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;@endfunction//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];            }];          }];        }      });