Reproducing Popular iOS Controls - Part 29: | Ray Wenderlich Videos

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I tried out what I mentioned above to make sure it would work for our needs, and it does. Here are the implementation details:

Add a new PSPDFTouchForwardingView class to your project.

import UIKit

// This class allows the "presentedController" to receive touches
// https://pspdfkit.com/blog/2015/presentation-controllers/
final class PSPDFTouchForwardingView: UIView {
  
  final var passthroughViews: [UIView] = []
  
  override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
    guard let hitView = super.hitTest(point, with: event) else { return nil }
    guard hitView == self else { return hitView }
    
    for passthroughView in passthroughViews {
      let point = convert(point, to: passthroughView)
      if let passthroughHitView = passthroughView.hitTest(point, with: event) {
        return passthroughHitView
      }
    }
    
    return self
  }
}

Add a new touchForwardingView var to the DraggablePresentationController:

private lazy var touchForwardingView: PSPDFTouchForwardingView? = {
    guard let containerView = containerView else { return nil }
    return PSPDFTouchForwardingView(frame: containerView.bounds)
  }()

Then change the presentationTransitionWillBegin method to look like this where you add the touchForwardingView at index 0 of the containerView:

override func presentationTransitionWillBegin() {
    guard let containerView = containerView else { return }
    
    touchForwardingView!.passthroughViews = [presentingViewController.view]
    containerView.insertSubview(touchForwardingView!, at: 0)
    
    containerView.insertSubview(dimmingView, at: 1)
    dimmingView.alpha = 0
    dimmingView.backgroundColor = .black
    dimmingView.frame = containerView.frame
  }
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