Swift - get size of viewController with navigation bar and tab bar

Question

my viewController has both navigation and tab bars. I need to figure out available space after subtracting size of navigation and tab bar. I tried:

let height = UIScreen.main.bounds.height - self.navigationController!.navigationBar.frame.size.height - self.tabBarController!.tabBar.frame.size.height

But it is not working... Am I doing something wrong?

EDITED: Sorry lacked information. I want to embed UIScroll view in between Navigation and Tab bar. The equation returned height that is bigger than available space.

titleView = UIScrollView(frame: CGRect(x: 0, y:0, width: titleWidth, height: height))

The titleView surpassed "tabbar.y"

Answer 1

The easiest way to get this information is using layout guides.

let viewHeight = view.frame.height - (topLayoutGuide.length + bottomLayoutGuide.length)

However, I think you're much better off using Autolayout to manage the height of your scrollView instead of setting in directly.

Answer 2

The solution was to also subtract height of statusBar. Damn..