ios - NSMutableString的appendFormat不能追加多个项

Question

我使用了NSMutableString并使用了appendFormat函数，appendFormat设置了边界和第一个图像，并且没有追加任何其他项目，我不知道错误在哪里。
导致调试:-

2016-03-08 15:52:56.385 PropertyTurkey [474:82387]
正文----- = ----- 011000010111000001101001

Content-Disposition:表单数据； name =“image []”;
filename =“/ var / mobile / Containers / Data / Application / A3EA5D3E-377E-4E16-9541-580BB57E211E / Documents / 1.jpg”

ÿØÿà

NSDictionary *headers = @{ @"content-type": @"multipart/form-data; boundary=---011000010111000001101001",
                                   @"cache-control": @"no-cache" };
        NSArray *parameters = @[ @{ @"name": @"image[]", @"fileName":[NSString stringWithFormat:@"%@",_chosenImagesPath[0]]},
                                 @{ @"name": @"image[]", @"fileName":[NSString stringWithFormat:@"%@",_chosenImagesPath[1]]},
                                 @{ @"name": @"image[]", @"fileName":[NSString stringWithFormat:@"%@",_chosenImagesPath[2]]},
                                 @{ @"name": @"image[]", @"fileName":[NSString stringWithFormat:@"%@",_chosenImagesPath[3]]},
                                 @{ @"name": @"image[]", @"fileName":[NSString stringWithFormat:@"%@",_chosenImagesPath[4]]},
                                 @{ @"name": @"rea_title", @"value": [NSString stringWithFormat:@"%@",_realEstateTitle] },
                                 @{ @"name": @"why_buy_property", @"value": @"why_buy_property" },
                                 @{ @"name": @"cit_id", @"value": [NSString stringWithFormat:@"%@",_cit_id]  },
                                 @{ @"name": @"are_id", @"value": [NSString stringWithFormat:@"%@",_are_id] },
                                 @{ @"name": @"garden_exterior", @"value":[NSString stringWithFormat:@"%@",_desOfGardenAndExter] },
                                 @{ @"name": @"home_interior", @"value":[NSString stringWithFormat:@"%@",_desOfHomeInterior] },
                                 @{ @"name": @"property_desc", @"value":[NSString stringWithFormat:@"The property desc field is required."] },
                                 @{ @"name": @"typ_id", @"value": [NSString stringWithFormat:@"%@",_typ_id] },
                                 @{ @"name": @"rea_bedrooms", @"value": [NSString stringWithFormat:@"%@",_bedrooms] },
                                 @{ @"name": @"rea_bathrooms", @"value": [NSString stringWithFormat:@"%@",_bathrooms]},
                                 @{ @"name": @"rea_living_space", @"value": [NSString stringWithFormat:@"%@",_livingSpaceSqm] },
                                 @{ @"name": @"sta_id", @"value": [NSString stringWithFormat:@"%@",_sta_id]},
                                 @{ @"name": @"rea_price", @"value": [NSString stringWithFormat:@"%@",_price]} ];

        NSString *boundary = @"---011000010111000001101001";

        NSError *error;
        NSMutableString *body = [[NSMutableString alloc]init];
        for (NSDictionary *param in parameters) {
        [body appendFormat:@"--%@\r\n", boundary];
            if (param[@"fileName"]) {
                [body appendFormat:@"Content-Disposition:form-data; name=\"%@\"; filename=\"%@\"\r\n", param[@"name"], param[@"fileName"]];
                //[body appendFormat:@"Content-Type: %@\r\n\r\n", headers[@"content-type"]];
                NSLog(@"%@",headers[@"content-type"]);
                [body appendFormat:@"%@", [NSString stringWithContentsOfFile:param[@"fileName"] encoding:NSISOLatin1StringEncoding error:&error]];
                if (error) {
                    NSLog(@"%@", error);
                }
            } else {
                [body appendFormat:@"Content-Disposition:form-data; name=\"%@\"\r\n\r\n", param[@"name"]];
                [body appendFormat:@"%@", param[@"value"]];
            }
            NSLog(@"Body-----=%@",body);
        }
        [body stringByAppendingFormat:@"\r\n--%@--\r\n", boundary];
        NSData *postData = [body dataUsingEncoding:NSUTF8StringEncoding];

        NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://192.168.1.123/api/v1/sellProperty?api_key=%@&auth_token=%@&device_token=%@",apiKey,check,deviceToken]]
                                                               cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                           timeoutInterval:10.0];
        [request setHTTPMethod:@"POST"];
        [request setAllHTTPHeaderFields:headers];
         NSLog(@"%@",headers);

        [request setHTTPBody:postData];

        NSURLSession *session = [NSURLSession sharedSession];
        NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request
                                                    completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
                                                        if (error) {
                                                            NSLog(@"%@", error);
                                                        } else {
                                                             NSDictionary *serializedData = [NSJSONSerialization JSONObjectWithData: data options:kNilOptions error:nil];
                                                            NSHTTPURLResponse* httpResponse = (NSHTTPURLResponse*)response;
                                                            NSLog(@"%@", httpResponse);
                                                             NSLog(@"res %@ serializedData %@", response,serializedData);

                                                        }
                                                    }];
        [dataTask resume];

Answer 1

您正在使用stringByAppendingFormat来创建一个新字符串，而不向现有字符串添加任何内容。