AFNetwork 作用和用法详解

AFNetworking是一个轻量级的iOS网络通信类库。它建立在NSURLConnection和NSOperation等类库的基础上，让很多网络通信功能的实现变得十分简单。它支持HTTP请求和基于REST的网络服务（包括GET、POST、 PUT、DELETE等）。支持ARC。

Github 地址： https://github.com/AFNetworking/AFNetworking

 //
 //  MJViewController.m
 //  03.AFN演练
 //
 //  Created by apple on 14-4-30.
 //  Copyright (c) 2014年 itcast. All rights reserved.
 //

 #import "MJViewController.h"
 #import "AFNetworking.h"

 @interface MJViewController ()

 @end

 @implementation MJViewController
 /**
  要使用常规的AFN网络访问

  1. AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

     所有的网络请求,均有manager发起

  2. 需要注意的是,默认提交请求的数据是二进制的,返回格式是JSON

     1> 如果提交数据是JSON的,需要将请求格式设置为AFJSONRequestSerializer
     2> 如果返回格式不是JSON的,

  3. 请求格式

      AFHTTPRequestSerializer            二进制格式
      AFJSONRequestSerializer            JSON
      AFPropertyListRequestSerializer    PList(是一种特殊的XML,解析起来相对容易)

  4. 返回格式

      AFHTTPResponseSerializer           二进制格式
      AFJSONResponseSerializer           JSON
      AFXMLParserResponseSerializer      XML,只能返回XMLParser,还需要自己通过代理方法解析
      AFXMLDocumentResponseSerializer (Mac OS X)
      AFPropertyListResponseSerializer   PList
      AFImageResponseSerializer          Image
      AFCompoundResponseSerializer       组合
  */

 - (void)viewDidLoad
 {
     [super viewDidLoad];

     [self reach];
 }

 #pragma mark - 演练
 #pragma mark - 检测网络连接
 - (void)reach
 {
     /**
      AFNetworkReachabilityStatusUnknown          = -1,  // 未知
      AFNetworkReachabilityStatusNotReachable     = 0,   // 无连接
      AFNetworkReachabilityStatusReachableViaWWAN = 1,   // 3G 花钱
      AFNetworkReachabilityStatusReachableViaWiFi = 2,   // 局域网络,不花钱
      */
     // 如果要检测网络状态的变化,必须用检测管理器的单例的startMonitoring
     [[AFNetworkReachabilityManager sharedManager] startMonitoring];

     // 检测网络连接的单例,网络变化时的回调方法
     [[AFNetworkReachabilityManager sharedManager] setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
         NSLog(@"%d", status);
     }];
 }

 #pragma mark - Session 下载
 - (void)sessionDownload
 {
     NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];
     AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:config];

     NSString *urlString = @"http://localhost/itcast/videos/01.C语言-语法预览.mp4";
     urlString = [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

     NSURL *url = [NSURL URLWithString:urlString];
     NSURLRequest *request = [NSURLRequest requestWithURL:url];

     NSURLSessionDownloadTask *task = [manager downloadTaskWithRequest:request progress:nil destination:^NSURL *(NSURL *targetPath, NSURLResponse *response) {
         // 指定下载文件保存的路径
 //        NSLog(@"%@ %@", targetPath, response.suggestedFilename);
         // 将下载文件保存在缓存路径中
         NSString *cacheDir = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)[0];
         NSString *path = [cacheDir stringByAppendingPathComponent:response.suggestedFilename];

         // URLWithString返回的是网络的URL,如果使用本地URL,需要注意
         NSURL *fileURL1 = [NSURL URLWithString:path];
         NSURL *fileURL = [NSURL fileURLWithPath:path];

         NSLog(@"== %@ |||| %@", fileURL1, fileURL);

         return fileURL;
     } completionHandler:^(NSURLResponse *response, NSURL *filePath, NSError *error) {
         NSLog(@"%@ %@", filePath, error);
     }];

     [task resume];
 }

 #pragma mark - POST JSON
 - (void)postJSON
 {
     AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

     NSDictionary *dict = @{@"name": @"zhangsan"};
     NSDictionary *dict1 = @{@"name": @"wangwu"};
     NSArray *array = @[dict, dict1];
     // 设置请求格式
     manager.requestSerializer = [AFJSONRequestSerializer serializer];
     // 设置返回格式
     manager.responseSerializer = [AFHTTPResponseSerializer serializer];

     [manager POST:@"http://localhost/postjson.php" parameters:array success:^(AFHTTPRequestOperation *operation, id responseObject) {
         NSString *result = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];

         NSLog(@"%@", result);
     } failure:^(AFHTTPRequestOperation *operation, NSError *error) {

     }];

 }

 #pragma mark - 随机文件名上传
 - (void)postUpload1
 {
     // 本地上传给服务器时,没有确定的URL,不好用MD5的方式处理
     AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
     manager.responseSerializer = [AFHTTPResponseSerializer serializer];

     [manager POST:@"http://localhost/demo/upload.php" parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {

         NSURL *fileURL = [[NSBundle mainBundle] URLForResource:@"头像1.png" withExtension:nil];

         // 要上传保存在服务器中的名称
         // 使用时间来作为文件名 2014-04-30 14:20:57.png
         // 让不同的用户信息,保存在不同目录中
         NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
         // 设置日期格式
         formatter.dateFormat = @"yyyy-MM-dd HH:mm:ss";
         NSString *fileName = [formatter stringFromDate:[NSDate date]];

         [formData appendPartWithFileURL:fileURL name:@"uploadFile" fileName:fileName mimeType:@"image/png" error:NULL];

     } success:^(AFHTTPRequestOperation *operation, id responseObject) {
         NSLog(@"OK");
     } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
         NSLog(@"error");
     }];
 }

 #pragma mark - POST上传
 - (void)postUpload
 {
     AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
     // AFHTTPResponseSerializer就是正常的HTTP请求响应结果:NSData
     // 当请求的返回数据不是JSON,XML,PList,UIImage之外,使用AFHTTPResponseSerializer
     // 例如返回一个html,text...
     //
     // 实际上就是AFN没有对响应数据做任何处理的情况
     manager.responseSerializer = [AFHTTPResponseSerializer serializer];

     // formData是遵守了AFMultipartFormData的对象
     [manager POST:@"http://localhost/demo/upload.php" parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {

         // 将本地的文件上传至服务器
         NSURL *fileURL = [[NSBundle mainBundle] URLForResource:@"头像1.png" withExtension:nil];

         [formData appendPartWithFileURL:fileURL name:@"uploadFile" error:NULL];
     } success:^(AFHTTPRequestOperation *operation, id responseObject) {
         NSString *result = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];

         NSLog(@"完成 %@", result);
     } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
         NSLog(@"错误 %@", error.localizedDescription);
     }];
 }

 #pragma mark - JSON
 - (void)XMLData
 {
     AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

     // 返回的数据格式是XML
     manager.responseSerializer = [AFXMLParserResponseSerializer serializer];

     NSDictionary *dict = @{@"format": @"xml"};

     // 网络访问是异步的,回调是主线程的,因此程序员不用管在主线程更新UI的事情
     [manager GET:@"http://localhost/videos.php" parameters:dict success:^(AFHTTPRequestOperation *operation, id responseObject) {

         // 如果结果是XML,同样需要使用6个代理方法解析,或者使用第三方库
         // 第三方库第三方框架,效率低,内存泄漏
         NSLog(@"%@", responseObject);
     } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
         NSLog(@"%@", error);
     }];
 }

 #pragma mark - JSON
 - (void)JSONData
 {
     AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

     // 原本需要拼接get访问URL ? & =
     NSDictionary *dict = @{@"format": @"json"};

     // 网络访问是异步的,回调是主线程的,因此程序员不用管在主线程更新UI的事情
     [manager GET:@"http://localhost/videos.php" parameters:dict success:^(AFHTTPRequestOperation *operation, id responseObject) {
         NSLog(@"%@", responseObject);
         // 提问:NSURLConnection异步方法回调,是在子线程
         // 得到回调之后,通常更新UI,是在主线程
         NSLog(@"%@", [NSThread currentThread]);
     } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
         NSLog(@"%@", error);
     }];
 }

 #pragma mark - POST登录
 - (void)postLogin
 {
     AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

     // 原本需要拼接get访问URL ? & =
     NSDictionary *dict = @{@"username": @"wangwu", @"password" : @"wang"};

     // 网络访问是异步的,回调是主线程的,因此程序员不用管在主线程更新UI的事情
     [manager POST:@"http://localhost/login.php" parameters:dict success:^(AFHTTPRequestOperation *operation, id responseObject) {
         NSLog(@"%@", responseObject);
         // 提问:NSURLConnection异步方法回调,是在子线程
         // 得到回调之后,通常更新UI,是在主线程
         NSLog(@"%@", [NSThread currentThread]);
     } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
         NSLog(@"%@", error);
     }];
 }

 #pragma mark - GET登录
 - (void)getLogin
 {
     AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

     // 原本需要拼接get访问URL ? & =
     NSDictionary *dict = @{@"username": @"wangwu", @"password" : @"wang"};

     // 网络访问是异步的,回调是主线程的,因此程序员不用管在主线程更新UI的事情
     [manager GET:@"http://localhost/login.php" parameters:dict success:^(AFHTTPRequestOperation *operation, id responseObject) {
         NSLog(@"%@", responseObject);
         // 提问:NSURLConnection异步方法回调,是在子线程
         // 得到回调之后,通常更新UI,是在主线程
         NSLog(@"%@", [NSThread currentThread]);
     } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
         NSLog(@"%@", error);
     }];
 }

 @end