转载自:http://blog.sina.com.cn/s/blog_719d537e01017x82.html
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:
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];
作者:Peter Zhan
博客园blog地址:http://www.cnblogs.com/zhanxp/
本文版权归作者和博客园所有,欢迎转载,转载请注明出处