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：

1. Prefix.pch文件中加入  
2. #import <SystemConfiguration/SystemConfiguration.h>  
3. #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”

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1. static NSString*const BaseURLString = @"http://www.raywenderlich.com/downloads/weather_sample/";     
2.     // 1      NSString *weatherUrl = [NSStringstringWithFormat:@"%@weather.php?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

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2.   
3. [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;     
4.                               [_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

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1. [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];                    }           ];     
2. [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];     
3.                 }           ];    

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 

1. [list=1] 
2. 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 
3. [request setTimeoutInterval:120]; 
4. AFHTTPRequestOperation *operation = [client HTTPRequestOperationWithRequest:request success:^{...} failure:^{...}]; 
5. [client enqueueHTTPRequestOperation:operation]; 

如果你是继承了AFHTTPClient  

就需要override一个方法requestWithMethod 

1. - (NSMutableURLRequest *)requestWithMethod:(NSString *)method path:(NSString *)path parameters:(NSDictionary *)parameters{    
2. NSMutableURLRequest *request = [super requestWithMethod:method path:path parameters:parameters];    
3. [request setTimeoutInterval:15];    
4. return request; } 

这个时候的参数设置是调用 

1. [self postPath:@"" parameters:nil //参数 
2.            success:^(AFHTTPRequestOperation *operation, id responseObject) { 
3.                if (success) { 
4.                    success((AFJSONRequestOperation *)operation, responseObject); 
5.                } 
6.            } failure:^(AFHTTPRequestOperation *operation, NSError *error) { 
7.                if (failure) { 
8.                    failure((AFJSONRequestOperation *)operation, error); 
9.                } 
10.            }]; 

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