Resize view to account for toolbar - ios

Question

If I create a basic ViewController and add an opaque UIToolbar to the view, like so:
UIViewController* viewController = [[UIViewController alloc] init];
[viewController.view setBackgroundColor:[UIColor blueColor]]; // To make it easy to see
self.window.rootViewController = viewController;
UIToolbar* toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, viewController.view.frame.size.height - 49, viewController.view.frame.size.width, 49)]; // At bottom. Height of 49
[toolbar setBarStyle:UIBarStyleBlack]; // Opaque and easy to see
[self.window.rootViewController.view addSubview:toolbar]; // Add toolbar to view controller
The view hierarchy ends up like below:
How do I make the View controller resize it's main area (the blue part) so it doesn't extend behind the UIToolbar?

Answer 1

Try to add this line of code
viewController.edgesForExtendedLayout = UIRectEdgeNone;
this will make so view controller's edges are not extended in any direction.
Or you can add this if you want to extend top, left and right, but not bottom.
viewController.edgesForExtendedLayout = UIRectEdgeTop, UIRectEdgeLeft, UIRectEdgeRight;

Answer 2

Try like this
UIViewController* viewController = [[UIViewController alloc] init];
[viewController.view setBackgroundColor:[UIColor blueColor]]; // To make it easy to see
self.window.rootViewController = viewController;
UIToolbar* toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, viewController.view.frame.size.height - 49, viewController.view.frame.size.width, 49)]; // At bottom. Height of 49
[toolbar setBarStyle:UIBarStyleBlack]; // Opaque and easy to see
SecondViewController* secondChildVC = [self.storyboard instantiateViewControllerWithIdentifier:#"someId"];
[secondChildVC.view setBackgroundColor:[UIColor redColor]];
[viewController addChildViewController:secondChildVC];
[secondChildVC didMoveToParentViewController:viewController];
secondChildVC.view.frame = CGRectMake(0,0,viewController.view.frame.size.width,viewController.view.frame.size.height - 49);
[viewController.view addSubview:secondChildVC.view];
[self.window.rootViewController.view addSubview:toolbar];