AFNetwork作用和用法

AFNetwork是一个轻量级的网络请求api类库。是以NSURLConnection,NSOperation和其他方法为基础的。

下面这个例子是用来处理json请求的:

NSURL*url=[NSURLURLWithString:@"https://alpha-api.app.net/stream/0/posts/stream/global"];

NSURLRequest*request=[NSURLRequestrequestWithURL:url];

AFJSONRequestOperation*operation=[AFJSONRequestOperationJSONRequestOperationWithRequest:requestsuccess:^(NSURLRequest*request,NSHTTPURLResponse*response,idJSON){

NSLog(@"App.netGlobalStream:%@",JSON);

}failure:nil];

[operationstart];

使用方法:

1.下载AFNetwork,点击下载

2.将文件夹名称为AFNetworking拖入到你的工程项目即可

常见问题:

1.AFNetworking作用都有哪些?

NSURLConnection提供了+sendAsynchronousRequest:queue:completionHandler:和+sendAsynchronousRequest:queue:completionHandler:,但是AFNetworking提供了更好的功能

*AFURLConnectionOperation和它的子类继承NSOperation的,允许请求被取消,暂停/恢复和由NSOperationQueue进行管理。

*AFURLConnectionOperation也可以让你轻松得完成上传和下载,处理验证,监控上传和下载进度,控制的缓存。

*AFHTTPRequestOperation和它得子类可以基于http状态和内容列下来区分是否成功请求了

*AFNetworking可以将远程媒体数据类型(NSData)转化为可用的格式,比如如JSON,XML,图像和plist。

*AFHTTPClient提供了一个方便的网络交互接口,包括默认头,身份验证,是否连接到网络,批量处理操作,查询字符串参数序列化,已经多种表单请求

*的UIImageView+AFNetworking增加了一个方便的方法来异步加载图像。

2.AFNetworking是否支持缓存?

可以,NSURLCache及其子类提供了很多高级接口用于处理缓存

如果你想将缓存存储再磁盘,推荐使用SDURLCache

3.如何使用AFNetworking上传一个文件?

NSData*imageData=UIImagePNGRepresentation(image);

NSURLRequest*request=[clientmultipartFormRequestWithMethod:@"POST"path:@"/upload"parameters:nilconstructingBodyWithBlock:^(idformData){

[formDataappendPartWithFileData:imageDatamimeType:@"image/png"name:@"avatar"];

}];

4.如何使用AFNetworking下载一个文件?

先创建一个AFURLConnectionOperation对象,然后再使用它的属性outputStream进行处理

operation.outputStream=[NSOutputStreamoutputStreamToFileAtPath:@"download.zip"append:NO];

5.如何解决:SystemConfigurationframeworknotfoundinproject

请导入:

#import

#import

6.当应用程序退出时,如何保持持续的请求?

AFURLConnectionOperation有一个叫setShouldExecuteAsBackgroundTaskWithExpirationHandler:的方法用于处理在应用程序进入后台后,进行持续的请求

[selfsetShouldExecuteAsBackgroundTaskWithExpirationHandler:^{

}];

一些实例:

1.XML请求

NSURLRequest*request=[NSURLRequestrequestWithURL:[NSURLURLWithString:@"http://api.flickr.com/services/rest/?method=flickr.groups.browse&api_key=b6300e17ad3c506e706cb0072175d047&cat_id=34427469792@N01&format=rest"]];

AFXMLRequestOperation*operation=[AFXMLRequestOperationXMLParserRequestOperationWithRequest:requestsuccess:^(NSURLRequest*request,NSHTTPURLResponse*response,NSXMLParser*XMLParser){

XMLParser.delegate=self;

[XMLParserparse];

}failure:nil];

[operationstart];

2.图片请求:

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

[imageViewsetImageWithURL:[NSURLURLWithString:@"http://i.imgur.com/r4uwx.jpg"]placeholderImage:[UIImageimageNamed:@"placeholder-avatar"]];

3.图片上传处理,监测上传状态:

didiwei17:28:57

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

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

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

NSMutableURLRequest*request=[httpClientmultipartFormRequestWithMethod:@"POST"path:@"/upload"parameters:nilconstructingBodyWithBlock:^(idformData){

[formDataappendPartWithFileData:imageDataname:@"avatar"fileName:@"avatar.jpg"mimeType:@"image/jpeg"];

}];

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

[operationsetUploadProgressBlock:^(NSUIntegerbytesWritten,longlongtotalBytesWritten,longlongtotalBytesExpectedToWrite){

NSLog(@"Sent%lldof%lldbytes",totalBytesWritten,totalBytesExpectedToWrite);

}];

[operationstart];

4.在线流媒体请求

NSURLRequest*request=[NSURLRequestrequestWithURL:[NSURLURLWithString:@"http://localhost:8080/encode"]];

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

operation.inputStream=[NSInputStreaminputStreamWithFileAtPath:[[NSBundlemainBundle]pathForResource:@"large-image"ofType:@"tiff"]];

operation.outputStream=[NSOutputStreamoutputStreamToMemory];

[operationstart];

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