AFNetworking了解

AFNetworking是一个讨人喜欢的网络库,适用于iOS以及Mac OS X. 它构建于在NSURLConnection, NSOperation, 以及其他熟悉的Foundation技术之上. 它拥有良好的架构,丰富的api,以及模块化构建方式,使得使用起来非常轻松.例如,他可以使用很轻松的方式从一个url来得到json数据:

  
  
  
  

   
   
   
   
 
    
 
     
 
      
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NSURL *url = [NSURL URLWithString:@"http://api.twitter.com/1/statuses/public_timeline.json"];
 
     
 
     
 
      
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NSURLRequest *request = [NSURLRequest requestWithURL:url];
 
     
 
     
 
      
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AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
 
     
 
     
 
      
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    NSLog(@"Public Timeline: %@", JSON);
 
     
 
     
 
      
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} failure:nil];
 
     
 
     
 
      
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[operation start];
 
     
 
    
 
   
  
  
  
  

如何开始使用

• 下载 AFNetworking 然后尝试使用里面的例子
• 阅读 “Getting Started” guide, FAQ, 或者 other articles in the wiki
• 查看 完整的文档
• 查看 NSScreencast episode about AFNetworking 来得到一个快速的参考,以快速的应用到你的app中
• 有问题? Stack Overflow 是最好的地方来找到答案

综述

CORE:

AFURLConnectionOperation:一个 NSOperation 实现了NSURLConnection 的代理方法.

HTTP Requests:

AFHTTPRequestOperation:AFURLConnectionOperation的子类,当request使用的协议为HTTP和HTTPS时,它压缩了用于决定request是否成功的状态码和内容类型.

AFJSONRequestOperation:AFHTTPRequestOperation的一个子类,用于下载和处理jason response数据.

AFXMLRequestOperation:AFHTTPRequestOperation的一个子类,用于下载和处理xml response数据.

AFPropertyListRequestOperation:AFHTTPRequestOperation的一个子类,用于下载和处理property list response数据.

HTTP CLIENT:

AFHTTPClient:捕获一个基于http协议的网络应用程序的公共交流模式.包含:

• 使用基本的url相关路径来只做request
• 为request自动添加设置http headers.
• 使用http 基础证书或者OAuth来验证request
• 为由client制作的requests管理一个NSOperationQueue
• 从NSDictionary生成一个查询字符串或http bodies.
• 从request中构建多部件
• 自动的解析http response数据为相应的表现数据
• 在网络可达性测试用监控和响应变化.

IMAGES

AFImageRequestOperation:一个AFHTTPRequestOperation的子类,用于下载和处理图片.

UIImageView+AFNetworking:添加一些方法到UIImageView中,为了从一个URL中异步加载远程图片

例子程序

XML REQUEST

  
  
  
  

   
   
   
   
 
    
 
     
 
      
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NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://api.flickr.com/services/rest/?method=flickr.groups.browse&api_key=b6300e17ad3c506e706cb0072175d047&cat_id=34427469792%40N01&format=rest"]];
 
     
 
     
 
      
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AFXMLRequestOperation *operation = [AFXMLRequestOperation XMLParserRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, NSXMLParser *XMLParser) {
 
     
 
     
 
      
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  XMLParser.delegate = self;
 
     
 
     
 
      
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  [XMLParser parse];
 
     
 
     
 
      
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} failure:nil];
 
     
 
     
 
      
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[operation start];
 
     
 
    
 
   
  
  
  
  

IMAGE REQUEST

  
  
  
  

   
   
   
   
 
    
 
     
 
      
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UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 100.0f, 100.0f)];
 
     
 
     
 
      
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[imageView setImageWithURL:[NSURL URLWithString:@"http://i.imgur.com/r4uwx.jpg"] placeholderImage:[UIImage imageNamed:@"placeholder-avatar"]];
 
     
 
    
 
   
  
  
  
  

API CLIENT REQUEST

  
  
  
  

   
   
   
   
 
    
 
     
 
      
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// AFGowallaAPIClient is a subclass of AFHTTPClient, which defines the base URL and default HTTP headers for NSURLRequests it creates
 
     
 
     
 
      
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[[AFGowallaAPIClient sharedClient] getPath:@"/spots/9223" parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
 
     
 
     
 
      
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    NSLog(@"Name: %@", [responseObject valueForKeyPath:@"name"]);
 
     
 
     
 
      
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    NSLog(@"Address: %@", [responseObject valueForKeyPath:@"address.street_address"]);
 
     
 
     
 
      
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} failure:nil];
 
     
 
    
 
   
  
  
  
  

FILE UPLOAD WITH PROGRESS CALLBACK

  
  
  
  

   
   
   
   
 
    
 
     
 
      
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NSURL *url = [NSURL URLWithString:@"http://api-base-url.com"];
 
     
 
     
 
      
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AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:url];
 
     
 
     
 
      
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NSData *imageData = UIImageJPEGRepresentation([UIImage imageNamed:@"avatar.jpg"], 0.5);
 
     
 
     
 
      
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NSMutableURLRequest *request = [httpClient multipartFormRequestWithMethod:@"POST" path:@"/upload" parameters:nil constructingBodyWithBlock: ^(id <AFMultipartFormData>formData) {
 
     
 
     
 
      
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    [formData appendPartWithFileData:imageData name:@"avatar" fileName:@"avatar.jpg" mimeType:@"image/jpeg"];
 
     
 
     
 
      
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}];
 
     
 
     
 
      
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AFHTTPRequestOperation *operation = [[[AFHTTPRequestOperation alloc] initWithRequest:request] autorelease];
 
     
 
     
 
      
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[operation setUploadProgressBlock:^(NSInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToWrite) {
 
     
 
     
 
      
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    NSLog(@"Sent %lld of %lld bytes", totalBytesWritten, totalBytesExpectedToWrite);
 
     
 
     
 
      
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}];
 
     
 
     
 
      
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[operation start];
 
     
 
    
 
   
  
  
  
  

STREAMING REQUEST

  
  
  
  

   
   
   
   
 
    
 
     
 
      
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NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://localhost:8080/encode"]];
 
     
 
     
 
      
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AFHTTPRequestOperation *operation = [[[AFHTTPRequestOperation alloc] initWithRequest:request] autorelease];
 
     
 
     
 
      
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operation.inputStream = [NSInputStream inputStreamWithFileAtPath:[[NSBundle mainBundle] pathForResource:@"large-image" ofType:@"tiff"]];
 
     
 
     
 
      
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operation.outputStream = [NSOutputStream outputStreamToMemory];
 
     
 
     
 
      
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[operation start];