VirtualControllerView-Example.swift

let virtualControllerView = VirtualControllerView()
virtualControllerView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(virtualControllerView)
view.addConstraints([
    virtualControllerView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
    virtualControllerView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
    virtualControllerView.trailingAnchor.constraint(equalTo: view.trailingAnchor)
])
        
virtualControllerView.addAButton { _ in
    // used while user holds or when tapped (.touchDown)
} touchUpInside: { _ in
    // used when user lets go (.touchUpInside)
}