extension UIView {

    func show(animated: Bool) {
        self.isHidden = false
        if animated {
            UIView.animate(
                withDuration: animationDuration,
                animations: {
                    self.alpha = 1
                }
            )
        } else {
            self.alpha = 1
        }
    }

    func hide(animated: Bool) {
        if animated {
            UIView.animate(
                withDuration: animationDuration,
                animations: {
                    self.alpha = 0
                },
                completion: { _ in
                    self.isHidden = true
                }
            )
        } else {
            self.alpha = 0
            self.isHidden = true
        }
    }

}

fileprivate var animationDuration: TimeInterval = 0.3