dispatch_group_t group = dispatch_group_create();  for(..){    dispatch_group_async(group,dispatch_get_global_queue(0, 0), ^{    NSLog(@"隊(duì)列組：有一個(gè)耗時(shí)操作完成！");    });   }  dispatch_group_notify(group, dispatch_get_main_queue(), ^{    NSLog(@"隊(duì)列組：前面的耗時(shí)操作都完成了，回到主線(xiàn)程進(jìn)行相關(guān)操作");  });

// 建立這個(gè)類(lèi)的目的、主要是為了for循環(huán)多張圖片上傳、成功后回來(lái)的地址順序問(wèn)題#import @interface FMUploadModel : NSObject//根據(jù)自己的上傳函數(shù)需要決定@property (nonatomic,strong) NSArray * dataArray;@property (nonatomic,copy) NSString *imgUrl;@endfunction//開(kāi)辟一個(gè)多線(xiàn)程 執(zhí)行圖片上傳工作      dispatch_queue_t queue = dispatch_queue_create("upimgs", DISPATCH_QUEUE_CONCURRENT);      dispatch_async(queue, ^{        // 耗時(shí)操作放在這里        __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];          /*******其實(shí)是一張一張傳的，傳數(shù)組是調(diào)用這個(gè)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(), ^{                // 回到主線(xiàn)程進(jìn)行UI操作                [MBProgressHUD hideHUDForView:weakself.view];                updateImage();              });            }          } failure:^(NSError *error) {            dispatch_async(dispatch_get_main_queue(), ^{              // 回到主線(xiàn)程進(jìn)行UI操作              [MBProgressHUD hideHUDForView:weakself.view];              [MBProgressHUD showError:@"圖片上傳失敗，請(qǐng)稍后再試" toView:self.view];            });          } progress:^(NSProgress *progress) {            [[NSOperationQueue mainQueue] addOperationWithBlock:^{              float value = 1.0 *progress.completedUnitCount / progress.totalUnitCount;              [MBProgressHUD showDownload:@"發(fā)布中..." toView:weakself.view progress:value];            }];          }];        }      });