Custom TabBar layout for UITabBarViewController - ios

Question

Please refer to this Answer.
I am trying to do the same thing, however I want to do this in a Tab Bar App where the Now Playing bar is above the Tab Bar in all the scenes of the app.
Update:
I want to have a view at the bottom of the screen (above the tab bar) and under the content views of the different tabs (not above them). In addition, I want to have the ability to remove this view at a certain point making the main view take the whole screen.
I can do this using the mentioned Answer by changing the constraints of the nowPlaying view programmatically.

Answer 1

Using UITabBarViewController subclass it is possible:
Ex:
class DashBoardViewController: UITabBarController {
let nowPlayingBar:UIView = {
let view = UIView(frame: .zero)
view.backgroundColor = .blue
return view
}()
override func viewDidLoad() {
super.viewDidLoad()
initView()
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
nowPlayingBar.frame = tabBar.frame
}
override func viewDidAppear(_ animated: Bool) {
var newSafeArea = UIEdgeInsets()
// Adjust the safe area to accommodate
// the height of the bottom views.
newSafeArea.bottom += nowPlayingBar.bounds.size.height
// Adjust the safe area insets of the
// embedded child view controller.
self.childViewControllers.forEach({$0.additionalSafeAreaInsets = newSafeArea})
}
private func initView() {
nowPlayingBar.frame = tabBar.frame
view.addSubview(nowPlayingBar)
}
}

Answer 2

You'll add your view/container to your app window, you'd do something like
guard let window = (UIApplication.shared.delegate as? AppDelegate)?.window
else { return } // check if there's a window
let containerHeight: CGFloat = 50 // height for the view where you wish to add the music player
let containerFrame = CGRect(x:0, y: window.frame.maxY - (tabBar.frame.height + containerHeight), width: window.frame.width, height: containerHeight)
// most important part here is the y axis in some sense, you will add the height of the tabBar and the container, then subtract it from window.frame.maxY
let container = UIView(frame: containerFrame)
// now you have the container do whatever you want with it
window.addSubView(container) // finally add the container to window as a subview