BlurrBackgroundButton.swift

public final class BlurryBackgroundButton: UIControl {

    public init() {
        super.init(frame: .zero)
        setup()
    }

    public override init(frame: CGRect) {
        super.init(frame: frame)
        setup()
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    private func setup() {
        backgroundColor = UIColor(white: 247/255, alpha: 0.8)
        layer.shadowColor = UIColor(white: 0, alpha: 1).cgColor
        layer.shadowOffset = CGSize(width: 0, height: 4)
        layer.shadowRadius = 8
        layer.shadowOpacity = 0.15
        layer.cornerRadius = 8

        stackView.layoutMargins = UIEdgeInsets(top: 12, left: 8, bottom: 12, right: 8)
        stackView.isLayoutMarginsRelativeArrangement = true

        add(view: blurView)
            .lockFrame(withView: self)
            .lockToCenter(ofView: self)

        add(view: stackView)
            .lockToCenter(ofView: self)
            .lockToHeight(ofView: self)

        addTarget(self, action: #selector(touchDown), for: [.touchDown, .touchDragEnter])
        addTarget(self, action: #selector(touchUp), for: [.touchUpInside, .touchDragExit, .touchCancel])
    }

    private lazy var blurView: UIVisualEffectView = {
        let blur = UIBlurEffect(style: .light)
        let view = UIVisualEffectView(effect: blur).forAutoLayout()
        view.layer.cornerRadius = 8
        view.layer.masksToBounds = true
        return view
    }()

    private lazy var stackView: UIStackView = .horizontalStackView(with: [imageView, titleLabel], spacing: 8)

    private lazy var imageView: UIImageView = {
        let image = Asset.Icons.editCalender.image.withRenderingMode(.alwaysTemplate)
        let imageView = UIImageView(image: image).forAutoLayout()
        imageView.tintColor = .black
        imageView.contentMode = .scaleAspectFit
        return imageView
    }()

    private lazy var titleLabel: UILabel = {
        let label = UILabel()
        label.text = "Start Date"
        label.font = UIFont(mealPlanFont: .demiBold, ofSize: 17)
        return label
    }()

    // MARK: Touch Handling

    private var animator = UIViewPropertyAnimator()

    @objc private func touchDown(sender: Any, forEvent: UIEvent) {
        animator.stopAnimation(true)
        transform = CGAffineTransform(scaleX: 0.9, y: 0.9)
        layer.shadowOffset = [0, 2]
        layer.shadowOpacity = 0.5
    }

    @objc private func touchUp() {
        animator = UIViewPropertyAnimator(duration: 0.3, curve: .easeInOut, animations: { [weak self] in
            self?.transform = .identity
            self?.layer.shadowOffset = [0, 4]
            self?.layer.shadowOpacity = 0.15
        })
    }

}