UIView subclass that is transparent to all touch events besides those on eligible child views.

UIView+PassThrough.swift

import UIKit

/**
 UIView subclass that is transparent to all touch events besides those on eligible child views.
*/

class TKPassThroughView: UIView {
    
    // MARK - Touch Handling
    
    /**
     Override this point and determine if any of the subviews of our transparent view are the ones being tapped. If that is the case, handle those touches otherwise pass the touch through.
    */
    override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
        for subview in subviews as [UIView] {
            if !subview.isHidden && subview.alpha > 0 && subview.isUserInteractionEnabled && subview.point(inside: convert(point, to: subview), with: event) {
                return true
            }
        }
        return false
    }
}