private func setupBackgroundImage() {
    backgroundImageView = UIImageView(frame: bounds)
    addSubview(backgroundImageView)
    backgroundImageView.contentMode = .scaleAspectFill
    backgroundImageView.clipsToBounds = true
    backgroundImageView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
}

private func setupGradient() {
    gradientView = GradientView(frame: CGRect(x: 0, y: bounds.height, width: bounds.width, height: -60.0))
    addSubview(gradientView)
    gradientView.gradientLayer.colors = [
        UIColor.black.withAlphaComponent(0.0).cgColor,
        UIColor.black.withAlphaComponent(0.7).cgColor
    ]
    gradientView.autoresizingMask = [.flexibleWidth, .flexibleTopMargin]
}

private func setupLabel() {
    label = UILabel(frame: CGRect.zero)
    addSubview(label)
    label.font = UIFont.boldSystemFont(ofSize: 24.0)
    label.textColor = .white
    label.translatesAutoresizingMaskIntoConstraints = false
    NSLayoutConstraint.activate(
        [
            label.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 16.0),
            label.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -16.0),
            label.bottomAnchor.constraint(equalTo: bottomAnchor, constant: -8.0)
        ]
    )
}