如何使用AF上传图片到服务器

[manager POST:evaluateHousekeepingService parameters:param constructingBodyWithBlock:^(id _Nonnull formData) {

        for (int i = 0 ; i < [rateImageArray count] - 1; i++) {
            UIImage *repairImage = [rateImageArray objectAtIndex:i];

            NSData * data = UIImageJPEGRepresentation(repairImage, 0.8);


            NSDateFormatter *formatter = [[NSDateFormatter alloc] init];

            formatter.dateFormat = @"yyyy-MM-dd HH:mm:ss:SSS";

            NSString *fileName = [NSString stringWithFormat:@"%@%@.jpg",[formatter stringFromDate:[NSDate date]],@(imgCount)];

            [formData appendPartWithFileData:data name:[NSString stringWithFormat:@"uploadFile%@",@(imgCount)] fileName:fileName mimeType:@"image/jpg"];

            imgCount++;

            }

    } progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {

        @try {

        } @catch (NSException *exception) {
             [NdUncaughtExceptionHandler TakeException:exception];
        } @finally {

        }



    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {


    }];
}