Tooltipview for button descirptions

TooltipView.swift

import UIKit
import Shared

class TooltipView: UIView {

    var message: String? {
        didSet { label.text = message }
    }

    var actionWithHide: (() -> Void)?

    let triangle: TriangleView = {
        $0.translatesAutoresizingMaskIntoConstraints = false
        $0.backgroundColor = .clear
        return $0
    }(TriangleView())

    let button: UIButton = {
        $0.translatesAutoresizingMaskIntoConstraints = false
        $0.backgroundColor = UIColor.mhk.basicBlue
        $0.layer.cornerRadius = 4
        $0.clipsToBounds = true
        $0.isUserInteractionEnabled = true
        return $0
    }(UIButton())

    let label: UILabel = {
        $0.translatesAutoresizingMaskIntoConstraints = false
        $0.sizeToFit()
        $0.textAlignment = .center
        $0.font = Font.SfCompactDisplay.regular.withSize(12)
        $0.textColor = .white
        $0.numberOfLines = 2
        $0.setContentCompressionResistancePriority(.required, for: .horizontal)
        return $0
    }(UILabel())

    let cancelImageView: UIImageView = {
        $0.translatesAutoresizingMaskIntoConstraints = false
        $0.image = UIImage(named: "tooltipCancel")
        $0.contentMode = .scaleAspectFit
        return $0
    }(UIImageView())

    override init(frame: CGRect) {
        super.init(frame: frame)
        layout()
        button.addTarget(self, action: #selector(contentViewTapped), for: .touchUpInside)
        button.add(haptic: .impact(.light))
    }

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

    private func layout() {
        backgroundColor = .clear

        addSubview(triangle)
        addSubview(button)
        button.addSubview(label)
        button.addSubview(cancelImageView)

        NSLayoutConstraint.activate([
            triangle.topAnchor.constraint(equalTo: topAnchor),
            triangle.heightAnchor.constraint(equalToConstant: 8),
            triangle.widthAnchor.constraint(equalToConstant: 8),

            button.topAnchor.constraint(equalTo: triangle.bottomAnchor),
            button.heightAnchor.constraint(equalToConstant: 41),
            button.leftAnchor.constraint(equalTo: leftAnchor),
            button.rightAnchor.constraint(equalTo: rightAnchor),

            label.centerYAnchor.constraint(equalTo: button.centerYAnchor),
            label.rightAnchor.constraint(equalTo: cancelImageView.rightAnchor, constant: -15),
            label.leftAnchor.constraint(equalTo: button.leftAnchor, constant: 20),

            cancelImageView.widthAnchor.constraint(equalToConstant: 7),
            cancelImageView.heightAnchor.constraint(equalToConstant: 7),
            cancelImageView.topAnchor.constraint(equalTo: label.topAnchor),
            cancelImageView.rightAnchor.constraint(equalTo: rightAnchor, constant: -9)
        ])
    }

    func show(superView: UIView, toBottomView: UIView, tailCenterXAnchor: NSLayoutXAxisAnchor? = nil) {
        removeFromSuperview()
        superView.addSubview(self)

        let centerAutoLayout = centerXAnchor.constraint(equalTo: toBottomView.centerXAnchor)
        centerAutoLayout.priority = .defaultLow
        centerAutoLayout.isActive = true

        let rightAutoLayout = rightAnchor.constraint(lessThanOrEqualTo: superView.rightAnchor, constant: -15)
        rightAutoLayout.priority = .required
        rightAutoLayout.isActive = true

        topAnchor.constraint(equalTo: toBottomView.bottomAnchor).isActive = true

        if let centerXAnchor = tailCenterXAnchor {
            triangle.centerXAnchor.constraint(equalTo: centerXAnchor).isActive = true
        } else {
            triangle.centerXAnchor.constraint(equalTo: centerXAnchor).isActive = true
        }
    }

    func hide() {
        UIView.transition(
            with: self,
            duration: 0.3,
            options: .curveEaseIn,
            animations: { [weak self] in self?.alpha = .zero },
            completion: { [weak self] _ in
                self?.removeFromSuperview()
        })
        actionWithHide?()
    }

    @objc
    func contentViewTapped() {
        hide()
    }

    class TriangleView: UIView {

        override func draw(_ rect: CGRect) {
            guard let context = UIGraphicsGetCurrentContext() else { return }
            context.beginPath()
            context.move(to: CGPoint(x: rect.midX, y: rect.minY))
            context.addLine(to: CGPoint(x: rect.minX, y: rect.maxY))
            context.addLine(to: CGPoint(x: rect.maxX, y: rect.maxY))
            context.closePath()
            context.setFillColor(UIColor.mhk.basicBlue.cgColor)
            context.fillPath()
        }
    }
}