ios – UISwipeGestureRecognizer Not Triggering Persistently on a Customized UIView with Blur Impact

I am constructing a customized notification system for my iOS app the place short-term notification views are displayed on prime of the display. These views have a layered construction with a UIVisualEffectView for a blur impact and a content material view containing icons and textual content.

I would like customers to dismiss the notification by swiping down. I’ve efficiently discovered that the swipe gestures are being added to the views, however by some means, the swipes aren’t being detected, not even faucets or pan gestures.

The swipe gesture typically fails to set off persistently. Beneath is the related code:

class NotificationViewController: UIViewController, UIGestureRecognizerDelegate {
    override func viewDidLoad() {
        tremendous.viewDidLoad()
        view.backgroundColor = .white
        
        // Present a notification after 1 second
        DispatchQueue.essential.asyncAfter(deadline: .now() + 1.0) {
            self.showNotification(message: "Swipe right down to dismiss!")
        }
    }
    
    func showNotification(message: String) {
        let notificationView = createNotificationView(message: message)
        view.addSubview(notificationView)
        positionNotification(notificationView, above: nil)
        
        // Robotically dismiss after 3 seconds
        DispatchQueue.essential.asyncAfter(deadline: .now() + 3.0) {
            self.dismissNotification(notificationView)
        }
    }
    
    personal func createNotificationView(message: String) -> UIView {
        // Create the notification view
        let notificationView = UIView()
        notificationView.backgroundColor = .clear
        notificationView.layer.cornerRadius = 12
        notificationView.layer.borderWidth = 1
        notificationView.layer.borderColor = UIColor.darkGray.cgColor
        notificationView.translatesAutoresizingMaskIntoConstraints = false
        notificationView.isUserInteractionEnabled = true
        
        // Add blur impact
        let blurEffect = UIBlurEffect(type: .systemChromeMaterial)
        let blurEffectView = UIVisualEffectView(impact: blurEffect)
        blurEffectView.body = notificationView.bounds
        blurEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        blurEffectView.isUserInteractionEnabled = false
        notificationView.addSubview(blurEffectView)
        
        // Add content material to the blur impact view
        let label = UILabel()
        label.textual content = message
        label.textColor = .label
        label.textAlignment = .heart
        label.translatesAutoresizingMaskIntoConstraints = false
        blurEffectView.contentView.addSubview(label)
        NSLayoutConstraint.activate([
            label.centerXAnchor.constraint(equalTo: blurEffectView.contentView.centerXAnchor),
            label.centerYAnchor.constraint(equalTo: blurEffectView.contentView.centerYAnchor)
        ])
        
        // Add swipe gesture recognizer
        let swipeGesture = UISwipeGestureRecognizer(goal: self, motion: #selector(handleSwipe(_:)))
        swipeGesture.path = .down
        swipeGesture.delegate = self
        notificationView.addGestureRecognizer(swipeGesture)  
      
        return notificationView
    }
    
    personal func positionNotification(_ notificationView: UIView, above previousNotificationView: UIView?) {
        notificationView.translatesAutoresizingMaskIntoConstraints = false
        if let previousView = previousNotificationView {
            NSLayoutConstraint.activate([
                notificationView.bottomAnchor.constraint(equalTo: previousView.topAnchor, constant: -10),
                notificationView.centerXAnchor.constraint(equalTo: view.centerXAnchor),
                notificationView.widthAnchor.constraint(equalTo: view.widthAnchor, multiplier: 0.9),
                notificationView.heightAnchor.constraint(equalToConstant: 60)
            ])
        } else {
            NSLayoutConstraint.activate([
                notificationView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 60),
                notificationView.centerXAnchor.constraint(equalTo: view.centerXAnchor),
                notificationView.widthAnchor.constraint(equalTo: view.widthAnchor, multiplier: 0.9),
                notificationView.heightAnchor.constraint(equalToConstant: 60)
            ])
        }
    }
    
    @objc personal func handleSwipe(_ gesture: UISwipeGestureRecognizer) {
        guard let notificationView = gesture.view else { return }
        print("Swipe detected on notification!")
        dismissNotification(notificationView)
    }
    
    personal func dismissNotification(_ notificationView: UIView) {
        UIView.animate(withDuration: 0.3, animations: {
            notificationView.alpha = 0
        }) { _ in
            notificationView.removeFromSuperview()
        }
    }

}

Similar strategy has been working for different views, however they had been declared on the mum or dad class degree, whereas this “notification view” is one thing that’s initialized inside a perform, however the values and every little thing else works effectively. This could have labored, so I’m not positive what I’m lacking.

Would love some recommendation.