//隐藏

self.tableView.showsVerticalScrollIndicator = NO;

//修改颜色

self.tableView.indicatorStyle=UIScrollViewIndicatorStyleWhite;

//选中0组0行

NSIndexPath *selectedIndexPath = [NSIndexPath indexPathForRow:0 inSection:0];

[self.tableView selectRowAtIndexPath:selectedIndexPath animated:NO scrollPosition:UITableViewScrollPositionNone];