// 接口数据
NSString *stamp2 = [self getNowTimeTimestamp];
NSDictionary *para2 = @{@"pageNum":@0,@"userId":idString,@"signature":[Utils PHBMD5:stamp2],@"timestamp":stamp2};

    [DealWithData getDataWith:getVideoUrl withParameters:para2 complement:^(id data) {

        _dataArr = [data objectForKey:@"result"];

// NSLog(@"-------------------------%@",_dataArr);

        // 回到主线程刷新网格
        dispatch_async(dispatch_get_main_queue(), ^{
            
            [_mainCollectionView reloadData];
        });
    }];

• (NSString *)getNowTimeTimestamp{

  NSDate *datenow = [NSDate date];//现在时间,你可以输出来看下是什么格式
  NSString timeSp = [NSString stringWithFormat:@"%ld", (long)[datenow timeIntervalSince1970]1000];
  NSLog(@"-=======-%@",timeSp);

  return timeSp;
  }