How to hide/show tab bar of a view with a navigation bar in iOS?

I just created a category on UITabBarController that allows you to hide the TabBar, optionally with an animation:

https://github.com/idevsoftware/Cocoa-Touch-Additions/tree/master/UITabBarController_setHidden

It adds the tabBarHidden property (with isTabBarHidden as its getter) and the - (void)setTabBarHidden:(BOOL)hidden animated:(BOOL)animated method.

You can set the UIViewController.hidesBottomBarWhenPushed instead:

DetailViewController *detailViewController = [[DetailViewController alloc] init];
detailViewController.hidesBottomBarWhenPushed = YES;
[[self navigationController] pushViewController:detailViewController animated:YES];    
[detailViewController release];

Swift 3: Set tab bar to hide in viewWillAppear or viewDidAppear

self.tabBarController?.tabBar.isHidden = true

You can also do this in the Interface Builder for a storyboard. Select the View Controller that you want to hide the Tab Bar for and then select "Hide Bottom Bar on Push".