Dead Simple HUD implementation in swift with a title and an Acitivity indicator

HUD.swift

import UIKit

class HUD: UIView {
    private lazy var backView: UIView = UIView(frame: bounds)

    private let activityIndicator: UIActivityIndicatorView = UIActivityIndicatorView(style: .whiteLarge)

    private lazy var titleLabel: UILabel = {
        let title = UILabel()
        title.font = UIFont.boldSystemFont(ofSize: 16)
        title.textColor = headerColor
        title.textAlignment = .center
        return title
    }()

    private var headerColor = UIColor.white
    private var backColor = UIColor.black
    private var loaderColor = UIColor.white

    // MARK: Public Methods

    public static func showInView(_ view: UIView, title: String? = nil) {
        hideInView(view) // prevents adding more than one
        guard let window = view.window else {
            return
        }
        DispatchQueue.main.async {
            let hud = HUD()
            hud.frame = UIScreen.main.bounds
            hud.setupOverlay()
            hud.setupActivityIndicator()
            if let title = title {
                hud.setupTitle(text: title)
            }
            window.addSubview(hud)
        }
    }

    // Removes all HUDs from the window
    public static func hideInView(_ view: UIView) {
        guard let window = view.window else {
            return
        }
        DispatchQueue.main.async {
            window.subviews
                .filter({ $0 is HUD })
                .forEach({ $0.removeFromSuperview() })
        }
    }

    // MARK: - Set view properties

    private func setupOverlay() {
        if let old = backView.viewWithTag(1001) as UIView? {
            old.removeFromSuperview()
        }
        let translucentView = UIView(frame: backView.bounds)
        translucentView.backgroundColor = backColor
        translucentView.alpha = 0.75
        translucentView.tag = 1001
        backView.addSubview(translucentView)
        addSubview(backView)
    }

    private func setupActivityIndicator() {
        activityIndicator.style = .whiteLarge
        activityIndicator.color = loaderColor
        activityIndicator.backgroundColor = UIColor.clear
        activityIndicator.startAnimating()
        activityIndicator.center = center
        addSubview(activityIndicator)
    }

    private func setupTitle(text: String) {
        titleLabel.text = text
        titleLabel.sizeToFit()
        titleLabel.adjustsFontSizeToFitWidth = true
        let xPos = bounds.midX - titleLabel.bounds.midX
        let yPos = activityIndicator.frame.maxY + 5
        titleLabel.frame.origin = CGPoint(x: xPos, y: yPos)
        addSubview(titleLabel)
    }
}