How can I add a swipe gesture to my side menu controller? - swift

Question

I made a side menu with some controls and I can dismiss it when the user taps outside of the side menu or if he/she selects a row inside the side menu. Now I want to add a swipe gesture to the left so that the user can dismiss it that way too.
extension MenuViewController {
#objc func dismissControllerAnimated() {
dismiss(animated: true, completion: nil)
} }
class SlideinTransition: NSObject, UIViewControllerAnimatedTransitioning {
let menuViewController = MenuViewController()
var isPresenting = true
let dimmingView = UIView()
func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
return 0.5
}
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
guard let toViewController = transitionContext.viewController(forKey: .to),
let fromViewController = transitionContext.viewController(forKey: .from) else { return }
let containerView = transitionContext.containerView
let finalWidth = toViewController.view.bounds.width * 0.3
let finalHeight = toViewController.view.bounds.height
if isPresenting{
//adds a tap gesture to our dimming view
let tapGesture = UITapGestureRecognizer(target: toViewController, action: #selector(MenuViewController.dismissControllerAnimated))
dimmingView.addGestureRecognizer(tapGesture)
//adds the dimming view
dimmingView.backgroundColor = .black
dimmingView.alpha = 0.0
containerView.addSubview(dimmingView)
dimmingView.frame = containerView.bounds
//adds the menu view controller to our container
containerView.addSubview(toViewController.view)
//init frame off the screen
toViewController.view.frame = CGRect(x: -finalWidth, y: 0, width: finalWidth, height: finalHeight)
}
let transform = {
self.dimmingView.alpha = 0.5
toViewController.view.transform = CGAffineTransform(translationX: finalWidth, y: 0)
}
//applies a specific kind of transformation to our view
let identity = {
self.dimmingView.alpha = 0.0
fromViewController.view.transform = .identity
}
//animates the transition and cancels it when you click outside of the frame
let duration = transitionDuration(using: transitionContext)
let isCancelled = transitionContext.transitionWasCancelled
UIView.animate(withDuration: duration, animations: {
self.isPresenting ? transform() : identity()
}) { (_) in
transitionContext.completeTransition(!isCancelled)
if !self.isPresenting {
self.dimmingView.removeFromSuperview()
}
}
}
}
I instantiate my "MenuViewController" like this into my MainController
#IBAction func didTapMenu(_ sender: UIBarButtonItem) {
guard let menuViewController = storyboard?.instantiateViewController(withIdentifier: "MenuViewController") as? MenuViewController else { return }
menuViewController.didTapMenuType = { menuType in
self.transitionToNew(menuType)
}
menuViewController.modalPresentationStyle = .overCurrentContext
menuViewController.transitioningDelegate = self
present(menuViewController, animated: true)
}
How can I add a SwipeGestureRecognizer to my transition? I appreciate every input. Thanks in advance!