//1.设置self.tabBarController.tabBar.hidden=YES; self.tabBarController.tabBar.hidden=YES;
//2.如果在push跳转时需要隐藏tabBar，设置self.hidesBottomBarWhenPushed=YES; self.hidesBottomBarWhenPushed=YES;
NextViewController *next=[[NextViewController alloc]init];
[self.navigationController pushViewController:next animated:YES];
self.hidesBottomBarWhenPushed=NO;
//并在push后设置self.hidesBottomBarWhenPushed=NO;//这样back回来的时候，tabBar会恢复正常显示。原文网址：http://www.oschina.net/code/snippet_2429429_50263