iOS开源项目：AFNetworking----写得非常好

https://github.com/AFNetworking/AFNetworking

与asi-http-request功能类似的网络库，不过是基于NSURLConnection 和 NSOperation 的,同样支持iOS与MacOS双平台。目前的更新比较频繁，适合新项目使用，而且使用起来也更简单。

操作JSON

- (IBAction)jsonTapped:(id)sender {

    // 1

    NSString *weatherUrl = [NSString stringWithFormat:@"%@weather.php?format=json", BaseURLString];

    NSURL *url = [NSURL URLWithString:weatherUrl];

    NSURLRequest *request = [NSURLRequest requestWithURL:url];

    // 2

    AFJSONRequestOperation *operation =

    [AFJSONRequestOperation JSONRequestOperationWithRequest:request

        // 3

        success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {

            self.weather  = (NSDictionary *)JSON;

            self.title = @"JSON Retrieved";

            [self.tableView reloadData];

        }

        // 4

        failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {

            UIAlertView *av = [[UIAlertView alloc] initWithTitle:@"Error Retrieving Weather"

                                                         message:[NSString stringWithFormat:@"%@",error]

                                                        delegate:nil

                                               cancelButtonTitle:@"OK" otherButtonTitles:nil];

            [av show];

        }];

    // 5

    [operation start];

}

根据基本的URL构造出完整的一个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.
AFJSONRequestOperation 是一个功能完整的类（all-in-one）— 整合了从网络中获取数据并对JSON进行解析。
当请求成功，则运行成功块（success block）。在本示例中，把解析出来的天气数据从JSON变量转换为一个字典（dictionary），并将其存储在属性 weather 中.
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出错误信息。

操作Property Lists(plists)

 -(IBAction)plistTapped:(id)sender{

    NSString *weatherUrl = [NSString stringWithFormat:@"%@weather.php?format=plist",BaseURLString];

    NSURL *url = [NSURL URLWithString:weatherUrl];

    NSURLRequest *request = [NSURLRequest requestWithURL:url];

    AFPropertyListRequestOperation *operation =

    [AFPropertyListRequestOperation propertyListRequestOperationWithRequest:request

        success:^(NSURLRequest *request, NSHTTPURLResponse *response, id propertyList) {

            self.weather  = (NSDictionary *)propertyList;

            self.title = @"PLIST Retrieved";

            [self.tableView reloadData];

        }

        failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id propertyList) {

            UIAlertView *av = [[UIAlertView alloc] initWithTitle:@"Error Retrieving Weather"

                              message:[NSString stringWithFormat:@"%@",error]

                                                        delegate:nil

                                               cancelButtonTitle:@"OK"

                                               otherButtonTitles:nil];

            [av show];

    }];

    [operation start];

}

上面的代码几乎与JSON版的一致，只不过将操作（operation）的类型从AFJSONOperation 修改为 AFPropertyListOperation.

操作XML

- (IBAction)xmlTapped:(id)sender{

    NSString *weatherUrl = [NSString stringWithFormat:@"%@weather.php?format=xml",BaseURLString];

    NSURL *url = [NSURL URLWithString:weatherUrl];

    NSURLRequest *request = [NSURLRequest requestWithURL:url];

    AFXMLRequestOperation *operation =

    [AFXMLRequestOperation XMLParserRequestOperationWithRequest:request

        success:^(NSURLRequest *request, NSHTTPURLResponse *response, NSXMLParser *XMLParser) {

            //self.xmlWeather = [NSMutableDictionary dictionary];

            XMLParser.delegate = self;

            [XMLParser setShouldProcessNamespaces:YES];

            [XMLParser parse];

        }

        failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, NSXMLParser *XMLParser) {

            UIAlertView *av = [[UIAlertView alloc] initWithTitle:@"Error Retrieving Weather"

                                                         message:[NSString stringWithFormat:@"%@",error]

                                                        delegate:nil

                                               cancelButtonTitle:@"OK"

                                               otherButtonTitles:nil];

            [av show];

    }];

    [operation start];

}

到现在为止，这看起来跟之前处理JSON和plist很类似。最大的改动就是在成功块（success block）中, 在这里不会传递给你一个预处理好的NSDictionary对象. 而是AFXMLRequestOperation实例化的NSXMLParse对象，这个对象将用来处理繁重的XML解析任务。

NSXMLParse对象有一组delegate方法是你需要实现的 — 用来获得XML数据。注意，在上面的代码中我将XMLParser的delegate设置为self, 因此WTTableViewController将用来处理XML的解析任务。

下载图片

UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 100.0f, 100.0f)];

[imageView setImageWithURL:[NSURL URLWithString:@"http://i.imgur.com/r4uwx.jpg"] placeholderImage:[UIImage imageNamed:@"placeholder-avatar"]];

- (IBAction)updateBackgroundImage:(id)sender {

    //Store this image on the same server as the weather canned files

    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.scott-sherwood.com/wp-content/uploads/2013/01/scene.png"]];

    AFImageRequestOperation *operation = [AFImageRequestOperation imageRequestOperationWithRequest:request

        imageProcessingBlock:nil

        success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image) {

            self.backgroundImageView.image = image;

            [self saveImage:image withFilename:@"background.png"];

        }

        failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error) {

            NSLog(@"Error %@",error);

    }];

    [operation start];

}

-(void)saveImage:(UIImage *)image withFilename:(NSString *)filename{

    NSString *path;

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

    path = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"WeatherHTTPClientImages/"];

    BOOL isDir;

    if(![[NSFileManager defaultManager] fileExistsAtPath:path isDirectory:&isDir]){

        if(!isDir){

            NSError *error;

            [[NSFileManager defaultManager] createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:&error];

            NSLog(@"%@",error);

        }

    }

    path = [path stringByAppendingPathComponent:filename];

    NSData *imageData = UIImagePNGRepresentation(image);

    NSLog(@"Written: %d",[imageData writeToFile:path atomically:YES]);

}

AFHTTPClient

AFHTTPClient一般是给它设置一个基本的URL，然后用AFHTTPClient进行多个请求（而不是像之前的那样，每次请求的时候，都创建一个AFHTTPClient）。

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{

    if(buttonIndex==0){

        NSURL *baseURL = [NSURL URLWithString:[NSString stringWithFormat:BaseURLString]];

        NSDictionary *parameters = [NSDictionary dictionaryWithObject:@"json" forKey:@"format"];

        AFHTTPClient *client = [[AFHTTPClient alloc] initWithBaseURL:baseURL];

        [client registerHTTPOperationClass:[AFJSONRequestOperation class]];

        [client setDefaultHeader:@"Accept" value:@"application/json"];

        [client postPath:@"weather.php"

              parameters:parameters

                 success:^(AFHTTPRequestOperation *operation, id responseObject) {

                     self.weather = responseObject;

                     self.title = @"HTTP POST";

                     [self.tableView reloadData];

                 }

                 failure:^(AFHTTPRequestOperation *operation, NSError *error) {

                     UIAlertView *av = [[UIAlertView alloc] initWithTitle:@"Error Retrieving Weather"

                                                                  message:[NSString stringWithFormat:@"%@",error]

                                                                 delegate:nil

                                                        cancelButtonTitle:@"OK" otherButtonTitles:nil];

                     [av show];

                 }

         ];

    }

    else if (buttonIndex==1){

        NSURL *baseURL = [NSURL URLWithString:[NSString stringWithFormat:BaseURLString]];

        NSDictionary *parameters = [NSDictionary dictionaryWithObject:@"json" forKey:@"format"];

        AFHTTPClient *client = [[AFHTTPClient alloc] initWithBaseURL:baseURL];

        [client registerHTTPOperationClass:[AFJSONRequestOperation class]];

        [client setDefaultHeader:@"Accept" value:@"application/json"];

        [client getPath:@"weather.php"

             parameters:parameters

                success:^(AFHTTPRequestOperation *operation, id responseObject) {

                    self.weather = responseObject;

                    self.title = @"HTTP GET";

                    [self.tableView reloadData];

                }

                failure:^(AFHTTPRequestOperation *operation, NSError *error) {

                    UIAlertView *av = [[UIAlertView alloc] initWithTitle:@"Error Retrieving Weather"

                                                                 message:[NSString stringWithFormat:@"%@",error]

                                                                delegate:nil

                                                       cancelButtonTitle:@"OK" otherButtonTitles:nil];

                    [av show];

                }

         ];

    }

}

构建一个baseURL，以及一个参数字典，并将这两个变量传给AFHTTPClient.
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。
做了一个GET请求，这个请求有一对block：success和failure。
POST请求跟GET一样。

上传一个文件

NSURL *url = [NSURL URLWithString:@"http://api-base-url.com"];

AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:url];

NSData *imageData = UIImageJPEGRepresentation([UIImage imageNamed:@"avatar.jpg"], 0.5);

NSMutableURLRequest *request = [httpClient multipartFormRequestWithMethod:@"POST" path:@"/upload" parameters:nil constructingBodyWithBlock: ^(id <AFMultipartFormData>formData) {

    [formData appendPartWithFileData:imageData name:@"avatar" fileName:@"avatar.jpg" mimeType:@"image/jpeg"];

}];

AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];

[operation setUploadProgressBlock:^(NSUInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToWrite) {

    NSLog(@"Sent %lld of %lld bytes", totalBytesWritten, totalBytesExpectedToWrite);

}];

[httpClient enqueueHTTPRequestOperation:operation];

下载一个文件

NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://localhost:8080/encode"]];

AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];

operation.inputStream = [NSInputStream inputStreamWithFileAtPath:[[NSBundle mainBundle] pathForResource:@"large-image" ofType:@"tiff"]];

operation.outputStream = [NSOutputStream outputStreamToMemory];

[operation start];

参考：

http://www.raywenderlich.com/zh-hans/36079/afnetworking%E9%80%9F%E6%88%90%E6%95%99%E7%A8%8B%EF%BC%881%EF%BC%89