MBProgressHUD *hud = [[MBProgressHUD alloc] initWithView:self.navigationController.view];            [self.navigationController.view addSubview:hud];            hud.labelText = @"正在清除缓存....";            __weak typeof (self)weakSelf = self;            [hud showAnimated:YES whileExecutingBlock:^{                // 模拟删除 要时间                sleep(1.0);            } completionBlock:^{//                [[NSNotificationCenter defaultCenter] postNotificationName:@"CLEARHISTORYTABLE" object:nil];                [hud removeFromSuperview];                NSString *clearCacheName =  [weakSelf clearTmpPics];                [JZGProgressHUD showInfoWithText:@"清理成功" toView:self.view];                weakSelf.cacheLabel.text = clearCacheName;                [weakSelf.tableView reloadRowsAtIndexPaths:[NSArray arrayWithObjects:[NSIndexPath indexPathForRow:3 inSection:0], nil] withRowAnimation:UITableViewRowAnimationNone];            }];