AFNetworking使用总结

1 将afnetworking文件夹导入项目

2 添加类库 security.framework、mobilecoreservices.framework、systemconfiguration.framework

3 在使用的地方 #import "afnetworking.h"

解决编译时警告：

prefix.pch文件中加入  

#import <systemconfiguration/systemconfiguration.h>  

#import <mobilecoreservices/mobilecoreservices.h>  

注：afnetworking使用了arc ，在不使用arc项目中使用时，对afnetworking的所有.m文件添加“-fobjc-arc” 

  在使用arc项目中，使用“不使用arc”的类库时，对类库的.m文件添加“-fno-objc-arc”

static nsstring*const baseurlstring = @"http://www.raywenderlich.com/downloads/weather_sample/";     

    // 1      nsstring *weatherurl = [nsstringstringwithformat:@"[e-mail]?format=json",baseurlstring];      nsurl *url = [nsurlurlwithstring:weatherurl];      nsurlrequest *request = [nsurlrequestrequestwithurl:url];       // 2      afjsonrequestoperation *operation =      [afjsonrequestoperationjsonrequestoperationwithrequest:request                                                success:^(nsurlrequest*request, nshttpurlresponse *response, id json) {                                                   //                                                   nsdictionary*dicweather = (nsdictionary *)json;                                                   nslog(@"result:%@",dicweather);                                                }                                                failure:^(nsurlrequest*request, nshttpurlresponse *response, nserror *error, id json) {                                                   uialertview*alertview = [[uialertview alloc] initwithtitle:@"error retrievingweather"                                                                                                 message:[nsstringstringwithformat:@"%@",error]                                                                                                delegate:self                                                                                        cancelbuttontitle:@"ok"                                                                                        otherbuttontitles: nil];                                                   [alertview show];                                                }];      // 5      [operation start];   

(1)根据基本的url构造除完整的一个url，然后通过这个完整的url获得一个nsurl对象，然后根据这个url获得一个nsurlrequest。 

(2)afjsonrequestoperation是一个完整的类，整合了从网络中获取数据并对json进行解析。 

(3)当请求成功，则运行成功块。在本例中，把解析出来的天气数据从json变量转换为一个字典(dictionary)，并将其存储在字典中。 

(4)如果运行出问题了，则运行失败块(failure block)，比如网络不可用。如果failure block被调用了，将会通过提示框显示错误信息。

6.afnetworking异步加载图片

[plain] view plaincopy  

[list=1](1)#import “uiimageview+afnetworking.h”  (2)uiimageview *imageview = [[uiimageview alloc]initwithframe:cgrectmake(40, 80, 40, 40)];      __weak uiimageview *_imageview = imageview;      [imageviewsetimagewithurlrequest:[[nsurlrequest alloc] initwithurl:[nsurlurlwithstring:@"http://www.worldweatheronline.com/images/wsymbols01_png_64/wsymbol_0001_sunny.png"]]                     placeholderimage:[uiimage imagenamed:@"placeholder.png"]                             success:^(nsurlrequest *request,nshttpurlresponse *response, uiimage *image) {                                _imageview.image = image;     

                              [_imageview setneedsdisplay];                             }                             failure:^(nsurlrequest *request, nshttpurlresponse*response, nserror *error) {                                ;                             }];      [self.view addsubview:imageview];    

7.get 和post请求 

(1).构建一个baseurl，以及一个参数字典，并将这两个变量传给afhttpclient. 

(2).将afjsonrequestoperation注册为http的操作, 这样就可以跟之前的示例一样，可以获得解析好的json数据。 

(3).做了一个get请求，这个请求有一对block：success和failure。 

(4).post请求跟get一样

[list=1]afhttpclient *client= [[afhttpclient alloc] initwithbaseurl:baseurl];  [clientregisterhttpoperationclass:[afjsonrequestoperation class]];  [clientsetdefaultheader:@"accept" value:@"application/json"];  [client postpath:@"weather.php"                parameters:parameters                  success:^(afhttprequestoperation *operation, id responseobject) {                       self.weather =responseobject;                       self.title = @"httppost";                       [self.tableviewreloaddata];                   }                  failure:^(afhttprequestoperation *operation, nserror*error) {                       uialertview *av =[[uialertview alloc] initwithtitle:@"error retrieving weather"                                                                   message:[nsstringstringwithformat:@"%@",error]                                                                  delegate:nil                                                         cancelbuttontitle:@"ok" otherbuttontitles:nil];                       [av show];                    }           ];     

[client getpath:@"weather.php"               parameters:parameters                 success:^(afhttprequestoperation *operation, id responseobject) {                      self.weather =responseobject;                      self.title = @"http get";                      [self.tableviewreloaddata];                  }                 failure:^(afhttprequestoperation *operation, nserror*error) {                      uialertview *av =[[uialertview alloc] initwithtitle:@"error retrieving weather"                                                                   message:[nsstringstringwithformat:@"%@",error]                                                                 delegate:nil                                                        cancelbuttontitle:@"ok" otherbuttontitles:nil];                      [av show];     

                }           ];    

另外，请求方式可以创建一个类继承afhttpclient ，官方的例子就是这样写的。 

状态栏设置 

在appdelegate里面的 - (bool)application:(uiapplication *)application  

didfinishlaunchingwithoptions:(nsdictionary *)launchoptions 方法中添加 [[afnetworkactivityindicatormanager sharedmanager] setenabled:yes];用来给用户做出网络访问的提示。 

请求超时设置 

timeout和参数都是在nsurlrequest/nsmutableurlrequest设置的 

[list=1] 

nsmutableurlrequest *request = [client requestwithmethod:@"get" path:@"/" parameters:nil];//这里的parameters:参数就是你的第二个问题如何设置参数 

[request settimeoutinterval:120]; 

afhttprequestoperation *operation = [client httprequestoperationwithrequest:request success:^{...} failure:^{...}]; 

[client enqueuehttprequestoperation:operation]; 

如果你是继承了afhttpclient  

就需要override一个方法requestwithmethod 

- (nsmutableurlrequest *)requestwithmethod:(nsstring *)method path:(nsstring *)path parameters:(nsdictionary *)parameters{    

nsmutableurlrequest *request = [super requestwithmethod:method path:path parameters:parameters];    

[request settimeoutinterval:15];    

return request; } 

这个时候的参数设置是调用 

[self postpath:@"" parameters:nil //参数 

           success:^(afhttprequestoperation *operation, id responseobject) { 

               if (success) { 

                   success((afjsonrequestoperation *)operation, responseobject); 

               } 

           } failure:^(afhttprequestoperation *operation, nserror *error) { 

               if (failure) { 

                   failure((afjsonrequestoperation *)operation, error); 

           }]; 

本文链接：http://www.cocoachina.com/bbs/read.php?tid=184183