Loading indicator for iOS

ViewControllerUtils.swift

//
//  ViewControllerUtils.swift
//  DesignMiami
//
//  Created by Daryl Lukas on 11/24/21.
//

import Foundation
import UIKit

class ViewControllerUtils {

    var container: UIView = UIView()
    var loadingView: UIView = UIView()
    var activityIndicator: UIActivityIndicatorView = UIActivityIndicatorView()

    /*
     Show customized activity indicator,
     actually add activity indicator to passing view

     @param uiView - add activity indicator to this view
     */
    func showActivityIndicator(uiView: UIView) {
        container.frame = uiView.frame
        container.center = uiView.center
        container.backgroundColor = UIColorFromHex(0xffffff, alpha: 0.5)

        loadingView.frame = CGRect(x: 0.0, y: 0.0, width: 80.0, height: 80.0)
        loadingView.center = uiView.center
        loadingView.backgroundColor = UIColorFromHex(0x444444, alpha: 0.7)
        loadingView.clipsToBounds = true
        loadingView.layer.cornerRadius = 10

        activityIndicator.frame = CGRect(x: 0, y: 0, width: 40.0, height: 40.0)
        activityIndicator.style = .large
        activityIndicator.color = .white
        activityIndicator.center = CGPoint(x: loadingView.frame.size.width / 2, y: loadingView.frame.size.height / 2)

        loadingView.addSubview(activityIndicator)
        container.addSubview(loadingView)
        uiView.addSubview(container)
        activityIndicator.startAnimating()
    }

    /*
     Hide activity indicator
     Actually remove activity indicator from its super view

     @param uiView - remove activity indicator from this view
     */
    func hideActivityIndicator(uiView: UIView) {
        activityIndicator.stopAnimating()
        activityIndicator.isHidden = true
        container.removeFromSuperview()
    }

    /*
     Define UIColor from hex value

     @param rgbValue - hex color value
     @param alpha - transparency level
     */
    func UIColorFromHex( _ rgbValue: UInt32, alpha: Double=1.0)->UIColor {
        let red = CGFloat((rgbValue & 0xFF0000) >> 16)/256.0
        let green = CGFloat((rgbValue & 0xFF00) >> 8)/256.0
        let blue = CGFloat(rgbValue & 0xFF)/256.0
        return UIColor(red:red, green:green, blue:blue, alpha:CGFloat(alpha))
    }
}