UISwitch With Thumb Image

ImageSwitch.swift

import UIKit

class ImageSwitch: UISwitch {
    
    @IBInspectable var thumbImage: UIImage? {
        didSet {
            updateView()
        }
    }
    
    var thumbSize = CGSize.zero
    var onPoint = CGPoint.zero
    var offPoint = CGPoint.zero
    var imageView: UIImageView?
    
    
    func updateView() {
        if let thumbImage = thumbImage {
            imageView = UIImageView(image: thumbImage)
            imageView?.backgroundColor = .white
            imageView?.contentMode = .center
            thumbSize = CGSize(width: self.bounds.size.height - 2, height: self.bounds.height - 2)
            let yPostition = (self.bounds.size.height - thumbSize.height) / 2
            onPoint = CGPoint(x: self.bounds.size.width - thumbSize.width - 1, y: yPostition)
            offPoint = CGPoint(x: 1, y: yPostition)
            imageView?.frame = CGRect(origin: offPoint, size: thumbSize)
            imageView?.layer.cornerRadius = thumbSize.height * 0.5
            self.addSubview(imageView ?? UIImageView(image: thumbImage))
        }
    }
    
    func updateThumbPosition() {
        DispatchQueue.main.async {
            self.imageView?.frame = CGRect(origin: self.isOn ? self.onPoint : self.offPoint, size: self.thumbSize)
        }
    }
}