Presenting one ViewController over another partially - ios

Question

I have a MapViewController that is basically a MKMapView and presents a map with custom annotations.
Right now I am trying to present another ViewController from the bottom containing additional filters that the user will be able to use on his journey.
However I ran into a problem, when I am presenting the new FilterMenuViewController as a child of MapViewController the MapViewController disappears.
This is what it looks like:
Initial state
Button to present new controller tapped
New controller presented but the MapViewController disappearing
The code that takes care of the interaction is as follows:
MapViewController variables declaration:
var filterMenuVC = FilterMenuViewController()
var isFilterMenuOpened = false
MapViewController viewDidLoad():
filterMenuVC = storyboard?.instantiateViewController(withIdentifier: "FilterMenuViewController") as! FilterMenuViewController
MapViewController showFilterMenu button action:
#IBAction func showFilterMenu(_ sender: UIButton) {
// Presents the filter menu
if isFilterMenuOpened == true {
isFilterMenuOpened = false
filterMenuVC.willMove(toParentViewController: nil)
filterMenuVC.view.removeFromSuperview()
filterMenuVC.removeFromParentViewController()
} else if isFilterMenuOpened == false {
isFilterMenuOpened = true
self.addChildViewController(filterMenuVC)
self.view.addSubview(filterMenuVC.view)
filterMenuVC.didMove(toParentViewController: self)
}
}

Answer 1

Try this, the view shows from top and reverse, here is the image: https://imgur.com/a/gzIGjEa
if isFilterMenuOpened{
if let searching = self.childViewControllers.first as? ViewController{
UIView.animate(withDuration: 0.7, animations: {
searching.view.frame = CGRect.init(x: 0,
y: self.view.frame.origin.y-308,
width: self.view.frame.size.width,
height: 308)
}, completion: {(boos) in
searching.removeFromParentViewController()
searching.dismiss(animated: true, completion: nil)
self.isFilterMenuOpened = false
})
}
}else{
let search = self.storyboard?.instantiateViewController(withIdentifier: "searchView") as! ViewController
search.view.frame = CGRect.init(x: 0, y: self.view.frame.origin.y-308, width: self.view.frame.size.width, height: 308) //The View controller height same size of your view in storyboard
search.delegateSearch = self
self.addChildViewController(search)
UIView.animate(withDuration: 0.5, animations: {
search.view.frame = CGRect.init(x: 0, y: self.view.frame.origin.y, width: self.view.frame.size.width, height: 308)
})
self.view.addSubview(search.view)
self.didMove(toParentViewController: search)
isFilterMenuOpened = true
}

Answer 2

The problem was that I created a segue "show" from the button to the ViewController which conflicted with adding the controller to the current view, it pushed into it instead and the MapViewController got deallocated.
So I just deleted the segue from sotryboard and added the child programatically, it works like charm now.
Was a stupid mistake, but maybe this will help someone who runs into the same problem :)