UIButton loading indicator

UIButtonExtension.swift

extension UIButton {
    /// Unique number used to tag the loading indicator view
    private var loadingIndicatorTag: Int {
        808404
    }

    private var loadingIndicator: UIActivityIndicatorView? {
        viewWithTag(loadingIndicatorTag) as? UIActivityIndicatorView
    }

    func displayLoadingIndicator() {
        isEnabled = false
        alpha = 0.8
        let indicator = UIActivityIndicatorView(style: .medium)
        indicator.color = .white
        let buttonHeight = self.bounds.size.height
        let buttonWidth = self.bounds.size.width
        let titleLabelMaxX = titleLabel?.frame.maxX ?? 0
        indicator.center = CGPoint(x: titleLabelMaxX + (buttonWidth - titleLabelMaxX) / 2, y: buttonHeight / 2)
        indicator.tag = loadingIndicatorTag
        addSubview(indicator)
        indicator.startAnimating()
    }

    func hideLoadingIndicator() {
        isEnabled = true
        alpha = 1.0
        loadingIndicator?.stopAnimating()
        loadingIndicator?.removeFromSuperview()
    }
}