ios 对于AFNetworking3.0的基本使用

AFNetworking在3.0版本中删除了基于 NSURLConnection API的所有支持。AFHTTPRequestOperationManager已经抛弃，所以需要对数据请求进行改动。

Get请求

 //使用代码
 AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
     manager.responseSerializer = [AFHTTPResponseSerializer serializer];
     [manager GET:url parameters:nil success:^(NSURLSessionDataTask *task, id responseObject) {
         //成功
         NSDictionary *obj = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingMutableContainers error:nil];
     } failure:^(NSURLSessionDataTask *task, NSError *error) {
         //失败
     }];

• 当我们调用get函数之前,我们需要创建一个AFHTTPSessionManager,在之前我们使用的一般是AFHTTPRequestOperationManager.
   
• 在调用get请求后,我们一般都不需要干什么了,因为那些繁琐复杂的网络通信都交给他去做了,他首先会调用AFNetworkReachabilityManager验证是否联网.
• 然后参数序列化,用于网络请求.
• 调用AFSecurityPolicy类,AFSecurityPolicy用于验证HTTPS请求的证书,简单来说建立连接.
• 连接建立完成,证书验证成功,开始请求服务器.
• 从服务器返回数据,解析服务器数据,将数据反序列化.
• 我们得到data类型的数据,可以使用JSON解析直接解析成字典使用.弃用的类：

•     AFURLConnectionOperation
      AFHTTPRequestOperation
      AFHTTPRequestOperationManager

• 两者之间对比

  AFN2.0：

  NSURL *URL = [NSURL URLWithString:@""];
  NSURLRequest *request = [NSURLRequest requestWithURL:URL];
  AFHTTPRequestOperation *op = [[AFHTTPRequestOperation alloc] initWithRequest:request];
  op.responseSerializer = [AFJSONResponseSerializer serializer];
  [op setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
          NSLog(@"JSON: %@", responseObject);
  } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
          NSLog(@"Error: %@", error);
  }];
  [[NSOperationQueue mainQueue] addOperation:op];

  AFN3.0：

• - (void)GETUrl:(NSString *)url parameters:(NSDictionary *)parameters success:(void (^)(id))success failure:(void (^)(NSError *))failure
  {
      if (!_sessionGetManager) {
          _sessionGetManager  = [AFHTTPSessionManager manager];
          //设置请求格式
          _sessionGetManager.responseSerializer = [AFJSONResponseSerializer serializer];;
      }
      // 设置请求超时时间
      //    _sessionGetManager.requestSerializer.timeoutInterval = 10;
      //设置允许接受返回数据类型
          _sessionGetManager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json", @"text/html", @"text/json",@"text/plain", @"text/javascript", nil];
      NSLog(@"%@",url);
      [_sessionGetManager GET:url parameters:parameters progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
          success(responseObject);
      } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
          NSLog(@"********%@",error);
          //        if (task.state == 2) {
          //            return ;
          //        }
          failure(error);
      }];
  
  }

• - (void)POSTUrl:(NSString *)url parameters:(NSDictionary *)parameters success:(void (^)(id))success failure:(void (^)(NSError *))failure
  {
      if (!_sessionPostManager) {
          _sessionPostManager = [AFHTTPSessionManager manager];
          //接收数据类型 --->JSON
          _sessionPostManager.responseSerializer = [AFJSONResponseSerializer serializer];
  
      }
      //接收数据类型 --->JSON
      _sessionPostManager.responseSerializer = [AFJSONResponseSerializer serializer];
      //访问超时时间
      _sessionPostManager.requestSerializer.timeoutInterval = .f;
  
      _sessionPostManager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json", @"text/json", @"text/javascript", @"text/html",@"text/plain",nil];
      NSLog(@"url =%@",url);
  
      [_sessionPostManager POST:url parameters:parameters progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
          success(responseObject);
  
      } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
          NSLog(@"%@",error);
          failure(error);
      }];
  
  }

  AFN3.0下载方法：

  /**
   *  AFN3.0 下载
   */
  - (void)downLoad{
  
      //1.创建管理者对象
      AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
      //2.确定请求的URL地址
      NSURL *url = [NSURL URLWithString:@""
  
  //如果报接受类型不一致请替换一致text/html或别的
      manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"text/html"];
  
  ]; //3.创建请求对象 NSURLRequest *request = [NSURLRequest requestWithURL:url]; //下载任务 NSURLSessionDownloadTask *task = [manager downloadTaskWithRequest:request progress:^(NSProgress * _Nonnull downloadProgress) { //打印下下载进度 WKNSLog(@"%lf",1.0 * downloadProgress.completedUnitCount / downloadProgress.totalUnitCount); } destination:^NSURL * _Nonnull(NSURL * _Nonnull targetPath, NSURLResponse * _Nonnull response) { //下载地址 WKNSLog(@"默认下载地址:%@",targetPath); //设置下载路径，通过沙盒获取缓存地址，最后返回NSURL对象 NSString *filePath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)lastObject]; return [NSURL URLWithString:filePath];
  
  } completionHandler:^(NSURLResponse * _Nonnull response, NSURL * _Nullable filePath, NSError * _Nullable error) {
  
          //下载完成调用的方法
          WKNSLog(@"下载完成：");
          WKNSLog(@"%@--%@",response,filePath);
  
      }];
  
      //开始启动任务
      [task resume];
  
  }

  监测当前网络状态（网络监听）

  - (void)AFNetworkStatus{
  
      //1.创建网络监测者
      AFNetworkReachabilityManager *manager = [AFNetworkReachabilityManager sharedManager];
  
      /*枚举里面四个状态  分别对应 未知 无网络 数据 WiFi
       typedef NS_ENUM(NSInteger, AFNetworkReachabilityStatus) {
           AFNetworkReachabilityStatusUnknown          = -1,      未知
           AFNetworkReachabilityStatusNotReachable     = 0,       无网络
           AFNetworkReachabilityStatusReachableViaWWAN = 1,       蜂窝数据网络
           AFNetworkReachabilityStatusReachableViaWiFi = 2,       WiFi
       };
       */
  
      [manager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
          //这里是监测到网络改变的block  可以写成switch方便
          //在里面可以随便写事件
          switch (status) {
              case AFNetworkReachabilityStatusUnknown:
                  WKNSLog(@"未知网络状态");
                  break;
              case AFNetworkReachabilityStatusNotReachable:
                  WKNSLog(@"无网络");
                  break;
  
              case AFNetworkReachabilityStatusReachableViaWWAN:
                  WKNSLog(@"蜂窝数据网");
  
                  break;
  
              case AFNetworkReachabilityStatusReachableViaWiFi:
                  WKNSLog(@"WiFi网络");
  
                  break;
  
              default:
                  break;
          }
  
      }] ;
  }

  AFN3.0 上传

• /**
   *  AFN 3.0 上传
   *      有两种方式
   *          upLoad1 和 upLoad2
   */
  
  //第一种方法是通过工程中的文件进行上传
  - (void)upLoad1{
  
      //1。创建管理者对象
      AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
  
      //2.上传文件
      NSDictionary *dict = @{@"username":@""};
  
      NSString *urlString = @"";
      [manager POST:urlString parameters:dict constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {
          //上传文件参数
          UIImage *iamge = [UIImage imageNamed:@"123.png"];
          NSData *data = UIImagePNGRepresentation(iamge);
          //这个就是参数
          [formData appendPartWithFileData:data name:@"file" fileName:@"123.png" mimeType:@"image/png"];
  
      } progress:^(NSProgress * _Nonnull uploadProgress) {
  
          //打印下上传进度
          WKNSLog(@"%lf",1.0 *uploadProgress.completedUnitCount / uploadProgress.totalUnitCount);
      } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
  
          //请求成功
          WKNSLog(@"请求成功：%@",responseObject);
  
      } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
  
          //请求失败
          WKNSLog(@"请求失败：%@",error);
      }];
  
  }
  
  //第二种是通过URL来获取路径，进入沙盒或者系统相册等等
  - (void)upLoda2{
      //1.创建管理者对象
      AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
      //2.上传文件
      NSDictionary *dict = @{@"username":@""};
  
      NSString *urlString = @"";
      [manager POST:urlString parameters:dict constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {
  
          [formData appendPartWithFileURL:[NSURL fileURLWithPath:@"文件地址"] name:@"file" fileName:@"1234.png" mimeType:@"application/octet-stream" error:nil];
      } progress:^(NSProgress * _Nonnull uploadProgress) {
  
          //打印下上传进度
          WKNSLog(@"%lf",1.0 *uploadProgress.completedUnitCount / uploadProgress.totalUnitCount);
      } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
  
          //请求成功
          WKNSLog(@"请求成功：%@",responseObject);
  
      } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
  
          //请求失败
          WKNSLog(@"请求失败：%@",error);
      }];
  }

  总结的也不一定全面，还需要各位同僚共同努力，如有什么疑问，请加我扣扣：1123231279

• 最后附上Github地址：https://github.com/wy08/RequestModel