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AFNetworking 使用总结 (用法+JSON解析

2015-07-10 21:54 666 查看
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 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
#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
[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@N01&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 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];



From:http://www.coneboy.com/?p=716

这几天在评论页面的时候发现get请求后加入2个以上的汉字会出现BadURL提示,断点调试发现是多中文字符惹的祸,所以在URL使用以前先转码成UTF-8即可

这里顺便说明下自己使用AFNetworking 的常用方法。
目前我只是用到

#import “AFHTTPClient.h”;

#import “AFHTTPRequestOperation.h”

这两个类
发起一个请求

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NSString *URLTmp = @”http://www.coneboy.com”;

NSString *URLTmp1 = [URLTmp stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; //转码成UTF-8 否则可能会出现错误

URLTmp = URLTmp1;

NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString: URLTmp]];

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

[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {

NSLog(@"Success: %@", operation.responseString);

NSString *requestTmp = [NSString stringWithString:operation.responseString];

NSData *resData = [[NSData alloc] initWithData:[requestTmp dataUsingEncoding:NSUTF8StringEncoding]];

//系统自带JSON解析

NSDictionary *resultDic = [NSJSONSerialization JSONObjectWithData:resData options:NSJSONReadingMutableLeaves error:nil];
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {

NSLog(@”Failure: %@”, error);

[SVProgressHUD dismissWithError:@"提交失败,请重试"];

}];

[operation start];

}
AFNetworking 下载图片

AFNETWorking 下载图片是异步并且可缓存到cache里面 非常好用不会阻塞主线程。用过的都说好!而且使用也简单!

#import “UIImageView+AFNetworking.h”
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