UIView *tabBar = [self.tabBarController.view.subviews objectAtIndex:1];
tabBar.hidden = TRUE;
または、
self.tabBarController.tabBar.hidden = YES;
■参考記事
http://discussions.apple.com/thread.jspa?messageID=9959433
http://stackoverflow.com/questions/1164274/hiding-tabbar-when-rotating-iphone-device-to-landscape
タグ:iPhone