1、push时，将tabar隐藏，方法1，在push之前，加入如下代码:
-(IBAction)btnOnClicked:(id)sender
{
SQVideoListViewController *videoListViewController = [[[SQVideoListViewController alloc]init]autorelease];
videoListViewController.type = [sender tag];
self.hidesBottomBarWhenPushed = YES; //用于隐藏tabBar
[self.navigationController pushViewController:videoListViewController animated:YES];
self.hidesBottomBarWhenPushed = NO;
}
方法二,在需要隐藏的controller中添加：
self.tabBarController.tabBar.hidden = YES;