如何使用2个参数进行POST NSURLRequest？

Question

我想添加2个参数NSURLRequest.有没有办法或者我应该使用AFnetworking？

Answer 1

如果您使用AFNetworking,可能会更容易.如果您有自己想做的事情,可以使用NSURLSession,但必须编写更多代码.

1. 如果您使用AFNetworking,它会处理序列化请求,区分成功和错误等所有这些细节:

   NSDictionary *params = @{@"firstname": @"John", @"lastname": @"Doe"};
   
   AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
   [manager POST:urlString parameters:params success:^(NSURLSessionDataTask *task, id responseObject) {
       NSLog(@"responseObject = %@", responseObject);
   } failure:^(NSURLSessionDataTask *task, NSError *error) {
       NSLog(@"error = %@", error);
   }];
   

   这假设服务器的响应是JSON.如果不是(例如,如果是纯文本或HTML),则可以在POSTwith 之前:

   manager.responseSerializer = [AFHTTPResponseSerializer serializer];
   

2. 如果你自己做NSURLSession,你可以像这样构造请求:

   NSDictionary *params = @{@"firstname": @"John", @"lastname": @"Doe"};
   
   NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
   [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
   [request setHTTPMethod:@"POST"];
   [request setHTTPBody:[self httpBodyForParameters:params]];
   

   您现在可以发起请求NSURLSession.例如,您可能会这样做:

   NSURLSessionTask *task = [[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
       if (error) {
           NSLog(@"dataTaskWithRequest error: %@", error);
       }
   
       if ([response isKindOfClass:[NSHTTPURLResponse class]]) {
           NSInteger statusCode = [(NSHTTPURLResponse *)response statusCode];
           if (statusCode != 200) {
               NSLog(@"Expected responseCode == 200; received %ld", (long)statusCode);
           }
       }
   
       // If response was JSON (hopefully you designed web service that returns JSON!),
       // you might parse it like so:
       //
       // NSError *parseError;
       // id responseObject = [NSJSONSerialization JSONObjectWithData:data options:0 error:&parseError];
       // if (!responseObject) {
       //     NSLog(@"JSON parse error: %@", parseError);
       // } else {
       //     NSLog(@"responseObject = %@", responseObject);
       // }
   
       // if response was text/html, you might convert it to a string like so:
       //
       // NSString *responseString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
       // NSLog(@"responseString = %@", responseString);
   }];
   [task resume];
   

   哪里

   /** Build the body of a `application/x-www-form-urlencoded` request from a dictionary of keys and string values
   
    @param parameters The dictionary of parameters.
    @return The `application/x-www-form-urlencoded` body of the form `key1=value1&key2=value2`
    */
   - (NSData *)httpBodyForParameters:(NSDictionary *)parameters {
       NSMutableArray *parameterArray = [NSMutableArray array];
   
       [parameters enumerateKeysAndObjectsUsingBlock:^(NSString *key, NSString *obj, BOOL *stop) {
           NSString *param = [NSString stringWithFormat:@"%@=%@", [self percentEscapeString:key], [self percentEscapeString:obj]];
           [parameterArray addObject:param];
       }];
   
       NSString *string = [parameterArray componentsJoinedByString:@"&"];
   
       return [string dataUsingEncoding:NSUTF8StringEncoding];
   }
   

   和

   /** Percent escapes values to be added to a URL query as specified in RFC 3986.
   
    See http://www.ietf.org/rfc/rfc3986.txt
   
    @param string The string to be escaped.
    @return The escaped string.
    */
   - (NSString *)percentEscapeString:(NSString *)string {
       NSCharacterSet *allowed = [NSCharacterSet characterSetWithCharactersInString:@"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-._~"];
       return [string stringByAddingPercentEncodingWithAllowedCharacters:allowed];
   }