多张图片上传

多张图片上传，可判断哪张上传成功或者失败，以及所有上传完成的回调

- (void)uploadTaskWithImage:(UIImage*)image success:(void (^)(NSURLSessionDataTask *task, id responseObject))success
                    failure:(void (^)(NSURLSessionDataTask *task, NSError *error))failure{
    // 构造 NSURLRequest
//            Request *request = [self requestWithImage:imageTmp url:R_UploadImage_do params:dict filename:nil name:@"myFile" showHUDMessage:nil];
    NSString *uploadUrl = [R_BASE_URL stringByAppendingString:R_UploadImage_do];
    NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithObjectsAndKeys:@"financing",@"fileDirectory", nil];
    [dict setObject:GlobalData.loginInfo.token forKey:@"token"];
    [dict setObject:GlobalData.loginInfo.intermediaryId forKey:@"intermediaryId"];
    AFHTTPSessionManager *manager = [RequestHandler sharedInstance].manager;
    manager.requestSerializer.timeoutInterval = 5 * 60;
     [manager POST:uploadUrl parameters:dict constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {
         
        NSData *imageData = UIImageJPEGRepresentation(image, 0.4);
        
        NSLog(@"____%ld",imageData.length);//481300\349595
        NSString *imageFileName = nil;
            NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
            formatter.dateFormat = @"yyyyMMddHHmmss";
            NSString *str = [formatter stringFromDate:[NSDate date]];
            imageFileName = [NSString stringWithFormat:@"%@.jpg", str];
        
        [formData appendPartWithFileData:imageData name:@"myFile" fileName:imageFileName mimeType:@"image/jpeg"];
        //        UIImage *imag = [UIImage imageNamed:@"limite"];
        //        NSData *da = UIImageJPEGRepresentation(imag, 0.8);
        //         [formData appendPartWithFileData:da name:name fileName:@"1" mimeType:@"image/jpeg"];
    } progress:^(NSProgress * _Nonnull uploadProgress) {
        NSLog(@"****____%f",(double)uploadProgress.completedUnitCount/uploadProgress.totalUnitCount);

    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
    
        
        success(task,responseObject);
        
        
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        
        failure(task,error);
    }];
}





- (void)runDispatchTest:(id)sender {
    // 需要上传的数据
    NSArray *imageArray = @[@"updateAppBackImage",@"pic1",@"pic2",@"pic3",@"pic4",@"updateAppBackImage",@"pic1",@"pic2",@"pic3",@"pic4",@"updateAppBackImage",@"pic1",@"pic2",@"pic3",@"pic4",@"updateAppBackImage",@"pic1",@"pic2",@"pic3",@"pic4",@"updateAppBackImage",@"pic1",@"pic2",@"pic3",@"pic4",@"updateAppBackImage",@"pic1",@"pic2",@"pic3",@"pic4",@"updateAppBackImage",@"pic1",@"pic2",@"pic3",@"pic4",@"updateAppBackImage",@"pic1",@"pic2",@"pic3",@"pic4",@"updateAppBackImage",@"pic1",@"pic2",@"pic3",@"pic4",@"updateAppBackImage",@"pic1",@"pic2",@"pic3",@"pic4",@"updateAppBackImage",@"pic1",@"pic2",@"pic3",@"pic4",@"updateAppBackImage",@"pic1",@"pic2",@"pic3",@"pic4",@"updateAppBackImage",@"pic1",@"pic2",@"pic3",@"pic4",@"updateAppBackImage",@"pic1",@"pic2",@"pic3",@"pic4",@"updateAppBackImage",@"pic1",@"pic2",@"pic3",@"pic4",@"updateAppBackImage",@"pic1",@"pic2",@"pic3",@"pic4",@"updateAppBackImage",@"pic1",@"pic2",@"pic3",@"pic4",@"updateAppBackImage",@"pic1",@"pic2",@"pic3",@"pic4",@"updateAppBackImage",@"pic1",@"pic2",@"pic3",@"pic4",@"updateAppBackImage",@"pic1",@"pic2",@"pic3",@"pic4",@"updateAppBackImage",@"pic1",@"pic2",@"pic3",@"pic4",@"updateAppBackImage",@"pic1",@"pic2",@"pic3",@"pic4"];
    
    NSMutableArray *images = [NSMutableArray array];
    NSMutableArray* result = [NSMutableArray array];
    NSLog(@"%ld",imageArray.count);
    for (NSString *img in imageArray) {
        [images addObject:[UIImage imageNamed:img]];
        [result addObject:[NSNull null]];

    }


    dispatch_group_t group = dispatch_group_create();
    
    for (NSInteger i = 0; i < images.count; i++) {
        
        dispatch_group_enter(group);
        
        [self uploadTaskWithImage:images[i]  success:^(NSURLSessionDataTask *task, id responseObject) {
            NSLog(@"第 %d 张图片上传成功: %@", (int)i + 1, @"");
            @synchronized (result) { 
                result[i] = responseObject;
            }
            dispatch_group_leave(group);
        } failure:^(NSURLSessionDataTask *task, NSError *error) {
            NSLog(@"第 %d 张图片上传失败: %@", (int)i + 1, error);
            dispatch_group_leave(group);
        }];
        
    }
    
    dispatch_group_notify(group, dispatch_get_main_queue(), ^{
        NSLog(@"上传完成!");
        for (id response in result) {
            NSLog(@"%@", response);
        }
    });
}