 32     
 33     _mArrCell = [[NSMutableArray alloc] initWithCapacity:0];
 34     
 35     CGRect rect = [[UIScreen mainScreen] bounds];
 36     CGRect frame = CGRectMake(5.0, 64.0, rect.size.width - 10.0, rect.size.height - 164.0);
 37     _tableView =[[UITableView alloc] initWithFrame:frame style:UITableViewStylePlain];
 38     _tableView.dataSource = self;
 39     _tableView.delegate = self;
 40     //设置边距，解决单元格分割线默认偏移像素过多的问题
 41     if ([_tableView respondsToSelector:@selector(setSeparatorInset:)]) {
 42         [_tableView setSeparatorInset:UIEdgeInsetsZero]; //设置单元格（上左下右）内边距
 43     }
 44     if ([_tableView respondsToSelector:@selector(setLayoutMargins:)]) {
 45         [_tableView setLayoutMargins:UIEdgeInsetsZero]; //设置单元格（上左下右）外边距
 46     }
 47     [self.view addSubview:_tableView];
 48     
 49     //注册可复用的单元格
 50     UINib *nib = [UINib nibWithNibName:@"KMTableViewCell" bundle:nil];
 51     [_tableView registerNib:nib forCellReuseIdentifier:cellIdentifier];
 52     
 53     //空数据时，显示的提示内容
 54     _lblEmptyDataMsg = [[UILabel alloc] initWithFrame:CGRectMake(0.0, 0.0, 300.0, 50.0)];
 55     CGPoint newPoint = _tableView.center;
 56     newPoint.y -= 45.0;
 57     _lblEmptyDataMsg.center = newPoint;
 58     _lblEmptyDataMsg.text = @"点击「发送请求」按钮获取全球新闻信息";
 59     _lblEmptyDataMsg.textColor = [UIColor grayColor];
 60     _lblEmptyDataMsg.textAlignment = NSTextAlignmentCenter;
 61     _lblEmptyDataMsg.font = [UIFont systemFontOfSize:16.0];
 62     [_tableView addSubview:_lblEmptyDataMsg];
 63     
 64     //点击单元格时，显示的新闻信息详细内容
 65     frame = CGRectMake(10.0, CGRectGetMidY(rect) - 200.0, rect.size.width - 20.0, 400.0);
 66     _webView = [[UIWebView alloc] initWithFrame:frame];
 67     _webView.layer.borderColor = [UIColor lightGrayColor].CGColor;
 68     _webView.layer.borderWidth = 1.0;
 69     _webView.delegate = self;
 70     _webView.hidden = YES;
 71     [self.view addSubview:_webView];
 72     
 73     [AFNetworkActivityIndicatorManager sharedManager].enabled = YES;
 74 }
 75 
 76 - (NSString *)displayTimeFromCreatedAt:(NSString *)createdAt {
 77     NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
 78     [dateFormat setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss'Z'"]; //「2015-09-15T13:23:28Z」
 79     NSDate *date = [dateFormat dateFromString:createdAt];
 80     
 81     NSTimeZone *zone = [NSTimeZone systemTimeZone];
 82     NSInteger interval = [zone secondsFromGMTForDate:date]; //跟 GMT 时间相差8小时
 83     date = [date dateByAddingTimeInterval:interval];
 84     [dateFormat setDateFormat:@"yyyy-MM-dd HH:mm:ss"]; //转化为「2015-09-15 21:23:28」
 85     NSString *displayTime = [dateFormat stringFromDate:date];
 86     return displayTime;
 87 }
 88 
 89 - (void)loadData:(NSArray *)arrData {
 90     _mArrCell = [NSMutableArray new];
 91     [arrData enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
 92         NSMutableDictionary *mDicCell = [NSMutableDictionary new];
 93         NSDictionary *dicRoot = (NSDictionary *)obj;
 94         NSArray *arrLink = [dicRoot valueForKeyPath:@"entities.links"];
 95         [mDicCell setValue:[NSString stringWithFormat:@"%@?w=80&h=80",
 96                            [dicRoot valueForKeyPath:@"user.avatar_image.url"]]
 97                    forKey:kAvatarImageStr];
 98         [mDicCell setValue:[dicRoot valueForKeyPath:@"user.name"] forKey:kName];
 99         [mDicCell setValue:[dicRoot valueForKey:@"text"] forKey:kText];
100         [mDicCell setValue:(arrLink.count > 0 ? [arrLink[0] valueForKey:@"url"] : @"")
101                     forKey:kLink];
102         [mDicCell setValue:[self displayTimeFromCreatedAt:[dicRoot valueForKey:@"created_at"]]
103                     forKey:kCreatedAt];
104         [_mArrCell addObject:mDicCell];
105     }];
106     [self.tableView reloadData];
107 }
108 
109 - (IBAction)sendRequest:(id)sender {
110     _lblEmptyDataMsg.text = @"加载中...";
111     _webView.hidden = YES;
112     
113     //方法一：AFHTTPRequestOperation
114 //    NSURL *requestURL = [NSURL URLWithString:kJSONRequestURLStr];
115 //    NSURLRequest *request = [NSURLRequest requestWithURL:requestURL];
116 //    AFHTTPRequestOperation *op = [[AFHTTPRequestOperation alloc] initWithRequest:request];
117 //    op.responseSerializer = [AFJSONResponseSerializer serializer];
118 //    [op setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
119 //        NSDictionary *dic = (NSDictionary *)responseObject;
120 //        [self loadData:(NSArray *)dic[@"data"]];
121 //    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
122 //        NSLog(@"Error: %@", error);
123 //    }];
124 //    //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]
125 //    [op start];
126     
127     //方法二：AFHTTPRequestOperationManager
128     AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
129     [manager GET:kJSONRequestURLStr parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
130         NSDictionary *dic = (NSDictionary *)responseObject;
131         [self loadData:(NSArray *)dic[@"data"]];
132     } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
133         NSLog(@"Error: %@", error);
134     }];
135 }
136 
137 - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
138     _webView.hidden = YES;
139 }
140 
141 #pragma mark - TableView
142 - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
143     return @"全球新闻信息列表";
144 }
145 
146 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
147     return 1;
148 }
149 
150 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
151     NSUInteger count = _mArrCell.count;
152     _lblEmptyDataMsg.hidden = count > 0;
153     
154     return count;
155 }
156 
157 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
158     KMTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
159     if (!cell) {
160         cell = [[KMTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
161                                       reuseIdentifier:cellIdentifier];
162     }
163     
164     NSMutableDictionary *mDicCell = _mArrCell[indexPath.row];
165     cell.avatarImageStr = mDicCell[kAvatarImageStr];
166     cell.name = mDicCell[kName];
167     cell.text = mDicCell[kText];
168     cell.createdAt = mDicCell[kCreatedAt];
169     cell.haveLink = [mDicCell[kLink] length] > 0; //可以通过 isHaveLink 或 haveLink 获取值
170     return cell;
171 }
172 
173 - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
174     return 90.0;
175 }
176 
177 - (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
178     /*
179      viewDidLoad 中对应的操作
180     if ([_tableView respondsToSelector:@selector(setSeparatorInset:)]) {
181         [_tableView setSeparatorInset:UIEdgeInsetsZero]; //设置单元格（上左下右）内边距
182     }
183     if ([_tableView respondsToSelector:@selector(setLayoutMargins:)]) {
184         [_tableView setLayoutMargins:UIEdgeInsetsZero]; //设置单元格（上左下右）外边距
185     }
186      */
187     
188     if ([cell respondsToSelector:@selector(setSeparatorInset:)]) {
189         [cell setSeparatorInset:UIEdgeInsetsZero];
190     }
191     if ([cell respondsToSelector:@selector(setLayoutMargins:)]) {
192         [cell setLayoutMargins:UIEdgeInsetsZero];
193     }
194 }
195 
196 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
197     NSMutableDictionary *mDicCell = _mArrCell[indexPath.row];
198     NSString *link = mDicCell[kLink];
199     if (link.length > 0) {
200         //使用浏览器打开网址
201         //[link openByBrowser];
202         
203         //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
204         NSURLRequest *request = [[NSURLRequest alloc] initWithURL:[NSURL URLWithString:link]];
205         [_webView loadRequest:request];
206         _webView.hidden = NO;
207     }
208 }
209 
210 #pragma mark - WebView
211 - (void)webViewDidStartLoad:(UIWebView *)webView {
212     kApplication.networkActivityIndicatorVisible = YES;
213 }
214 
215 - (void)webViewDidFinishLoad:(UIWebView *)webView {
216     kApplication.networkActivityIndicatorVisible = NO;
217 }
218 
219 - (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {
220     NSLog(@"Error: %@", error);
221     webView.hidden = YES;
222     kApplication.networkActivityIndicatorVisible = NO;
223     UIAlertView *alertVCustom = [[UIAlertView alloc] initWithTitle:@"提示信息"
224                                                            message:@"网络连接错误"
225                                                           delegate:nil
226                                                  cancelButtonTitle:@"确定"
227                                                  otherButtonTitles:nil, nil];
228     [alertVCustom show];
229 }
230 
231 @end

JSONRequestViewController.xib

 

AppDelegate.h

1 #import <UIKit/UIKit.h>
2 
3 @interface AppDelegate : UIResponder <UIApplicationDelegate>
4 
5 @property (strong, nonatomic) UIWindow *window;
6 @property (strong, nonatomic) UINavigationController *navigationController;
7 
8 @end 

AppDelegate.m

 1 #import "AppDelegate.h"
 2 #import "ViewController.h"
 3 
 4 @interface AppDelegate ()
 5 
 6 @end
 7 
 8 @implementation AppDelegate
 9 
10 
11 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
12     _window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
13     ViewController *viewController = [[ViewController alloc]
14                                       initWithSampleNameArray:@[ kTitleOfXMLRequest,
15                                                                  kTitleOfJSONRequest ]];
16     _navigationController = [[UINavigationController alloc] initWithRootViewController:viewController];
17     _window.rootViewController = _navigationController;
18     //[_window addSubview:_navigationController.view]; //当_window.rootViewController关联时，这一句可有可无
19     [_window makeKeyAndVisible];
20     return YES;
21 }
22 
23 - (void)applicationWillResignActive:(UIApplication *)application {
24 }
25 
26 - (void)applicationDidEnterBackground:(UIApplication *)application {
27 }
28 
29 - (void)applicationWillEnterForeground:(UIApplication *)application {
30 }
31 
32 - (void)applicationDidBecomeActive:(UIApplication *)application {
33 }
34 
35 - (void)applicationWillTerminate:(UIApplication *)application {
36 }
37 
38 @end