iOS 表单形式传输Text数据

 NSString *url = [NSString stringWithFormat:@"%@%@oauth/token",AFURL,authGatway];

    NSMutableURLRequest *request = [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"POST" URLString:url parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
        
        [formData appendPartWithFormData:[@"password" dataUsingEncoding:NSUTF8StringEncoding] name:@"grant_type"];
        [formData appendPartWithFormData:[username dataUsingEncoding:NSUTF8StringEncoding] name:@"username"];
        [formData appendPartWithFormData:[password dataUsingEncoding:NSUTF8StringEncoding] name:@"password"];
        [formData appendPartWithFormData:[@"*****************" dataUsingEncoding:NSUTF8StringEncoding] name:@"client_id"];
        [formData appendPartWithFormData:[@"*****************" dataUsingEncoding:NSUTF8StringEncoding] name:@"client_secret"];
        
    } error:nil];

    AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
    
    NSURLSessionUploadTask *uploadTask;
    uploadTask = [manager
                  uploadTaskWithStreamedRequest:request
                  progress:^(NSProgress * _Nonnull uploadProgress) {
                  }
                  completionHandler:^(NSURLResponse * _Nonnull response, id  _Nullable responseObject, NSError * _Nullable error) {
                      if (error) {
                          NSLog(@"Error: %@", error);
                      } else {
                          NSLog(@" %@", responseObject);
                      }
                  }];
    
    [uploadTask resume];

      [formData appendPartWithFormData:[@"password" dataUsingEncoding:NSUTF8StringEncoding] name:@"grant_type"];

以键值对的方式向服务器传输数据