iOS关于多张图片上传、地址返回顺序问题及解决方案

dispatch_group_t group = dispatch_group_create();
  for(..){
    dispatch_group_async(group,dispatch_get_global_queue(0, 0), ^{
    NSLog(@"队列组：有一个耗时操作完成！");
    });
   }
  dispatch_group_notify(group, dispatch_get_main_queue(), ^{
    NSLog(@"队列组：前面的耗时操作都完成了，回到主线程进行相关操作");
  });

// 建立这个类的目的、主要是为了for循环多张图片上传、成功后回来的地址顺序问题
#import 
@interface FMUploadModel : NSObject
//根据自己的上传函数需要决定
@property (nonatomic,strong) NSArray * dataArray;
@property (nonatomic,copy) NSString *imgUrl;
@end
function
//开辟一个多线程 执行图片上传工作
      dispatch_queue_t queue = dispatch_queue_create("upimgs", DISPATCH_QUEUE_CONCURRENT);
      dispatch_async(queue, ^{
        // 耗时操作放在这里
        __weak typeof(self) weakself = self;
        __block int finishNum = 0;
        for (int i = 0 ; i < self.selectImgs.count; i++) {
          YRFormData *getData = [[YRFormData alloc] init];
          getData.data = UIImagePNGRepresentation(self.selectImgs[i]);
          getData.name = @"uzee_image";
          getData.filename = @"head.png";
          getData.mimeType = @"image/png";
          NSArray *array = @[getData];
          //***********//
          FMUploadModel *model = [FMUploadModel new];
          model.dataArray = array;
          model.imgUrl = @"";
          [models addObject:model];
          /*******其实是一张一张传的，传数组是调用这个方法**********/
          [YRHttpTool postWithURLNoAES:@"*****" params:@{} formDataArray:model.dataArray success:^(id json) {
            finishNum ++ ;
            model.imgUrl = json[@"response"][@"cloud"];
            if (finishNum == self.selectImgs.count) {
              dispatch_async(dispatch_get_main_queue(), ^{
                // 回到主线程进行UI操作
                [MBProgressHUD hideHUDForView:weakself.view];
                updateImage();
              });
            }
          } failure:^(NSError *error) {
            dispatch_async(dispatch_get_main_queue(), ^{
              // 回到主线程进行UI操作
              [MBProgressHUD hideHUDForView:weakself.view];
              [MBProgressHUD showError:@"图片上传失败，请稍后再试" toView:self.view];
            });
          } progress:^(NSProgress *progress) {
            [[NSOperationQueue mainQueue] addOperationWithBlock:^{
              float value = 1.0 *progress.completedUnitCount / progress.totalUnitCount;
              [MBProgressHUD showDownload:@"发布中..." toView:weakself.view progress:value];
            }];
          }];
        }
      });