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AFNetWorking能做什么

时间:2014-10-27 21:22:12      阅读:212      评论:0      收藏:0      [点我收藏+]

标签:afnetworking

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 = [NSURL URLWithString:@"https://alpha-api.app.net/stream/0/posts/stream/global"]; 
NSURLRequest *request = [NSURLRequest requestWithURL:url]; 
AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) { 
    NSLog(@"App.net Global Stream: %@", JSON); 
} failure:nil]; 
[operation start]; 
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 = [client multipartFormRequestWithMethod:@"POST" path:@"/upload" parameters:nil constructingBodyWithBlock: ^(id <AFMultipartFormData> formData) { 
  [formData appendPartWithFileData:imageData mimeType:@"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 = [NSOutputStream outputStreamToFileAtPath:@"download.zip" append:NO]; 
5.如何解决:SystemConfiguration framework not found in project 
请导入: 
#import <SystemConfiguration/SystemConfiguration.h> 
#import <MobileCoreServices/MobileCoreServices.h> 
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 
[self setShouldExecuteAsBackgroundTaskWithExpirationHandler:^{ 
}]; 
一些实例: 
1.XML 请求 
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]; 
2.图片请求: 
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"]]; 
3.图片上传处理,监测上传状态: 
didiwei  17:28:57 
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); 
}]; 
[operation start]; 
4.在线流媒体请求 
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];

AFNetWorking能做什么

标签:afnetworking

原文地址:http://blog.csdn.net/vaercly/article/details/40513983

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