Hiding UIButton(which added programatically) once view is hidden - ios

Question

Goal:
Hide a UIButton(w/ image) once a view is hidden.
I have a layout whereby the map view can be hidden when user taps(UITapGestureRecognizer) on the screen. When this happen, I would like to hide the "follow user button" triangle. Currently I am not able to do it.
What I've tried: (from multiple google/SO posts)
1)
followUserButton.removeFromSuperview()
followUserButton.widthAnchor.constraint(equalToConstant: 150).isActive = true
followUserButton.heightAnchor.constraint(equalToConstant: 150).isActive = true
followUserButton.setImage(image:nil for: .normal)
the last one I tried is basically just making the image black in color (to blend into the background). This does look like a success, but (see gif image), for some reason, the first click, will still show the button (very light black/grey - in the bottom middle of image). Click again, the map view comes on, then click again and it finally disappears
followUserButton.tintColor = .black
followUserButton.isHidden = true
this is how I'm adding my button programatically
var followUserImage: UIImage!
var followUserButton: UIButton!
override func viewDidLoad() {
setupFollowUserButton()
}
func setupFollowUserButton() {
addFollowUserButton()
self.view.addSubview(followUserButton)
constraintFollowUserButton()
}
func hideFollowUserButton() {
if vcTrainMapView.isHidden {
if followUserButton != nil {
// followUserButton.removeFromSuperview()
// followUserButton.tintColor = .black
followUserButton.isHidden = true
}
} else if followUserButton != nil {
followUserButton.tintColor = .lightGray
}
}
func addFollowUserButton() {
followUserButton = UIButton(type: UIButton.ButtonType.custom)
followUserImage = UIImage(named: "follow_user_high")
followUserButton.setImage(followUserImage, for:.selected)
followUserImage = (UIImage(named: "follow_user"))
followUserButton.setImage(followUserImage, for: .normal)
followUserButton.tintColor = .lightGray
followUserButton.addTarget(self, action: #selector(buttonAction(_:)), for: .touchUpInside)
}
#objc private func buttonAction(_ sender: UIButton) {
self.followUserStatus = !self.followUserStatus
sender.isSelected.toggle()
}
func constraintFollowUserButton() {
followUserButton.translatesAutoresizingMaskIntoConstraints = false
followUserButton.bottomAnchor.constraint(equalTo: vcTrainMapView.bottomAnchor, constant: -10).isActive = true
followUserButton.leadingAnchor.constraint(equalTo: vcTrainMapView.leadingAnchor, constant: 10).isActive = true
followUserButton.widthAnchor.constraint(equalToConstant: 50).isActive = true
followUserButton.heightAnchor.constraint(equalToConstant: 50).isActive = true
}
this is what I've achieved w/ #3 above. (the button is very light in the gif)

Answer 1

If you're going to be hiding and showing a button at the same time as a detail view (your map view), and you're displaying the button so that it looks like it's on that view, you could just add the button directly to that view rather than the view controller main view.
You can, of course, still control the action of the button from the view controller, but if it's added to the map view then the button will be hidden when the map view is hidden.