"targets" approach

SwipeNavigationController.swift

import UIKit

class SwipeNavigationController: UINavigationController, UIGestureRecognizerDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()
        setupFullScreenSwipeBack()
    }

    private func setupFullScreenSwipeBack() {
        guard let interactivePopGestureRecognizer = interactivePopGestureRecognizer,
              let targets = interactivePopGestureRecognizer.value(forKey: "targets") as? [AnyObject] else { return }

        let panGesture = UIPanGestureRecognizer()
        panGesture.setValue(targets, forKey: "targets")
        panGesture.delegate = self
        view.addGestureRecognizer(panGesture)

        /// Disable the default edge-only gesture
        interactivePopGestureRecognizer.isEnabled = false
    }

    func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
        guard viewControllers.count > 1 else { return false }
        
        if let panGesture = gestureRecognizer as? UIPanGestureRecognizer {
            let velocity = panGesture.velocity(in: view)
            /// Only trigger on horizontal swipe to right
            let isHorizonralSwipeToRight = velocity.x > 0 && abs(velocity.x) > abs(velocity.y)
            if isHorizonralSwipeToRight {
                if viewControllers.last is SleepRecordDetailsViewController &&
                   TransitionManager.shared.appHasUnsavedRecordChanges {
                    TransitionManager.shared.goFromRecordDetailsToMain()
                    return false
                }
            }
            return isHorizonralSwipeToRight
        }

        return true
    }
}