AFNetworking的学习

靳茂

2023-12-01

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:

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

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

 
        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" 
        ]];   
       
        AFXMLRequestOperation *operation = [AFXMLRequestOperation XMLParserRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, NSXMLParser *XMLParser) {   
       
        XMLParser.delegate = self;     
       
        [XMLParser parse];     
       
        } failure:nil];   
       
        [operation start];

IMAGE REQUEST

1 2	`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"` `]];`

API CLIENT REQUEST

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

FILE UPLOAD WITH PROGRESS CALLBACK

 
        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] autorelease];  
       
        [operation setUploadProgressBlock:^(NSInteger bytesWritten, 
        long 
        long 
        totalBytesWritten,  
        long 
        long 
        totalBytesExpectedToWrite) {  
       
        NSLog(@ 
        "Sent %lld of %lld bytes" 
        , totalBytesWritten, totalBytesExpectedToWrite);     
       
        }];   
       
        [operation start];

STREAMING REQUEST

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