ios网络NSURLConnection

  1 #import "HMViewController.h"
  2 #import "MBProgressHUD+MJ.h"
  3 
  4 @interface HMViewController () <NSURLConnectionDataDelegate>
  5 @property (weak, nonatomic) IBOutlet UITextField *usernameField;
  6 @property (weak, nonatomic) IBOutlet UITextField *pwdField;
  7 - (IBAction)login;
  8 
  9 /**
 10  *  用来存放服务器返回的所有数据
 11  */
 12 @property (nonatomic, strong) NSMutableData *responseData;
 13 @end
 14 
 15 @implementation HMViewController
 16 
 17 - (void)viewDidLoad
 18 {
 19     [super viewDidLoad];
 20     
 21 }
 22 
 23 /**
 24  *  登录逻辑
 25  */
 26 - (IBAction)login
 27 {
 28     // 1.表单验证(输入验证)
 29     NSString *username = self.usernameField.text;
 30     if (username.length == 0) { // 没有输入用户名
 31         [MBProgressHUD showError:@"请输入用户名"];
 32         return;
 33     }
 34     
 35     NSString *pwd = self.pwdField.text;
 36     if (pwd.length == 0) { // 没有输入密码
 37         [MBProgressHUD showError:@"请输入密码"];
 38         return;
 39     }
 40     
 41     // 弹框
 42     [MBProgressHUD showMessage:@"正在拼命登录中..."];
 43     
 44     // 2.发送请求给服务器(带上帐号和密码)
 45     // GET请求:请求行\请求头
 46     
 47     // 2.1.设置请求路径
 48     NSString *urlStr = [NSString stringWithFormat:@"http://192.168.1.200:8080/MJServer/login?username=%@&pwd=%@", username, pwd];
 49     
 50     // 转码
 51     urlStr = [urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
 52     
 53     // URL里面不能包含中文
 54     NSURL *url = [NSURL URLWithString:urlStr];
 55     
 56     // 2.2.创建请求对象
 57     NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url]; // 默认就是GET请求
 58     request.timeoutInterval = 5; // 设置请求超时
 59     
 60     // 2.3.发送请求
 61     [self sendAsync:request];
 62     
 63     NSLog(@"---------已经发出请求");
 64 }
 65 
 66 #pragma mark - NSURLConnectionDataDelegate 代理方法
 67 /**
 68  *  请求错误(失败)的时候调用(请求超时\断网\没有网, 一般指客户端错误)
 69  */
 70 - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
 71 {
 72     NSLog(@"connection:didFailWithError:");
 73     [MBProgressHUD hideHUD];
 74     
 75     [MBProgressHUD showError:@"网络繁忙, 请稍后再试"];
 76 }
 77 
 78 /**
 79  *  当接受到服务器的响应(连通了服务器)就会调用
 80  */
 81 - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
 82 {
 83     NSLog(@"connection:didReceiveResponse:");
 84     
 85     // 初始化数据
 86     self.responseData = [NSMutableData data];
 87 }
 88 
 89 /**
 90  *  当接受到服务器的数据就会调用(可能会被调用多次, 每次调用只会传递部分数据)
 91  */
 92 - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
 93 {
 94     NSLog(@"connection:didReceiveData:");
 95     
 96     // 拼接(收集)数据
 97     [self.responseData appendData:data];
 98 }
 99 
100 /**
101  *  当服务器的数据接受完毕后就会调用
102  */
103 - (void)connectionDidFinishLoading:(NSURLConnection *)connection
104 {
105     NSLog(@"connectionDidFinishLoading:");
106     
107     // 隐藏HUD
108     [MBProgressHUD hideHUD];
109     
110     // 解析服务器返回的数据
111     NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:self.responseData options:NSJSONReadingMutableLeaves error:nil];
112     NSString *error =  dict[@"error"];
113     if (error) { // 登录失败
114         [MBProgressHUD showError:error];
115     } else { // 登录成功
116         NSString *success =  dict[@"success"];
117         [MBProgressHUD showSuccess:success];
118     }
119 }
120 
121 /**
122  *  发送异步请求的方式2: start方法, 代理
123  */
124 - (void)sendAsync2:(NSURLRequest *)request
125 {
126     NSURLConnection *conn = [NSURLConnection connectionWithRequest:request delegate:self];
127     [conn start]; // 异步执行
128 }
129 
130 /**
131  *  发送异步请求的方式1: 类方法, block
132  */
133 - (void)sendAsync:(NSURLRequest *)request
134 {
135     NSOperationQueue *queue = [NSOperationQueue mainQueue];
136     [NSURLConnection sendAsynchronousRequest:request queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {  // 当请求结束的时候调用 (拿到了服务器的数据, 请求失败)
137         
138         // 隐藏HUD (刷新UI界面, 一定要放在主线程, 不能放在子线程)
139         [MBProgressHUD hideHUD];
140         
141         /**
142          解析data :
143          {"error":"用户名不存在"}
144          {"error":"密码不正确"}
145          {"success":"登录成功"}
146          */
147         if (data) { // 请求成功
148             NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil];
149             NSString *error = dict[@"error"];
150             if (error) { // 登录失败
151                 [MBProgressHUD showError:error];
152             } else { // 登录成功
153                 NSString *success =  dict[@"success"];
154                 [MBProgressHUD showSuccess:success];
155             }
156         } else { // 请求失败
157             [MBProgressHUD showError:@"网络繁忙, 请稍后再试"];
158         }
159     }];
160 }
161 
162 @end