AFNetworking 使用总结 (用法+JSON解析
- 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]; } failure:^(AFHTTPRequestOperation *operation, NSError *error) { |
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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[imageView setImageWithURL:[NSURL URLWithString:URL]];
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