AFNetwork库的使用（个人觉得比较不错）

来源：互联网发布：如何克隆淘宝店铺编辑：程序博客网时间：2024/06/06 20:12

搞了两年多iOS开发了，网络请求这块儿，一直用的ASIHttpRequest，但是这个开源项目好长时间不维护。据说现在这块儿都兴用了AFNetwork了，学习学习，整理资料如下：
话说我学习那天(1.21)正值github被墙之日，真纠结。所以文章最下面会搁一个AFNetwork的下载地址。ok,let’s go
1.首先要把AFNetwork 导入到你的工程中就是那19个文件afnetworking 文件夹
2.然后还要在工程里面引出2个新的framwork,SystemConfiguration和MobileCoreServices
3.很重要的一步在你的”YOURPROJECTNAME-Prefix.pch”文件里添加

#import <SystemConfiguration/SystemConfiguration.h>
#import <MobileCoreServices/MobileCoreServices.h>

基本上就是这样子，然后你就可以使用了.你的工程需要什么功能就在你的class里面的头文件添加什么功能的引用
如果你出现了下面AFNETWORKING的警告的话请重复安装上面的

#else
    #warning SystemConfiguration framework not found in project, or not included in precompiled header. Network reachability functionality will not be available.
#endif
 
#ifndef __UTTYPE__
    #if __IPHONE_OS_VERSION_MIN_REQUIRED
        #warning MobileCoreServices framework not found in project, or not included in precompiled header. Automatic MIME type detection when uploading files in multipart requests will not be available.
    #else
        #warning CoreServices framework not found in project, or not included in precompiled header. Automatic MIME type detection when uploading files in multipart requests will not be available.
    #endif
#endif

常用方法举例:
1.较底层的一个封装

NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://httpbin.org/ip"]];
AFURLConnectionOperation *operation = [[AFURLConnectionOperation alloc] initWithRequest:request];
operation.completionBlock = ^ {
    NSLog(@"Complete: %@", operation.responseString);
};
[operation start];

2.基于上一个东东更高一层的封装

NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://httpbin.org/robots.txt"]];
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
    NSLog(@"Success: %@", operation.responseString);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    NSLog(@"Failure: %@", error);
}];
[operation start];

3.处理json请求

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];

4.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];

5.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"]];

6.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];

7.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];

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:^{
}];