[Floating Action Button for iOS] #iOS

FAB.swift

    @IBOutlet weak var floatingActionButton: UIView! {
        didSet {
            floatingActionButton.layer.cornerRadius = floatingActionButton.width / 2.0
            floatingActionButton.layer.shadowOpacity = 0.8
            floatingActionButton.layer.shadowOffset = CGSize(width: 2.0, height: 2.0)
            floatingActionButton.layer.shadowColor = UIColor.darkGray.cgColor
        }
    }